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Seawater circulation in the slurry TBM excavation chamber and its influence on the permeability of bentonite Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-29 Chenghao Zhang, Adam Bezuijen
When drilling with a slurry TBM (Tunneling Boring Machine) below the sea bottom, the fresh bentonite slurry will be mixed with the seawater and transformed into a salty bentonite slurry. This paper describes a theoretical study into the seawater circulation in the TBM excavation chamber and proposes a model to predict the amounts of seawater that may be mixed during tunneling and presents experimental
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Coupled hydro-thermal flow and radionuclide transport driven by spatial variation of heat-generating radioactive wastes in shale formations Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-28 Kyung Won Chang, Tara LaForce
Deep geologic disposal of multiple nuclear waste packages with various heat sources can induce nonuniform hydro-thermal behaviors in the near-field of the repository, consequently influencing the long-term radionuclide transport in the far-field once waste form breach initiates. This study looks into three cases with variation in the spatial order of six groups of heat sources (10th, 50th, 75th, 90th
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A novel sensor network based real-time automatic longitudinal ventilation smoke control system for tunnels: A numerical investigation Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-28 Yao Hong, Ceji Fu, Bart Merci
Longitudinal ventilation is widely used for smoke control in tunnel fires. This paper proposes and numerically investigates a novel ventilation scheme for tunnel smoke control that can automatically adjust its ventilation velocity in real time and in which the concepts of the Internet of Things (IoTs) and the Automatic Control (AC) are applied. Specifically, a sensor network and the PID (Proportio
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The influence of the nonlinear behaviour of connecting bolts on the shear stiffness of circular joints in a tunnel segmental lining Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-28 Xin Han, Pierpaolo Oreste, Fei Ye
The segmental lining is a very common type of lining of tunnels, which is adopted when the TBM (Tunnel Boring Machine) is used as an excavation machine. It has a very important static task, because it has to support the loads transmitted by the ground or rock around the tunnel.
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Ground settlement caused by perpendicularly crossing twin tunnels, a parametric study Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-23 Md Shariful Islam, Magued Iskander
A series of three-dimensional parametric finite element analyses were carried out to investigate the induced ground surface settlement during the excavation of perpendicularly under and above crossing twin tunnels. Both transverse and longitudinal settlements are investigated and presented in this study. The results suggest that the larger the cover depth, the wider the transverse settlement trough
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A dynamic modeling approach to predict water inflow during tunnel excavation in relatively uniform rock masses Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-23 Zhongxia Li, Jing Xiao, Junwei Wan, Jianmei Cheng, Haibo Feng, Hongbin Zhan, Shuai Yuan, Kun Huang
Karst landforms are widely distributed all over the world. With the continuous improvement of infrastructure construction, tunnelling in mountainous karst areas is inevitable. Due to the complex hydrogeological conditions in karst areas, groundwater inflow during tunnelling is usually difficult to predict and can cause huge economic losses and casualties. Therefore, finding better ways to improve the
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Concave performance evaluation of GFRP-reinforced precast concrete tunnel lining segments Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-22 Ahmed Elbady, Salaheldin Mousa, Hamdy M. Mohamed, Adel ElSafty, Brahim Benmokrane
This paper reports on an investigation into the behavior of GFRP-reinforced precast concrete tunnel lining (PCTL) segments loaded on the concave side subjected to transportation, storage, and settlement loads induced by soil settlement underneath tunnels and/or internal vehicular accidents. Shear tests were conducted on four full-scale PCTL segments with a rhomboidal shape measuring 1500 x 250 mm in
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Influence of tunnel slope on the one-dimensional spread of smoke transportation and temperature distribution in tunnel fires Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-22 Zihe Gao, Mingge Liu, Pengju Zhao, Changbin Yan
As a widely used fundamental transportation facility, tunnels always have a specific longitudinal slope, which may significantly affect smoke transportation, but the knowledge of smoke transportation in the sloped tunnel is relatively insufficient. In this work, a series of numerical simulations are performed to explore the influence of longitudinal slope on smoke transportation and temperature distribution
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A semi-Naïve Bayesian rock burst intensity prediction model based on average one-dependent estimator and incremental learning Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-22 Qinghe Zhang, Tianle Zheng, Liang Yuan, Xue Li, Weiguo Li, Xiaorui Wang
