Deformation and failure of a tunnel in the restraining bend of a strike–slip fault zone: an example from Hengshan Mountain, Shanxi Province, China
Deformation and failure of a tunnel in the restraining bend of a strike–slip fault zone: an example from Hengshan Mountain, Shanxi Province, China
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DOI：
10.1007/s10064-016-0850-1
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发表时间：
2017-02
影响因子：
4.2
通讯作者：
D. Lin;R. Yuan;Y. Shang;Weixing Bao;Kaiyang Wang;Zhongjian Zhang;Kun Li;Wantong He
中科院分区：
文献类型：
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作者：
D. Lin;R. Yuan;Y. Shang;Weixing Bao;Kaiyang Wang;Zhongjian Zhang;Kun Li;Wantong He
雁门关隧道穿越中国山西省的恒山。该山主要由变质岩组成，被发育良好的走滑断层系统切割。由于当地的地质背景，隧道在开挖过程中发生了显著的变形和突泥。在本文中，一个代表性的170米长的隧道（从Sta。118 K + 30.0至Sta.以位于走滑断层系约束弯曲区的118 K +200. 0）为例，研究了该断层对隧道稳定性的影响。然后，研究了走滑断层和不对称压力的特征，并结合隧道内的应力和位移监测。分析结果表明，走滑断层使地质条件复杂化，降低了岩体质量。围岩的不同岩体分类是造成隧道内不均匀压力的主要因素，而不均匀压力又对隧道变形产生重要影响。围岩的破坏机制主要为剪切破坏和挤压破坏，围岩发生了较大的变形和突泥。指出在此类地下工程的设计和施工中，应认真调查和分析围岩应力和围岩分类。
The Yanmenguan Tunnel runs through Hengshan Mountain in Shanxi Province, China. The mountain is mainly composed of metamorphic rock cut by a well-developed strike–slip fault system. As a result of the local geological setting, significant deformation and mud bursting occurred during excavation of the tunnel. In this paper, a representative 170-m-long section of the tunnel (from Sta. 118 K + 30.0 to Sta. 118 K + 200.0), which is located in the restraining bend area of the strike-slip fault system, is chosen as a case study to investigate the influence of such a fault on tunnel stability. The characteristics of strike-slip faults and asymmetrical pressure are then investigated, in conjunction with monitoring stress and displacement in the tunnel. The results of the analysis suggest that the strike-slip fault complicates the geological condition and decreases the quality of the rock masses. Different rock mass classifications for the surrounding rocks are the dominant factor causing asymmetrical pressure in the tunnel, which in turn significantly influences deformation in the tunnel. Shear and crushing failure are the mechanisms of failure in the surrounding rocks in the surveyed section, where significant deformation and mud bursting occurred. It indicates that stress and the classifications of surrounding rock masses should be carefully investigated and analyzed during the design and construction of underground engineering works in such a setting.