正断层错动下地铁盾构隧道的合理避让距离研究
张逸飞1康潇月2王天强1代聪3姚超凡1杨文波1何川1吕林海4
Reasonable Avoidance Distance of Metro Shield Tunnels under Normal Fault Dislocation
ZHANG Yifei1KANG Xiaoyue2WANG Tianqiang1DAI Cong3YAO Chaofan1YANG Wenbo1HE Chuan1LYU Linhai4
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作者信息:1.西南交通大学交通隧道工程教育部重点实验室， 610031， 成都
2.招商局重庆交通科研设计院有限公司， 400067， 重庆
3.四川省交通运输发展战略和规划科学研究院， 610041， 成都
4.南宁轨道交通建设有限公司， 530029， 南宁
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Affiliation:1.Key Laboratory of the Ministry of Education of Southwest Jiaotong University, 610031, Chengdu, China
2.China Merchants Chongqing Communications Research & Design Institute Co., Ltd., 400067, Chongqing, China
3.Sichuan Academy of Transportation Development Strategy and Planning Sciences, 610041, Chengdu, China
4.Nanning Rail Transit Construction Co., Ltd., 530029, Nanning, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230494
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］正断层错动极易导致地铁盾构隧道失稳和破坏，因此需研究正断层错动及其与断层破裂面不同相对位置下盾构隧道的力学特性，以确定合理的避让距离。［方法］建立了考虑基岩上覆土应变软化和管片接头刚度的数值模型，通过离心模型试验进行验证。通过数值模拟，分析了盾构隧道平行穿越正断层条件下隧道的力学特性。以地铁列车最不利工况下的倾覆风险为基准，讨论了正断层错动下盾构隧道的合理避让距离。［结果及结论］正断层错动作用下盾构隧道发生较大的转动和位移，且错动过程中隧道的围岩压力和内力均发生较大变化，其变化规律同隧道与自由场地破裂面的相对位置有关。盾构隧道使正断层破裂面拓展路径发生明显迁移。正断层错动下地铁盾构隧道的合理避让距离随埋深的增加而减小。在H0/D (H0为盾构隧道上覆土层厚度，D为隧道直径)≤ 1.0时，上盘侧合理避让距离≥1.2D，下盘侧合理避让距离≥1.0D；1.0 ≤ H0/D ≤ 2.0时，上盘侧和下盘侧合理避让距离均≥0.9D；H0/D ≥ 2.0时，上盘侧合理避让距离≥0.7D，下盘侧合理避让距离≥0.9D。
Abstracts:
［Objective］ Normal fault dislocation is prone to cause instability and damage to metro shield tunnels. Therefore, it is necessary to study the mechanical characteristics of shield tunnels under normal fault dislocation and their relative positions to the fault rupture plane, in order to determine a reasonable avoidance distance. ［Method］ A numerical model considering the strain-softening behavior of the overburden soil on bedrock and the segment joint stiffness is established and validated through centrifugal model tests. Numerical simulations are conducted to analyze the mechanical behavior of shield tunnels crossing normal faults in a parallel manner. Based on the risk of overturning under the most unfavorable operating conditions of metro trains, a reasonable avoidance distance of shield tunnels under normal fault dislocation is discussed. ［Result & Conclusion］ Under normal fault dislocation, the shield tunnel undergoes significant rotation and displacement, and the surrounding rock pressure and internal forces of the tunnel change considerably during the dislocation process. These variations are related to the relative position between the tunnel and the rupture plane in a free-field condition, because the presence of the shield tunnel significantly alters the propagation path of the normal fault rupture plane. A reasonable avoidance distance of metro shield tunnels under normal fault dislocation will decrease with increasing burial depth. When H0/D (H0 as the thickness of shield tunnel, D as tunnel diameter) ≤ 1.0, the reasonable avoidance distance on the hanging wall side should be ≥1.2D, and on the footwall side ≥1.0D; when 1.0 ≤H/D≤ 2.0, the reasonable avoidance distance on both sides should be ≥0.9D; when H/D≥ 2.0, the hanging wall side should be ≥ 0.7D, and the footwall side ≥0.9D.
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