Rock burst is one of the common disasters in the field of engineering. The traditional rock burst prediction model assumes that the data distribution is fixed or stationary and that the training samples are independent and identically distributed. The model is prone to catastrophic forgetting problems during use. In this study, a Bayesian model with incremental learning (IL) properties based on the
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Numerical investigation on the effect of water leakage on the ground surface settlement and tunnel stability Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-21 Dohyun Park
Tunnel leakage can cause changes in stress and pore water pressure of the ground, which may affect tunnel stability and ground movement. Long-term or large-scale water leaks may cause adverse effects on tunnel stability and the surrounding ground environment, such as tunnel lining instability and surface settlement. In the present study, the water leakage-induced behavior of a tunnel and the surrounding
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Spatio-temporal prediction of deep excavation-induced ground settlement: A hybrid graphical network approach considering causality Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-21 Xiaojing Zhou, Yue Pan, Jianjun Qin, Jin-Jian Chen, Paolo Gardoni
With the increasing demand for deep and large-scale excavation pits, the deformation response during excavation has become exceedingly complex, especially located in building-intensive areas. This paper proposes a hybrid deep learning model named attention-causality-based graphical gated network (AC-GGN) to accurately make the spatio-temporal prediction about the excavation-induced ground settlement
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Reverse-time migration of GPR data for imaging cavities behind a reinforced shield tunnel Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-21 Hai Liu, Yunpeng Yue, Yunlong Lian, Xu Meng, Yanliang Du, Jie Cui
Ground penetrating radar (GPR) has been widely used for detecting cavities and other hidden defects behind reinforced shield tunnel linings. Migration can collapse diffractions and reconstruct the geometries of cavities behind the tunnel, thus aiding accurate interpretation of the GPR data. However, clutters from a segment joint could be misjudged as a cavity in the reconstructed GPR images. In this
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Research on the length of the anti-freezing layer of cold-region tunnels under the influence of train-induced wind Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-21 Yan Gao, Yunfei Ding, Yan Feng, Jingjing Xia, Xuezhi Tian, Jiying Geng, Benguo He
The difference between the temperature in a high-speed railway tunnel and that outside the tunnel narrows because of the train-induced wind, and the temperature field in the tunnel differs greatly from that in an ordinary tunnel. Negative temperature distribution occurs in the middle section of a tunnel when traffic density is high, which is detrimental to the anti-freezing design of tunnels in cold
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Study the maximum temperature of diffusion smoke downstream in a longitudinal ventilated branched tunnel with different transverse fire locations Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-21 Zhisheng Li, Yuchun Zhang, Yunji Gao, Longfei Chen, Tao Li
Previous studies have not focused on the effect of longitudinal ventilation on the temperature field with different transverse fire source locations in a branched tunnel fire. The maximum temperature under the ceiling is crucial for evaluating the thermal hazard of a tunnel fire. In this study, a series of reduced-scale branched tunnel fire experiments were conducted to examine the maximum excess temperature
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Seismic performance of segmented tunnel in water-saturated poroelastic soil using a novel fluid–solid coupling FEM based on Biot theory Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 Jiali Liang, Hai Zhang, Zhongxian Liu, Jianwen Liang
To fill the gap that the impact of segmental joints and water-saturated soil is commonly considered separately in the existing research, this paper proposes a fluid–solid coupling FEM to examine the seismic behaviour of an underwater segmented tunnel, considering the weakening effect of the joints and the dynamic characteristics of the two-phase media simultaneously, with different input ground motions
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Optimal earthquake intensity measure in probabilistic seismic demand models of underground subway station structure Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 Jiawei Jiang, Wenbiao Li, M. Hesham El Naggar, Yazhi Zhao, Guoxing Chen, Xiuli Du
This paper investigates the optimal intensity measure (IM) for underground structure in probabilistic seismic demand models. A two-dimensional finite element model that accounts for the soil-structure interaction for a subway station was established employing the program ABAQUS. Probabilistic seismic demand analysis was conducted based on the cloud method, which involved 248 non-linear dynamical analyses
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Evacuation performance of individuals and social groups in a tunnel under no visibility Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 Guang Zeng, Zhiyuan Li, Rui Ye, Shuchao Cao
When fire occurs in a road tunnel, the rapid spread of smoke results in limited visibility for crowds, making it difficult for them to evacuate quickly. Meanwhile, pedestrians generally evacuate in groups due to their existing social relationships. However, the influence mechanism of group behavior on evacuation dynamics under poor visibilities in tunnels is still unclear. To study the evacuation performance
