摘要
为掌握不同形式隧道结构在近断层地震下动力响应特性,同时给隧道衬砌选型提供依据。以乌鲁木齐轨道交通2号线穿越九家湾近断层为背景,通过建立马蹄形和箱型曲拱隧道结构的三维动力分析模型,施加人工合成的地震波,对比两种结构形式在近断层地震作用下位移、速度、应力响应特性及安全储备,明确其动力响应特性。结果表明:两种衬砌结构在近断层地震作用下均保持完整,但箱型曲拱结构速度峰值及位移幅值略大;地震作用下隧道衬砌结构各部位速度响应基本一致,且主要取决于地震动特性;对于穿越断层破碎带的衬砌结构,其地震作用下的应力响应明显增加,破碎围岩对地震动效应有放大作用;两种衬砌形式在地震作用下的安全性能均满足要求,实际工程中应结合适应性条件合理选用。
In order to study the mechanical response of different types of lining under near-fault earthquake,based on the Urumqi rail transit line 2 project,the three-dimensional finite difference program was adopted to establish the dynamic numerical models of the horseshoe and box-shaped curved arch tunnel structure.In view of the site vibration characteristics,artificial seismic wave was applied to analyze the displacement,velocity and stress responses of the two structures,supplemented by the calculation of the structural safety factor,the seismic dynamic response characteristics and application range of the two structures were obtained.The results show that the safety performance of the two types of lining can meet the requirements.The box curved arch structure almost does not deform permanently and has stronger adaptability to ground motion.The velocity response of each part of the tunnel lining is basically the same and mainly depends on the characteristics of ground motion.For the lining structure that crosses the fault fracture zone,the stress response under seismic action increases obviously,and the broken surrounding rock can amplify the effect of ground motion,which should be taken into full consideration in the design.
作者
尹超
朱星宇
张志强
YIN Chao;ZHU Xing-yu;ZHANG Zhi-qiang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《科学技术与工程》
北大核心
2021年第35期15209-15214,共6页
Science Technology and Engineering
基金
国家自然科学基金(51878572)
国家高铁联合基金(U1934213)。
关键词
城市隧道
近断层
地震动力响应
数值计算
衬砌选型
urban tunnel
near-fault
seismic dynamic response
numerical calculation
selection of lining
