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断层滑移引起的山岭隧道地震响应

Seismic response of mountain tunnel induced by fault slip.

作者信息

Xia Chen, Wang Zian, He Yongsheng, Chen Yeqing, Li Chunhai, Shi Lei, Zhao Chuan

机构信息

State Key Laboratory of Target Vulnerability Assessment, Institute of Defense Engineering, AMS, PLA, Beijing, China.

International Cooperation Base for Transportation Infrastructure Construction, Beijing University of Civil Engineering and Architecture, Beijing, China.

出版信息

Sci Rep. 2024 Aug 1;14(1):17768. doi: 10.1038/s41598-024-67225-0.

DOI:10.1038/s41598-024-67225-0
PMID:39090133
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11294531/
Abstract

With the rapid development of Chinese transportation networks, such as the Sichuan-Tibet railway, numerous tunnels are under construction or planned in mountainous regions. Some of these tunnels must traverse or be situated near active fault zones, which could suffer damage from fault slip. In this study, the seismic response of a mountain tunnel subjected to coseismic faulting was analyzed using a fault-structure system in a two-step process. Firstly, a nonuniform slip model was proposed to calculate the ground deformations and internal displacements induced by a specific active fault on a geological scale, considering nonuniform slips on the fault plane. The 1989 Loma Prieta and 2022 Menyuan earthquakes were chosen as case studies to validate the proposed slip model. Secondly, the calculated displacement of the Menyuan earthquake was used as the input load for the discrete-continuous coupling analysis of the Daliang tunnel on an engineering scale. The simulated deformation of the Daliang tunnel aligned with the on-site damage observations following the Menyuan earthquake. Lastly, the effects of different fault conditions on the tunnel seismic response were investigated. The results indicate that the distribution of the peak longitudinal strain of the lining is governed by fault mechanisms, and the degree of fault slip significantly influences the response of the tunnel. A tunnel passing through an active fault with a wider fault fracture zone and smaller dip angle experience less damage.

摘要

随着中国交通网络的快速发展，如川藏铁路，山区有众多隧道正在建设或规划中。其中一些隧道必须穿越或位于活动断层带附近，可能会因断层滑动而受损。在本研究中，采用断层 - 结构系统分两步分析了地震断层作用下山区隧道的地震响应。首先，提出了一种非均匀滑动模型，以计算地质尺度上特定活动断层引起的地面变形和内部位移，该模型考虑了断层面上的非均匀滑动。选择1989年洛马普列塔地震和2022年门源地震作为案例研究来验证所提出的滑动模型。其次，将门源地震计算得到的位移作为工程尺度上大梁隧道离散 - 连续耦合分析的输入荷载。大梁隧道的模拟变形与门源地震后的现场损伤观测结果一致。最后，研究了不同断层条件对隧道地震响应的影响。结果表明，衬砌峰值纵向应变的分布受断层机制控制，断层滑动程度对隧道响应有显著影响。穿过断层破碎带较宽且倾角较小的活动断层的隧道受损较小。

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