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Experimental investigation on rheological properties and diffusion-related performance of clay shock slurry for excavation gap filling during shield tunnelling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 Kangjian Zhang, Zhiqiang Zhang, Hao Chen, Zhechuan Hu
The clay shock method is used to fill the excavation gap caused by shield taper and deviation during shield tunnelling. The rheological properties and diffusion-related performance of clay shock (CS) slurry have an important influence on its ability. In this study, the authors tested the rheological properties of CS slurry by using a rotational viscometer with a stepless regulation in speed. The influence
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Laboratory testing of settlement propagation induced by pipe-roof pre-support deformation in sandy soils Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 Bo Lu, Brian B. Sheil, Wen Zhao, Pengjiao Jia, Qian Bai, Wentao Wang
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Failure analysis of circumferential joints and preferable bolt form of shield tunnel under normal fault dislocation Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 Qi Wang, Ping Geng, Peisong Li, Dingwei He, Huoming Shen
Due to evidence that active-fault tunnels can result in structural damage, a three-dimensional numerical model of a shield tunnel spanning a normal fault was developed by employing the Qingdao Jiaozhou Bay Second Subsea Tunnel in order to examine the structural response and failure characteristics of the shield tunnel while taking into account the segment width and the bolt form of the circumferential
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Predictive machine learning in earth pressure balanced tunnelling for main drive torque estimation of tunnel boring machines Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-20 K. Glab, G. Wehrmeyer, M. Thewes, W. Broere
Designing the main drive motor capacity of Earth Pressure Balanced Tunnel Boring Machines (EPB TBMs) is a crucial task for every EPB tunnelling project. The machine needs to be equipped with sufficient power to master the geotechnical conditions of the respective project. On the other hand, overpowering the machine should be avoided for economic and sustainability reasons. Main drive torque estimation
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Building Information Modeling in the execution phase of conventional tunneling projects Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-19 Marco Huymajer, Oleksandr Melnyk, Robert Wenighofer, Christian Huemer, Robert Galler
Building Information Modeling (BIM) has become the key technology for the digital transformation of the architecture, engineering, and construction (AEC) sector. The Industry Foundation Classes (IFC), as an open and vendor-neutral data model, play an essential role in this transformation. Despite all the recent advances of BIM, tunneling needs to catch up with other AEC sectors adopting digital technologies
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LSTM-based deformation forecasting for additional stress estimation of existing tunnel structure induced by adjacent shield tunneling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-19 Xiao-Wei Ye, Si-Yuan Ma, Zhi-Xiong Liu, Yan-Bo Chen, Ci-Rong Lu, Yue-Jun Song, Xiao-Jun Li, Li-An Zhao
A redistribution of stress is caused by the excavation of a new tunnel within the soil surrounding the existing shield tunnel structure. This stress redistribution results in alterations to the soil and water loads around the existing tunnel structure, ultimately impacting its stress and deformation. The deformation response of existing tunnels is primarily focused on in most existing studies, with
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Rheological characterization of the conditioned sandy soil under gas-loading pressure for earth pressure balance shield tunnelling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-19 Zeen Wan, Shuchen Li, Shisen Zhao, Richeng Liu
Soil conditioning technology is usually required to modify the excavated soil to a fluid plastic state during the construction with earth pressure balance (EPB) shield. The steady pressure distribution in the excavation face is linked to soil fluidity. Compared with the slump test, the rheological behavior of the conditioned soil can better reflect the dynamic flow characteristics. A gas-loading rotational
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Application of built-in microphone of smartphone for inspecting unbonded length of fully grouted rock bolt Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-16 Jong-Sub Lee, Jung-Doung Yu
This study aimed to inspect the unbonded length of a rock bolt using the built-in microphone of a smartphone. An experimental study was conducted using rock bolts of different unbonded lengths. Sound waves were produced by impacting the head of the rock bolt, and the reverberation of the sound waves in the unbonded section was recorded. To compensate for the phase difference between the two signals
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Damage analysis of buried pipelines subjected to side-by-side twin tunneling based on centrifuge and numerical modeling Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-16 Wei Sun, Enpeng Lin, Zhiqiang Yang, Pengpeng Ni, Yu Chen
