基于Midas的双线盾构隧道抗震性能研究  

Study on Seismic Performance of Double-Line Shield Tunnel Based on Midas

作　　者：张文杰[1] 魏懿 于啸波 Zhang Wenjie;Wei Yi;Yu Xiaobo(College of Civil Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China;Changsha Survey,Design and Research Institute of China Non-ferrous Metal,Changsha,Hunan 410000,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林理工大学土木工程学院,广西桂林541004 [2]中国有色金属长沙勘察设计研究院有限公司,湖南长沙410000 [3]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

出　　处：《黑龙江工业学院学报(综合版)》2024年第12期140-147,共8页Journal of Heilongjiang University of Technology(Comprehensive Edition)

基　　金：国家自然科学基金项目“地下水-车辆荷载耦合作用下浅覆盖型岩溶顶板-路基协同损伤时空演化”(项目编号:52169022);广西岩土力学与工程重点实验室资助课题“岩溶顶板地震易损性分析”(课题编号:桂科能19-Y-21-5);校级科研项目-桂林理工大学科研启动基金“含溶洞场地地震反应研究”(项目编号:GUTQDJJ2019043)。

摘　　要：以广佛环线某区间隧道为研究对象,采用Midas构造了非线性时程分析模型。通过增量动力时程分析方法,研究了不同裂隙角度下,左右侧隧道衬砌弯矩的变化规律以及易损性曲线的特征。分析中选择衬砌弯矩比作为损伤指标,采用地表峰值加速度来衡量地震强度。结果显示,上行与下行圆形盾构隧道在地震作用下的弯矩幅值和分布表现出相似的规律,此外,盾构隧道下方的裂隙对左右两侧隧道的地震响应行为均产生了影响,且这种影响程度相当。进而得出结论,上行与下行隧道的抗震性能相近;衬砌的损伤概率会随着裂隙在震动方向上投影长度的增大而相应提高。Taking a section of the Guangzhou-Foshan Ring Road as the research object,a nonlinear time history analysis model was constructed by using Midas.Through the incremental dynamic time-history analysis method,the variation pattern of the lining bending moments in the up-track and down-track tunnels under different fracture angles and the characteristics of the fragility curves were studied.In the analysis,the lining bending moment ratio was selected as the damage index,and the peak ground acceleration was used to measure the seismic intensity.The results show that the amplitude and distribution of the bending moments of the circular shield tunnels on the left and right sides under seismic action exhibit similar patterns.In addition,the fractures below the shield tunnels have an impact on the seismic response behavior of both tunnels,and the degree of this impact is equal.It is further concluded that the seismic performance of the up-track and down-track tunnels is similar;the probability of lining damage increases with the increase in the projected length of the fracture in the direction of vibration.

关 键 词：盾构隧道 地震易损性 增量动力分析 Midas GTS NX 围岩缺陷 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程] U451.4