Methane in-situ explosion fracturing (MISEF) enhances permeability in shale reservoirs by detonating desorbed methane to generate detonation waves in perforations. Fracture propagation in bedding shale under varying explosion loads remains unclear. In this study, prefabricated perforated shale samples with parallel and vertical bedding are fractured under five distinct explosion loads using a MISEF

The redistribution of three-dimensional (3D) geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane, potentially resulting in engineering disasters. However, the current understanding of rockmass shear behavior is mainly based on shear tests under 2D stress without lateral stress, the shear fracture under 3D stress is unclear, and the relevant

Methane (CH4) and carbon dioxide (CO2) are primary components of coal seam gas (CSG). Understanding their adsorption-desorption hysteresis characteristics, along with the fundamental mechanism, is crucial for CSG exploitation and related hazards mitigation. This research focused on the representative Bulli coal seam in the Sydney Basin, Australia. Through the purpose-built indirect gravimetric high-pressure

There is limited applicability to the current method for testing the direct tensile strength of rocks because it places stringent requirements on the testing equipment. This work suggests a universal method based on the “compression-to-tension” idea in response to these difficulties. By applying pressure, this technique makes it possible to test the tensile strength of rocks directly with any conventional

Effectively separating bastnaesite from calcium-bearing gangue minerals (particularly calcite) presents a formidable challenge, making the development of efficient collectors crucial. To achieve this, we have designed and synthesized a novel, highly efficient, water-soluble cationic collector, N-dodecyl-isopropanolamine (NDIA), for use in the bastnaesite-calcite flotation process. Density functional

The development and utilization of lunar resources are entering a critical stage. Immediate focus is needed on key technologies for in-situ resource utilization (ISRU) and lunar base construction. This paper comparatively analyzes the basic characteristics of lunar regolith samples returned from Chang’e-5 (CE-5), Apollo, and Luna missions, focusing on their physical, mechanical, mineral, chemical,

To elucidate the characteristics and mechanism of electromagnetic radiation in granite under impact loading, based on the quasi-static compression tests, this paper conducts dynamic compression experiments on granite using Hopkinson pressure bar and one-stage light-gas gun as loading methods. Combined with experimental and theoretical analyses, the relationship between mechanical and electromagnetic

To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice, firstly, an efficient pretreatment process, grinding–HCl washing–flotation–HF and HCl leaching, was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration. The results showed

Understanding the impact of mining disturbances and creep deformation on the macroscopic deformation and the microscopic pore and fracture structures (MPFS) of coal is paramount for ensuring the secure extraction of coal resources. This study conducts cyclic loading-unloading and creep experiments on coal using a low-field nuclear magnetic resonance (NMR) experimental apparatus which is equipped with

After landing in the Utopia Planitia, Tianwen-1 formed the deepest landing crater on Mars, approximately 40 cm deep, exposing precious information about the mechanical properties of Martian soil. We established numerical models for the plume-surface interaction (PSI) and the crater formation based on Computational Fluid Dynamics (CFD) methods and the erosion model modified from Roberts’ Theory. Comparative

Lunar soil simulants (LSS) have been pivotal in the success of past and current lunar missions. They have enhanced the design of lander and rover wheels through interaction studies on the lunar testbed under simulated environmental conditions. They have also been used to evaluate the geotechnical, geomechanical, and dynamic characteristics of the lunar soil (LS), which is vital for future lunar outposts

The lunar surface and its deep layers contain abundant resources and valuable information resources, the exploration and exploitation of which are important for the sustainable development of the human economy and society. Technological exploration and research in the field of deep space science, especially lunar-based exploration, is a scientific strategy that has been pursued in China and worldwide

A novel small molecule depressant (M-DEP) was used to separate chalcopyrite and molybdenite via flotation. The results showed that M-DEP had an excellent selective depression on molybdenite, while had little effect on the flotation of chalcopyrite. The adsorption capacity of M-DEP on the surface of molybdenite was greater than that on chalcopyrite surface. The adsorption of M-DEP reduced the floatability

Multistage hydraulic fracturing of horizontal wells (MFHW) is a promising technology for controlling coal burst caused by thick and hard roofs in China. However, challenges remain regarding the MFHW control mechanism of coal burst and assessment of the associated fracturing effects. In this study, these challenges were investigated through numerical modelling and field applications, based on the actual

Some rock joints exhibit significant brittleness, characterized by a sharp decrease in shear stress upon reaching the peak strength. However, existing models often fail to accurately represent this behavior and are encumbered by numerous parameters lacking clear mechanical significance. This study presents a new statistical damage constitutive model rooted in both damage mechanics and statistics, containing