Twin tunnel excavations can seriously affect the integrity of buried pipelines. In this investigation, centrifuge model tests and numerical simulations were carried out to study the brittle damage of buried pipelines induced by side-by-side twin tunneling. In the numerical model, the pipelines were simulated as peridynamics (PD) shell structures, the surrounding soil was represented as a series of
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Impact of bedding layers to soil-pipe-liner structure under static and traffic loads with EPR technology Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-16 Yahong Zhao, Yang Chen, Xuefeng Yan, Peng Ma, Haifeng Zhang, Baosong Ma, Sheng Huang
Bedding layer refers to a layer of material that is placed under and around a pipe to provide support and prevent damage to the pipe. The impact of the bedding layer can be evaluated based on various bedding factors. However, current pipe design methods only evaluate the impact of bedding layers under static and traffic load. Isolating the effects of traffic loads for separate analysis is not possible
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Study on the combination effect of tunnel slope and longitudinal fire location on the asymmetric flow fields in a naturally ventilated tunnel Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-16 Longxing Yu, Xiwen Lei, Ping Huang, Chunxiang Liu, Hao Zhang, Fuqiang Yang
CFD simulation tests were carried out to study the asymmetric flow phenomenon caused by the combination effect of tunnel slope and longitudinal fire location in a naturally ventilated tunnel. The result shows that the tunnel slope and the longitudinal fire location can both create the induced longitudinal flow solely. The longitudinal flow within tunnel induced by the stack effect caused by the tunnel
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Unified optimization-based analysis of GPR hyperbolic fitting models Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-15 Wenchao He, Wallace Wai-Lok Lai
Ground Penetrating Radar (GPR) is a valuable tool for exploring underground spaces, particularly for detecting cylindrical objects such as pipelines and rebar, where data often forms hyperbolic pattern. The technique of hyperbola fitting is a commonly used approach for extracting information from these data. However, the existing literature has not thoroughly examined how different parameters - such
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Study the anisotropic behavior of layered surrounding rock based on 3D FDEM method Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-13 Chenglei Du, Quansheng Liu, Yiming Lei, He Liu, You Lu, Haitao Jiang, Shouming Xiang, Yunhe Yang
The anisotropic behavior of layered surrounding rock has always been a hot topic in underground engineering. This paper aims to investigate the deformation characteristics and crack evolution process of layered surrounding rock under excavation unloading conditions using the three-dimensional (3D) FDEM method. Firstly, the principle of 3D FDEM method is briefly introduced, and the transversely isotropic
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Toward the automation of mechanized tunneling “exploring the use of big data analytics for ground forecast in TBM tunnels” Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-13 Saadeldin Mostafa, Rita L. Sousa, Herbert H. Einstein
Automation of construction machines has grown rapidly in recent years as a response to the need to increase productivity, increase construction safety, decrease costs, and overcome the lack of availability of qualified labor. However, tunnel automation still lags. Automation of mechanized tunneling is essential to the future of tunneling construction, as the current practice still relies heavily on
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Optimizing fire emergency evacuation routes in underground coal mines: A lightweight network flow approach Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-09 Simon Lotero, Vasilis Androulakis, Hassan Khaniani, Mostafa Hassanalian, Sihua Shao, Pedram Roghanchi
In underground mine fires, the presence of smoke, toxic gasses, and high heat can significantly hinder the evacuees from identifying the optimal path to safety. This study presents a framework that couples a mine fire simulator software with a Ford-Fulkerson algorithm to model fire evacuations as a minimum-cost flow problem. The fire-induced risks are quantified based on the MSHA safety standards and
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Vibration analysis of rock breaking by TBM rolling cutter assisted with various depth kerfs Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-09 Hongyi Xu, Qiuming Gong, Xiaoxiong Zhou, Fengwei Yang, Bei Han
Kerfing on the tunnel working face is one of effective ways to promote the performance of tunnel boring machines (TBMs) in hard rock masses, since the rock mass integrity is reduced. When TBM cutter cuts along the midline of two kerfs, the lateral cracks generated from the cutter tip could propagate to the bottom of adjacent kerfs, thus improving the cutting efficiency. However, the cutter vibration
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Seismic fragility and resilience assessment of shallowly buried large-section underground civil defense structure in soft soils: Framework and application Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-08 Zhongkai Huang, Yixin Cheng, Dongmei Zhang, Dengfei Yan, Yiyao Shen
