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Stability analysis of underground surrounding rock mass based on block theory

基于块体理论的地下围岩稳定性分析

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Abstract

Evaluation of the performance of existing support in underground tunnels is of great importance for production and interests. Based on field investigation, the shape and number of joints and fractures were investigated in the mining area. Then, the stability of each structural blocks is analyzed by 3D wedge stability analysis software (Unwedge). Moreover, a new analysis method based on critical block theory is applied to analyze the stability of excavated laneways in continuous and discontinuous rock and monitor the stress changes in a fractured tunnel rock mass. The test results indicate that the 3D wedge stability analysis software for underground excavation can evaluate deep tunnel support. Besides, there is no direct relation between the size of the block and the instability of the tunnel. The support method, on large and thick key blocks, needs to be improved. In a broken tunnel section, U-shaped steel support can effectively promote the stress state of the surrounding rock. By monitoring the surrounding rock, it is proven that the vibrating string anchor stress monitoring system is an efficient and real-time method for tunnel stability evaluation.

摘要

在深部巷道支护中对现有支护的评价至关重要, 对安全生产具有重要意义。通过现场布置与测 量, 对矿区的节理裂隙进行了调查, 确定了岩体中节理的形态和数量。然后, 利用三维楔块稳定分析 软件(Unwedge)对地下开挖的各个结构面块体进行稳定性分析。应用关键块体理论对连续和不连续岩 体中开挖巷道的稳定性进行了分析, 并对裂隙围岩的应力变化进行了监测。结果表明: 三维楔形体稳 定性分析软件可以对深部巷道支护进行评价; 块体大小与巷道失稳没有直接关系, 大厚度关键块的支 护方法有待改进; 在巷道软弱破碎段, U 型钢支护能有效改善围岩应力状态。通过对巷道围岩的监测, 证明了振动弦锚应力监测系统是一种高效、实时的地下围岩稳定性评价方法。

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Authors and Affiliations

  1. Mining College, Guizhou University, Guiyang, 550025, China

    Jian-yun Lin  (林健云), Yu-jun Zuo  (左宇军), Lu-jing Zheng  (郑禄璟), Bin Chen  (陈斌), Wen-ji-bin Sun  (孙文吉斌) & Hao Liu  (刘镐)

  2. School of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China

    Jian-yun Lin  (林健云), Yu-jun Zuo  (左宇军), Lu-jing Zheng  (郑禄璟) & Hao Liu  (刘镐)

  3. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Jian Wang  (王剑)

  4. Priority Research Centre for Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW, 2308, Australia

    Wen-ji-bin Sun  (孙文吉斌)

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  1. Jian-yun Lin  (林健云)
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Contributions

LIN Jian-yun, ZUO Yu-jun and WANG Jian analyzed the calculation results and wrote the article; ZHENG Lu-jing collected the construction site information; WANG Jian and CHEN Bin carried out the numerical simulation; SUN Wen-ji-bin and LIU Hao processed the data; and ZUO Yu-jun offered useful suggestions for the preparation and writing of the paper. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Yu-jun Zuo  (左宇军).

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Conflicts of interest

LIN Jian-yun, ZUO Yu-jun, WANG Jian, ZHENG Lu-jing, CHEN Bin, SUN Wen-ji-bin and LIU Hao declare that they have no conflict of interest.

Foundation item: Projects(51964007, 51774101) supported by the National Natural Science Foundation of China; Project(2016-4011) supported by the High-level Innovative Talents Training Project in Guizhou Province, China; Project(2019-5619) supported by the Guizhou Mining Power Disaster Early Warning and Control Technology Innovation Team, China

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Lin, Jy., Zuo, Yj., Wang, J. et al. Stability analysis of underground surrounding rock mass based on block theory. J. Cent. South Univ. Technol. 27, 3040–3052 (2020). https://doi.org/10.1007/s11771-020-4527-3

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