Leading national space exploration agencies and private enterprises are actively engaged in lunar exploration initiatives to accomplish manned lunar landings and establish permanent lunar bases in the forthcoming years. With limited access to lunar surface materials on Earth, lunar regolith simulants are crucial for lunar exploration research. The Chang’e-5 (CE-5) samples have been characterized by

The wetting-drying (W-D) cycle is a type of water–rock interaction. The pore structure of rock, such as shape, size, distribution and pore throat, affects fluid storage and transport. Fractal theory and experimental research on the evolution characteristics of pore damage during the wet-dry erosion process are highly important for determining W-D damage. The mass and velocity of liquid migration are

The exploration of Mars would heavily rely on Martian rocks mechanics and engineering technology. As the mechanical property of Martian rocks is uncertain, it is of utmost importance to predict the probability distribution of Martian rocks mechanical property for the success of Mars exploration. In this paper, a fast and accurate probability distribution method for predicting the macroscale elastic

The application of ductile rock bolts has been a crucial method for solving the problems of large deformations, energy absorption and stability control issues in deep rock masses. To study the anchoring mechanism of the key expansive structure, this paper proposes a novel type of bolt — the Ductile-Expansion bolt, and conducts research on anchoring mechanics, energy absorption characteristics, and

High stress in surrounding rock will lead to serious problems, e.g., rock burst in hard rock and large deformation in soft rock. The applied support system under high in-situ stress conditions should be able to carry high load and also accommodate large deformation without experiencing severe damage. In this paper, a specially designed energy-absorbing component for rock bolt and cable that can solve

The infrared radiation temperature (IRT) variation concerning stress and crack evolution of rocks is a critical focus in rock mechanics domain and engineering disaster warning. In this paper, a methodology to extract the key IRT features related to stress and crack evolution of loaded rocks is proposed. Specifically, the wavelet denoising and reconstruction in thermal image sequence (WDRTIS) method

Knowledge of the mechanical behavior of planetary rocks is indispensable for space explorations. The scarcity of pristine samples and the irregular shapes of planetary meteorites make it difficult to obtain representative samples for conventional macroscale rock mechanics experiments (macro-RMEs). This critical review discusses recent advances in microscale RMEs (micro-RMEs) techniques and the upscaling

The optimization of government subsidies to enhance the efficiency of coal companies’ green transformation constitutes a critical component in the pursuit of global sustainability. We investigate the influence mechanism of government subsidies on the green transformation using data from the listed coal companies in China from 2007 to 2022. According to our findings and hypothesis testing, previous

Amid the scarcity of lunar meteorites and the imperative to preserve their scientific value, non-destructive testing methods are essential. This translates into the application of microscale rock mechanics experiments and scanning electron microscopy for surface composition analysis. This study explores the application of Machine Learning algorithms in predicting the mineralogical and mechanical properties

An in-process technology approach is proposed to identify the source of acid mine drainage (AMD) generation and prevent its formation in a porphyry copper waste rock (WR). Adopting actions before stockpiling the WR enables the establishment of potential contaminants and predicts the more convenient method for AMD prevention. A WR sample was separated into size fractions, and the WR’s net acid-generating

Complexities in mechanical behaviours of rock masses mainly stem from inherent discontinuities, which calls for advanced bolt-grouting techniques for stability enhancement. Understanding the mechanical properties of bolt-grouted fractured rock mass (BGFR) and developing accurate prediction methods are crucial to optimize the BGFR support strategies. This paper establishes a new elastoplastic (E-P)

Rock failure can cause serious geological disasters, and the non-extensive statistical features of electric potential (EP) are expected to provide valuable information for disaster prediction. In this paper, the uniaxial compression experiments with EP monitoring were carried out on fine sandstone, marble and granite samples under four displacement rates. The Tsallis entropy q value of EPs is used

In order to solve the problem that current theory models cannot accurately describe thick-hard roof (THR) elastic energy and assess the mine tremor disasters, a theoretical method, a Timoshenko beam theory on Winkler foundation was adopted to establish the THR’s periodic breaking model. The superposition principle was used for this complex model to derive the calculation formulas of the elastic energy

The electrochemical interaction between galena and monoclinic pyrrhotite was investigated to examine its impact on the physical and chemical properties of the mineral micro-surface. This investigation employed techniques such as electrochemistry, metal ion stripping, X-ray photoelectron spectroscopy, and quantum chemistry. The electrochemical test results demonstrate that the galena surface in the