The assessment of fragility of underground civil defense structures is of paramount importance in ensuring their functionality and enhancing safety in seismic-prone regions. This study aims to explore the evolution law of seismic fragility for a shallowly buried large-section underground civil defense structure in soft soils, employing advanced data-based approaches. To achieve this, a two-dimensional
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Evaluation model of circular tunnel lining subjected to dislocation earthquake point source in semi-infinite media Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-08 Pingliang Chen, Ping Geng, Dingwei He, Junbo Chen, Chenyang Xiang, Chuan He
Earthquakes are generated by fault dislocations, propagates outward in the form of seismic waves in the stratum, and cause the mechanical response of the tunnel lining. In this paper, an evaluation model of circular tunnel lining under the action of dislocation earthquake point source in semi-infinite space is proposed, which describes the effect of the earthquake point source on the tunnels. First
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Investigating the dynamic response of a double-box utility tunnel buried in calcareous sand against ground surface explosion Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-08 Yahao Pan, Zhouhong Zong, Jun Li, Haimin Qian, Chengqing Wu
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Experimental study on obstacle visibility and driving safety in lighting environment of road tunnel interior zone Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-06 Shouzhong Feng, Wei Gao, Long Zhou, Jie Li, Weixing Mao, Xianling Liu
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Numerical modeling of gas injection induced cracking with unsaturated hydromechanical process in the context of radioactive waste disposal Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-03 Zhan Yu, Jian-Fu Shao, Gilles Duveau, Meng Wang, Minh-ngoc Vu, Carlos Plua
This study is part of numerical simulations performed on an in-situ heating test conducted by the French National Radioactive Waste Management Agency (Andra) at the Meuse/Haute-Marne Underground Research Laboratory (URL) to study the hydromechanical behavior of the host Callovo-Oxfordian COx claystone in quasi real conditions through the international research project DECOVALEX. In this study, we present
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Experimental investigation of biaxial compressive mechanical property of NPR anchored rock with different preload forces Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-03 Xiaoming Sun, Lei Wang, Li Cui, Yong Zhang, Ming Jiang
In the control system of deep soft rock roadway surrounding rock, preload force plays a crucial role. This paper centers around a new type of constant resistance large deformation anchor cable, also known as NPR (Negative Poisson's Ratio) anchor cable. Based on its static tensile mechanical properties, a comparative experimental study is conducted to investigate the biaxial compressive mechanical properties
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A quantitative digital twin maturity model for underground infrastructure based on D-ANP Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-02 Tao Li, Yi Rui, Sicheng Zhao, Yu Zhang, Hehua Zhu, Xiaojun li
Digital twin (DT), serving as a powerful tool for reflecting semantic and complex properties of underground infrastructure, plays a crucial role in optimising decision-making and closing sensing-control loop. Its application has demonstrated promising potential in advancing project quality and construction efficiency. Nevertheless, the absence of a maturity model (MM) limits the comprehension, evaluation
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Analytical approach for determining the response of a tunnel structure crossing a reverse active fault Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-02-02 Guanxiong Zeng, Yasuo Sawamura, Ping Geng, Kiyoshi Kishida
In practical scenarios, tunnels may unavoidably cross active fault zones, leading to potentially severe damage by active fault displacement during earthquakes. Previous studies have failed to clearly establish an analytical method that considers both compressive and frictional behavior between tunnels and the soil that surrounds them, hindering the understanding of the tunnel-soil interaction. To address
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Analytical study and engineering application of NPR prestressed bolt is anchored by mechanical-type anchorage and resin Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-30 Jiawang Zhan, Jun Yang, Wenhui Bian, Rundong Zhao, Meiqiang Dong
The NPR bolt exhibits excellent engineering properties, such as high tensile strength (950 MPa) and significant elongation (30 %). It can efficiently apply high prestress and endure substantial deformations in the surrounding rock. The anchor system of an NPR bolt consists of a mechanical-type anchorage and resin, both crucial for applying prestress and ensuring effective anchorage. This study delves
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On the response of jointed rigid pipes under abrupt ground subsidence: A closed-form analytical solution Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-30 Xiaogang Qin, Sizhuo Zheng, Pengpeng Ni
The structural safety of jointed rigid pipes can be jeopardized under abrupt ground settlements. Most previous studies have investigated the response and safety of jointed rigid pipes under abrupt ground subsidence using numerical and experimental methods at two specific positions, i.e., the shear band caused by the ground movements crosses the pipe at a joint and at the midspan of a pipe segment.
