Stability analysis of underground surrounding rock mass based on block theory
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Stability analysis of underground surrounding rock mass based on block theory LIN Jian-yun(林健云)1, 2, ZUO Yu-jun(左宇军)1, 2, WANG Jian(王剑)3, ZHENG Lu-jing(郑禄璟)1, 2, CHEN Bin(陈斌)1, SUN Wen-ji-bin(孙文吉斌)1, 4, LIU Hao(刘镐)1, 2 1. Mining College, Guizhou University, Guiyang 550025, China; 2. School of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China; 3. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 4. Priority Research Centre for Geotechnical Science and Engineering, The University of Newcastle, Callaghan, NSW, 2308, Australia © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 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. Key words: key block theory; Unwedge analysis software; stress monitoring system; support evaluation Cite this article as: LIN Jian-yun, ZUO Yu-jun, WANG Jian, ZHENG Lu-jing, CHEN Bin, SUN Wen-ji-bin, LIU Hao. Stability analysis of underground surrounding rock mass based on block theory [J]. Journal of Central South University, 2020, 27(10): 3040−3052. DOI: https://doi.org/10.1007/s11771-020-4527-3.
1 Introduction Around the world, the instability of laneways causes heavy casualties and serious economic losses each year [1−7]. To reduce or prevent instability, it is necessary to analyze the tunnel stability and gain a clear understanding and evaluation of rock mass failure mechanisms. In recent years, ZUO et al [8], LI et al [9−12], ZHU
et al [13, 14], and other experts have done many scientific studies to assess the harm caused by dynamic disturbance in deep mining. Due to the variable nature of rock masses, it is difficult to determine the tunnel stability. These rock masses mainly include faults, joints, anisotropy, bedding, discontinuities, etc. In geotechnical engineering and underground mining, the tunnel stability needs to be evaluated to ensure a stable state d
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