The load-bearing performance (LBP) of pumpable supports (PPS) is crucial for the stability of longwall pre-driven recovery room (PRR) surrounding rock. However, the unbalanced bearing coefficient (UBC)of the PPS (undertaking unequal load along the mining direction) has not been investigated. A mechanical model of the PRR was established, considering the main roof cantilever beam structure, to derive

During the process of constructional backfill mining, the cemented paste backfill (CPB) typically exhibits a high degree of brittleness and limited resistance to failure. In this study, the mechanical and damage evolution characteristics of waste tire steel fiber (WTSF)-modified CPB were studied through uniaxial compression tests, acoustic emission (AE) tests, and scanning electron microscopy (SEM)

Monitoring sensors in complex engineering environments often record abnormal data, leading to significant positioning errors. To reduce the influence of abnormal arrival times, we introduce an innovative, outlier-robust localization method that integrates kernel density estimation (KDE) with damping linear correction to enhance the precision of microseismic/acoustic emission (MS/AE) source positioning

Coral reef limestone at different depositional depths and facies differ remarkably on the textural and mineralogical characteristics, owing to the complex sedimentary diagenesis. To explore the effects of pore structure and mineral composition associated with diagenetic variation on the mechanical behavior of reef limestone, a series of quasi-static and dynamic compression tests along with microscopic

The Moon, as the closest celestial body to the Earth, plays a pivotal role in the progression of deep space exploration, and the establishment of research outposts on its surface represents a crucial step in this mission. Lunar lava tubes are special underground caves formed by volcanic eruptions and are considered as ideal natural shelters and scientific laboratories for lunar base construction. This

Given the depletion of high-quality magnesite deposits and the rising demand for high-end magnesium materials, the separation and utilization of high-calcium magnesite ores have become essential. However, the similar surface properties and solubility of semi-soluble salt-type minerals, pose significant challenges for the utilization of dolomite-rich magnesite resources. In this study, 1-hydroxypropane-1

Deep coalbed methane (DCBM), an unconventional gas reservoir, has undergone significant advancements in recent years, sparking a growing interest in assessing pore pressure dynamics within these reservoirs. While some production data analysis techniques have been adapted from conventional oil and gas wells, there remains a gap in the understanding of pore pressure generation and evolution, particularly

Underground engineering often passes through water-rich fractured rock masses, which are prone to fracture and instability under the long-term coupling of in-situ stress field and pore water (P-W) pressure, ultimately threatening the stability of underground structures. In order to explore the mechanical properties of rocks under H-M coupling, the corresponding damage constitutive (D-C) model has become

Understanding the effects of microwave irradiation and thermal treatment on the dynamic compression and fragmentation properties of rocks is essential to quantify energy consumption in rock engineering. In this study, Fangshan granite (FG) specimens were exposed to microwave irradiation and heat treatment. The damage of FG specimens induced by these two methods was compared using X-ray CT scanning

Water decoupling charge blasting excels in rock breaking, relying on its uniform pressure transmission and low energy dissipation. The water decoupling coefficients can adjust the contributions of the stress wave and quasi-static pressure. However, the quantitative relationship between the two contributions is unclear, and it is difficult to provide reasonable theoretical support for the design of

To better understand the failure behaviours and strength of bolt-reinforced blocky rocks, large scale extensive laboratory experiments are carried out on blocky rock-like specimens with and without rockbolt reinforcement. The results show that both shear failure and tensile failure along joint surfaces are observed but the shear failure is a main controlling factor for the peak strength of the rock

Effective separation of residual carbon and ash is the basis for the resource utilization of coal gasification fine slag (CGFS). The conventional flotation process of CGFS has the bottlenecks of low carbon recovery and high collector dosage. In order to address these issues, CGFS sample taken from Shaanxi, China was used as the study object in this paper. A new process of size classification − fine

This study delves into the intricate relationship between iron (Fe) content in kaolinite and its impact on the adsorption behavior of sodium oleate. The effects of different iron concentrations on adsorption energy, hydrogen bond kinetics and adsorption efficiency were studied through simulation and experimental verification. The results show that the presence of iron in the kaolinite structure significantly

Identifying the real fracture of rock hidden in acoustic emission (AE) source clusters (AE-depicted microcrack zone) remains challenging and crucial. Here we revealed the AE energy (representing dissipated energy) distribution rule in the rock microcrack zone and proposed an AE-energy-based method for identifying the real fracture. (1) A set of fracture experiments were performed on granite using wedge-loading