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Experimental study of a borehole repairing and strengthening device for improving the performance of resin-anchored bolts in soft and broken surrounding rock Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-30 Mengxiong Fu, Shuaishuai Huang, Shaowei Liu, Deyin He, Housheng Jia
During the process of resin-anchored roof bolting in soft and broken surrounding rock, the fractures in the borehole wall can result in resin loss, affecting resin distribution and anchoring quality. In the paper, we developed a borehole repairing and strengthening device (BRSD) for resin-anchored bolt systems. Theoretical analyses, numeric al simulations, laboratory experiments and in situ test were
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On-site tests investigating the effects of blasting vibration amplitude on the dynamic response of thin spray-on liner Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-28 Zongguo Zhang, Xiuzhi Shi, Xianyang Qiu, Jian Ouyang
Studying the dynamic response of support systems under blasting impact holds significance for ensuring the safety of underground space and roadways. Thin spray-on Liner (TSL), an innovative roadway and tunnel support material, has gained considerable global attention. However, the effects of the blasting vibration amplitude on its dynamic response remain unclear. This study, employing 14 on-site blasting
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Laboratory investigation of thermal stresses in fractured granite: Effects of fracture surface roughness and initial stress Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-26 Changlun Sun, Li Zhuang, Dong Joon Youn, Jeoung Seok Yoon, Ki-Bok Min
In order to investigate the effects of fracture surface roughness and initial stress on thermal stresses generated in fractured rock masses, we conducted laboratory heating experiments on 100-mm cubic granite specimens that contained four different kinds of roughness in fractures (i.e., polished, sawcut, mated rough, and unmated rough) under different initial stresses. Thermal expansion in the vertical
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Settlement transfer mechanism of CFG piles for strengthening high-speed railway subgrades induced by twin shield tunnelling undercrossing Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-26 Beiyu Wu, Xing-Tao Lin, Dong Su, Kaihang Han, Xiangsheng Chen
With the development of railway transit networks, the number of twin shield tunnelling undercrossing intercity high-speed railway (HSR) is increasing. However, the understanding of the settlement mechanism of HSR subgrades induced by shield tunnelling undercrossing is still limited. Based on the case of twin tunnels passing through the Xulan HSR in Xi'an, China, a three-dimensional (3D) elaborate finite
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Model test on frost heaving pressure induced by frozen partial ponding behind tunnel lining in cold region Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-23 Xinyu Zheng, Fei Xu, Bing Zhang, Hongbin Xu, Yang Gao
For tunnels in a cold region, the research of frost heaving-induced pressure (FHIP) due to frozen partial ponding is carried out based on certain theoretical assumptions. However, there is few research using the laboratory experiment to investigate the evolution of FHIP with time and space. Therefore, in this paper, to study the mechanism of the FHIP induced by frozen partial ponding of tunnel in the
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Far-field analysis of shear slip potential and ground uplift by high-level radioactive waste repositories with single- and multi-canister and multi-layer disposal concepts Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-24 Eunjin Seo, Kwang-Il Kim, Hwajung Yoo, Jeonghwan Yoon, Ki-Bok Min
This study analyzes the shear slip potential and ground uplift around high-level radioactive waste (HLW) repositories using coupled thermo-hydro-mechanical (THM) numerical models at a far-field scale. Alternative disposal concepts with multi canisters or layers to increase disposal efficiency, which is inversely proportional to the disposal area, are considered. The change in the coulomb failure stress
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Fuzzy seismic fragility analysis of underground structures considering multiple failure criteria Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-22 Minze Xu, Chunyi Cui, Jingtong Zhao, Chengshun Xu, Peng Zhang, Jian Su
To avoid the deficiency of a single failure criterion and deterministic thresholds of limit states in seismic fragility analysis of underground structures, a method of fuzzy seismic fragility analysis of underground structures considering multiple failure criteria is proposed by combining fuzzy-random theory and copula theory. In this method, probabilistic seismic demand and capacity analyses based
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Effect of high humidity on the initial mechanical properties and failure modes of thin spray-on liners (TSLs) Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-23 Lianjun Chen, Jinlong Teng, Guoming Liu, Yuebing Zheng, Xiangfei Cui, Zhi Zhou
