地震和断层错动共同作用下大转向曲线隧道力学行为研究  

Study on Mechanical Behavior of Large Steering Curved Tunnel under Combined Action of Earthquake and Fault Dislocation

作　　者：吴斌 袁松 康泽洲 罗庆斐 王峥峥[3] Wu Bin;Yuan Song;Kang Zezhou;Luo Qingfei;Wang Zhengzheng(Sichuan Yakang Expressway Co,Ltd,Ya’an 625000,Sichuan,China;Sichuan Communication Surveying&Design Institute Co,Ltd,Chengdu 610017,China;School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]四川雅康高速公路有限责任公司,四川雅安625000 [2]四川省交通勘察设计研究院有限公司,成都610017 [3]大连理工大学,建设工程学院,辽宁大连116024

出　　处：《震灾防御技术》2025年第1期153-162,共10页Technology for Earthquake Disaster Prevention

基　　金：四川省交通科技项目(2019-ZL-12)。

摘　　要：针对现有研究较少涉及极高烈度区地震和断层错动共同作用下曲线隧道力学行为的问题,依托跑马山隧道极高烈度地震区和大转向曲线隧道工程特点,通过ABAQUS软件建立大转向曲线隧道在地震和断层错动共同作用下的数值模型,探明截面相对变形、塑性应变及应力纵向分布情况。研究结果表明,曲线隧道在地震和断层错动共同作用下,其截面相对变形最值与变形区域均有较大增长,其中,最值与变形区域较上述二者单独作用分别增长20%、50%;曲线隧道在地震和断层错动共同作用下,其塑性应变极值及影响范围均较地震或断层错动单独作用下高,分别为单独作用下的2、3倍,比二者单独作用下的塑性应变极值和影响范围线性相加大,表明在地震和断层错动共同作用下,其对曲线隧道的影响并非简单的线性相加;根据截面相对变形、等效塑性应变及应力纵向分布情况,可将曲线隧道分为3个区段,分别为增长段、平稳段及断层影响段,对应的长度分别为隧道跨度的50%、33%、17%,增长段主要为断层错动和地震作用的共同结果,而断层影响段主要与断层错动有关。IThis study addresses the limited research on the mechanical behavior of curved tunnels subjected to the combined effects of high-intensity earthquakes and fault dislocations.Using the Paomashan Tunnel,located in a high-intensity seismic zone with a large steering curve,as a case study,a numerical model was developed in ABAQUS to analyze the longitudinal distribution of relative crosssectional deformation,plastic strain,and stress under the combined action of seismic forces and fault dislocation.The results indicate that,under the combined effects of seismic and fault dislocation,the maximum relative cross-sectional deformation and the deformation zones of the curved tunnel increase significantly.Specifically,the maximum deformation increases by 20%,and the deformation zone expands by 50%,compared to the effects of seismic or fault dislocation alone.Additionally,the peak plastic strain and its affected range under the combined action are much higher than those under either seismic or fault dislocation separately,being 2 and 3 times greater,respectively.This demonstrates that the combined impact of seismic and fault dislocation is not simply a linear superposition.Based on the relative cross-sectional deformation,equivalent plastic strain,and longitudinal stress distribution,the curved tunnel can be divided into three sections:the growth section(50%of the tunnel span),the stable section(33%),and the fault-affected section(17%).The growth section is primarily influenced by the combined effects of seismic and fault dislocation,while the fault-af-fected section is mainly dominated by fault dislocation.

关 键 词：曲线隧道 极高烈度区 地震 断层错动 数值模拟 

分 类 号：U451[建筑科学—桥梁与隧道工程]