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Study on construction mechanical characteristics and pinch rocks reinforcement schemes of honeycomb tunnel clusters in Mountainous City
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.tust.2025.106397
Hai Chen, Xiaohan Zhou, Xinrong Liu, Suliman Lojain, Qiang Xu, Lijun Ren

Due to the growing need for underground space and the acceleration of urbanization, narrow clearance tunnel clusters are being created, making construction more challenging. This paper investigated tunnel clusters consisting of five parallel tunnels at Hongyan Village in Chongqing as a background project. The mechanical behaviour of the clusters has been studied by using three main methods as the following: model test, theoretical analysis, and numerical simulation. The induced forces characteristics in the pinch rock based on the stress correlation theory have been accomplished, with establishing a pinch-rock yielding reserve (YR) model for different pinch-rock reinforcement schemes to be compared with the other ones. The results can be introduced as the following: (1) During the stage of temporary support removal, the incremental displacement of the crown of each tunnel accounted for 6.25 %∼60.53 % of the total displacement. Moreover, it seems that the temporary support has a significant influence on the stability of the surrounding rock. (2) The value of YR depends on the position of the shear and tensile damage line, the “centre” and the “radius” of the Mohr’s circle. A smaller value indicates a higher tendency towards instability. (3) For the left pinch rock that has been disturbed many times during the construction of the tunnel clusters, the combination of prestressed tie-back anchors- grouting is preferred, which raises the maximum value of the YR to 1,324.62 kN/m.

中文翻译:


山地城市蜂窝隧道群施工力学特性及夹石加固方案研究



由于对地下空间的需求不断增长和城市化进程的加速,狭窄的净空隧道集群正在形成,使施工更具挑战性。本文以重庆市红岩村由 5 条平行隧道组成的隧道群为背景项目进行了调查。通过使用以下三种主要方法研究了集群的机械行为:模型测试、理论分析和数值模拟。基于应力相关理论的夹岩诱导力特性,建立了不同夹岩加固方案的夹岩屈服储量(YR)模型,与其他方案进行了比较。结果可归纳为以下几点:(1)在临时支护拆除阶段,各隧道拱顶增量位移占总位移的6.25 %∼60.53 %。此外,临时支护似乎对围岩的稳定性有重大影响。(2) YR 的值取决于剪切和拉伸损伤线的位置、莫尔圆的“中心”和“半径”。值越小,表示不稳定的倾向越高。(3)对于隧道群施工过程中多次扰动的左侧夹岩,优选采用预应力系杆锚-注浆相结合,使年率最大值提高到1 324.62 kN/m。
更新日期:2025-01-21
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