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- Title
大凉山地区深埋高地应力公路隧道岩 爆机理及防治对策.
- Authors
洪富义; 李旭哲; 王子; 陈诺; 梁斌; 李文杰
- Abstract
Based on the Daliangshan No. 2 tunnel project of Lexi Expressway, the rockburst mechanism and prevention countermeasures of deep buried highway tunnels with high ground stress in the Daliangshan area were studied and analyzed. From the perspective of rockburst incubation mechanics of deep buried tunnels, combined with energy and stress conditions, the finite element analysis software MIDAS GTS NX was used to establish three-dimensional finite element models of the tunnel at different depths, cross-section shapes, and the stress characteristics of surrounding rock were compared and analyzed. The results show that from the mechanical point of view, the preparation process of rock burst is transformed from elasticity to plasticity and the rock burst occurs in plastic rock. The surrounding elastic rock is responsible for providing energy for it. The energy stored in surrounding rock and the stress concentration caused by excavation are the fundamental and triggering conditions for the occurrence of rock burst, respectively. The buried depth, excavation depth and cross-section shape are important factors affecting the rock burst of tunnel, among which the buried depth has the most obvious influence. The maximum principal stress of surrounding rock is positively correlated with buried depth, excavation depth, and cross-section size. When the buried depth is about 600 m, the maximum principal stress of the surrounding rock reaches 45. 90 MPa. According to the intensity stress ratio method, combined with the construction drilling core parameters, the final results show that Daliangshan tunnel belongs to the extremely high ground stress area, which has the risk of rockburst, and relevant preventive measures should be taken during construction.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 29, p12697
- ISSN
1671-1815
- Publication type
Article