断层错动和地震动共同作用下跨断层隧道的损伤分析  

Analysis of Cross Fault Tunnel Damage under Combined Action of Fault Dislocation and Ground Motion

作　　者：陈之毅[1] 郭远鹏 CHEN Zhiyi;GUO Yuanpeng(College of civil engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《防灾减灾工程学报》2023年第1期132-137,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51778464)资助。

摘　　要：大量的历史实例表明,跨断层隧道在地震中会受到严重的破坏。因此,跨断层隧道在断层错动作用下的破坏机理被广泛研究。然而,对在地震现象中占比最高的构造地震而言,断层错动和地震动是形影相随的,将两者分开考虑存在局限性。文章采用三维有限元模型模拟并量化了断层错动单独作用、地震动单独作用和断层错动-地震动共同作用三种加载方式下隧道结构的损伤情况,结合耗散能指标对断层错动和地震动共同作用对跨断层隧道的影响展开了分析。结果表明,在发生断层错动时,地震动对隧道的影响是不可忽略的,在分析中考虑地震动是必要的;断层错动和地震动共同作用时,由于累积损伤,地震动造成的破坏比地震动单独作用时明显加剧。A large number of historical examples show that cross fault tunnels will be seriously damaged in earthquakes.Therefore,the failure mechanism of cross fault tunnels under fault dislocation has been widely investigated.However,in tectonic earthquakes,which account for the highest proportion of seismic phenomena,fault dislocation and ground motion occur simultaneously,and there are limitations in considering them separately.In this paper,a three-dimensional finite element model is used to simulate and quantify the damage to tunnel structures under three loading modes:fault dislocation alone,ground motion alone,and fault dislocation with ground motion combined.The influence of fault dislocation and ground motion on cross fault tunnels is analyzed by incorporating the dissipated energy index.The results show that the influence of ground motion on the tunnel cannot be ignored when fault dislocation occurs,and it is necessary to consider ground motion in the analysis.When fault dislocation and ground motion act together,the damage caused by ground motion is significantly worse than that caused by ground motion alone due to cumulative damage.

关 键 词：跨断层隧道 断层错动 地震动 损伤 耗散能 

分 类 号：U459.3[建筑科学—桥梁与隧道工程] X951[交通运输工程—道路与铁道工程]