Establishing a base on the Moon is one of the new goals of human lunar exploration in recent years. Sintered lunar regolith is one of the most potential building materials for lunar bases. The physical, mechanical and thermal properties of sintered lunar regolith are vital performance indices for the structural design of a lunar base and analysis of many critical mechanical and thermal issues. In this

Fracture propagation in shale under conditions is a critical but poorly understood mechanical process in hydraulic fracturing for deep shale gas reservoirs. To address this, hydraulic fracturing experiments were conducted on hollow double-wing crack specimens of the Longmaxi shale under conditions simulating the ground surface (confining pressure =0, room temperature ()) and at depths of 1600 m (=40 MPa

Blasting operations, which are crucial to open-pit mine production due to their simplicity and efficiency, require precise control through accurate vibration velocity calculations. The conventional Sadowski formula mainly focuses on blast center distance but neglects the amplification effect of blasting vibration waves by terraced terrain, from which the calculated blasting vibration velocities are

3D printing is widely adopted to quickly produce rock mass models with complex structures in batches, improving the consistency and repeatability of physical modeling. It is necessary to regulate the mechanical properties of 3D-printed specimens to make them proportionally similar to natural rocks. This study investigates mechanical properties of 3D-printed rock analogues prepared by furan resin-bonded

Imaging the wave velocity field surrounding a borehole while drilling is a promising and urgently needed approach for extending the exploration range of the borehole point. This paper develops a drilling process detection (DPD) system consisting of a multifunctional sensor and a pilot geophone installed at the top of the drilling rod, geophones at the tunnel face, a laser rangefinder, and an onsite

Underground constructions often encounter water environments, where water–rock interaction can increase porosity, thereby weakening engineering rocks. Correspondingly, the failure criterion for chemically corroded rocks becomes essential in the stability analysis and design of such structures. This study enhances the applicability of the Hoek-Brown (H-B) criterion for engineering structures operating

2D profile lines play a critical role in cost-effectively evaluating rock joint properties and shear strength. However, the interval (Δ) between these lines significantly impacts roughness and shear strength assessments. A detailed study of 45 joint samples using four statistical measures across 500 different Δ values identified a clear line interval effect with two stages: stable and fluctuation-discrete

Ground hydraulic fracturing plays a crucial role in controlling the far-field hard roof, making it imperative to identify the most suitable target stratum for effective control. Physical experiments are conducted based on engineering properties to simulate the gradual collapse of the roof during longwall top coal caving (LTCC). A numerical model is established using the material point method (MPM)

Basalt is a major component of the earth and moon crust. Mineral composition and temperature influence frictional instability and thus the potential for seismicity on basaltic faults. We performed velocity-stepping shear experiments on basalt gouges at a confining pressure of 100 MPa, temperatures in the range of 100–400 °C and with varied obsidian mass fractions of 0–100% under wet/dry conditions

The Voronoi grain-based breakable block model (VGBBM) based on the combined finite-discrete element method (FDEM) was proposed to explicitly characterize the failure mechanism and predict the deformation behavior of hard-rock mine pillars. The influence of the microscopic parameters on the macroscopic mechanical behavior was investigated using laboratory-scale models. The field-scale pillar models

Underground pumped storage power plant (UPSP) is an innovative concept for space recycling of abandoned mines. Its realization requires better understanding of the dynamic performance and durability of reservoir rock. This paper conducted ultrasonic detection, split Hopkinson pressure bar (SHPB) impact, mercury intrusion porosimetry (MIP), and backscatter electron observation (BSE) tests to investigate

The relationship between support and surrounding rock is of great significance to the control of surrounding rock in mining process. In view of the fact that most of the existing numerical simulation methods construct virtual elements and stress servo control to approximately replace the hydraulic support problem, this paper establishes a new numerical model of hydraulic support with the same working

The 2D limit equilibrium method is widely used for slope stability analysis. However, with the advancement of dump engineering, composite slopes often exhibit significant 3D mechanical effects. Consequently, it is of significant importance to develop an effective 3D stability calculation method for composite slopes to enhance the design and stability control of open-pit slope engineering. Using the

Underground hydrogen storage (UHS) and compressed air energy storage (CAES) are two viable large-scale energy storage technologies for mitigating the intermittency of wind and solar power. Therefore, it is meaningful to compare the properties of hydrogen and air with typical thermodynamic storage processes. This study employs a multi-physical coupling model to compare the operations of CAES and UHS

Fractal theory offers a powerful tool for the precise description and quantification of the complex pore structures in reservoir rocks, crucial for understanding the storage and migration characteristics of media within these rocks. Faced with the challenge of calculating the three-dimensional fractal dimensions of rock porosity, this study proposes an innovative computational process that directly