风化花岗岩裂隙对盾构隧道衬砌地震易损性曲线的影响  

Effect of weathered granite cracks on the seismic fragility curve of shield tunnel lining

作　　者：张文杰[1,2] 向平 李英波 张飞宇 王志兵[1,2] 于啸波 ZHANG Wenjie;XIANG Ping;LI Yingbo;ZHANG Feiyu;WANG Zhibing;YU Xiaobo(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;School of Civil Engineering,Guilin University of Technology,Guilin 541004,China;China Nonferrous Metal Changsha Survey and Design Institute Co.,Ltd.,Changsha 410001,China;Shenzhen Railway Investment and Construction Group Co.,Ltd.,Shenzhen 518035,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木工程学院,广西桂林541004 [3]中国有色金属长沙勘察设计研究院有限公司,湖南长沙410001 [4]深圳铁路投资建设集团有限公司,广东深圳518035

出　　处：《世界地震工程》2025年第1期175-188,共14页World Earthquake Engineering

基　　金：国家自然科学基金(52278492);广西岩土力学与工程重点实验室资助课题(桂科能19-Y-21-5);桂林理工大学科研启动基金资助项目(GUTQDJJ2019043)。

摘　　要：以穿越风化花岗岩地层的广州市轨道交通五号线盾构区间隧道为工程背景,建立裂隙-双隧道非线性时程分析模型,采用增量动力时程分析方法,探究裂隙角度、长度及注浆填充组合工况下的隧道衬砌易损性曲线的变化规律。采用弯矩比作为衬砌损伤指标,采用地表峰值加速度和地表峰值速度作为地震强度指标,得到隧道衬砌的易损性曲线,阐明裂隙对隧道衬砌的抗震性能影响。结果表明:衬砌损伤概率会随裂隙在震动方向上投影长度增大而提高;衬砌损伤概率与裂隙长度呈正相关关系;对裂隙进行C25砂浆填充之后,隧道衬砌的地震损伤概率降低,表明工程实践中对裂隙进行填充的操作既可以提高围岩静稳定性,也可以提高隧道衬砌抗震性能。节理裂隙对围岩的局部劣化作用导致隧道衬砌地震损伤概率增加,效果与隧道场地剪切波速降低后相近。The study takes the shield tunnel section of Guangzhou Metro Line 5,which passes through weathered granite strata,as the engineering background.Nonlinear time history analysis models of double tunnel,with cracked surrounding rock,is established,and the incremental dynamic analysis are used to explore the variation law of the seismic fragility curve of tunnel lining under the combined conditions of crack angle,length,and grouting filling.The present study uses the bending moment ratio as the damage index for the lining,and uses the peak ground acceleration and peak ground velocity as the seismic strength index to obtain the fragility curve of the tunnel lining,elucidating the impact of cracks on the seismic performance of the tunnel lining.The results indicate that the damage probability of lining increases with the increase of the projected length of cracks in the vibration direction;The damage probability of lining is positively correlated with the length of cracks;After filling the cracks with C25 mortar,the seismic damage probability to the tunnel lining decreases,indicating that filling the joint cracks in engineering practice can not only improve the static stability of the surrounding rock,but also enhance the seismic performance of the tunnel lining.The local deterioration of the surrounding rock caused by joint cracks increases the probability of seismic damage to the tunnel lining,which is similar to the effect of reducing the shear wave velocity at the tunnel site.

关 键 词：盾构隧道 地震响应 地震易损性 裂隙 风化花岗岩 

分 类 号：P319.56[天文地球—固体地球物理学]