Thin Spray-on Liners (TSLs) are a novel rock support technology used in underground projects, which often encounter harsh environments such as high humidity. The mechanical properties of TSLs are affected by the high humidity environment. This study aims to summarize the support mechanisms of TSLs and evaluate the effects of humidity on their performance. Two cement-based TSLs were prepared. They used
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Modelling geomechanical stability of a large deep borehole in shale for radioactive waste disposal Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-23 Baotang Shen, Manoj Khanal, Jingyu Shi, Dirk Mallants
Large diameter boreholes drilled to a depth of 1000–2000 m are currently investigated in Australia as a potential solution for waste emplacement and long-term containment for long-lived intermediate-level radioactive waste (ILW). Different potentially suitable types of host rocks are considered, including granite, shale and salt. This study is aimed at assessing the risk of borehole instability for
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Large-scale field tunnel model experience and time-dependent floor heave induced by humidification Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-20 Zhou Chang, Changgen Yan, Wanye Xie, Zhifang Lu, Hengxing Lan, Haopeng Mei
Humidity diffusion can stimulate soil deformation. However, evidence for triggering water-induced excessive floor deformation in underground structures remains elusive. This study investigated the issue by solving a case of a loess tunnel affected by floor heave. First, the study tracked the development of field damage during tunnel operation and examined the potential influence of base moistening
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Effects of pressure waves on the cooling-fan performance and indoor flow of air-conditioning units on the roof of a high-speed maglev train Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-20 Haixia Guo, Kunlun Zhang, Gang Xu, Jiqiang Niu
Air-conditioning units (ACUs) are important components of trains, and their performance directly affects the thermal environment of train cabins. Their operational performance is affected by the ventilation capacity of its core component, the cooling fan. The compressible unsteady Reynolds-averaged Navier-Stockes (URANS) and the shear-stress transport (SST) k-ω turbulence model were used to simulate
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A novel implementation method of GZZ-based constitutive model into FLAC3D Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-18 Yingming Xiao, Manchao He, Yafei Qiao, Wuqiang Cai, Yujing Jiang, Hehua Zhu
The Generalized Zhang and Zhu (GZZ) strength criterion is one of the three-dimensional criteria suggested by the International Society for Rock Mechanics and Rock Engineering (ISRM), and it has been widely used and validated. However, the shape of GZZ criterion is non-convex and non-smooth on the π-plane, limiting its implementation into the numerical software. To overcome this limitation, many modified
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Intelligent image-based identification and 3-D reconstruction of rock fractures: Implementation and application Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-18 Dongdong Pan, Yihui Li, Xiaote Wang, Zhenhao Xu
This paper develops a method for intelligent identification and semi-automated extraction of 3D fracture parameters based on images in rock slope or underground engineering. Firstly, the exposed fracture trace is automatically identified by the enhanced deeplabv3 + model. Using transfer training methods, rock fracture images of multi-location and multi-type were used to train the model to improve the
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Full-decay induced polarization multi-parameter tomography method for tunnel water inrush ahead prospecting: A case study Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-18 Lichao Nie, Zhicheng Song, Wei Zhou, Zhiqiang Li, Xuecai Du, Liang Ma
The geological structure, hydrology, and geomorphology of the Gaoligongshan tunnel are very complex due to its location in the zone where the Indian and Eurasian plates collide. Therefore, several water inrushes and jams were encountered during the construction process using TBMs. The application of geological prospecting can effectively reduce the occurrence of geological hazards. However, locating
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Analytical solution to the mechanical response of grouting lifting in existing shield tunnels and engineering case verification Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-19 Yanbin Fu, Shun Wang, Ze Wu, Xuezhong Zhang, Junzhou Zhu, Beiling Wang, Yelei Huang
Grouting lifting is the effective approach for treating differential settlement of existing tunnels, but it easily deteriorates the tunnel structure again and seriously threatens the operational safety of urban rail transit. Aiming to solve the above problem, this paper considers the interaction between the tunnel and the foundation, and establishes a series of analytical solutions of the stress, strain
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Corrigendum to “The negative effect of a torsion dissipative structure on the stability and bearing capacity of the yield frame support” [Tunn. Undergr. Space Technol. 144 (2024) 105583] Tunn. Undergr. Space Technol. (IF 6.7) Pub Date : 2024-01-18 V. Nazymko, L. Zakharova, K. Skrzypkowski, O. Kusen
Abstract not available