摘要
为分析地表超载对浅埋盾构隧道抗震性能的影响规律,以上海典型浅埋盾构隧道为例进行地震易损性分析。首先,基于Abaqus有限元平台,建立考虑地表超载-地震共同作用的动力分析模型;其次,分析不同超载条件下土体-隧道结构地震响应规律;最后,以隧道直径变形率作为地震损伤指标,建立地表超载影响下浅埋盾构隧道地震易损性分析模型。研究结果表明:(1)随着地震强度与地表超载的增大,隧道直径变形率呈非线性增大且增速加快;(2)随着地表超载的增大,土体-隧道结构的各类地震动力响应均快速增大;(3)随着地表超载的增大,浅埋隧道达到各种损伤状态的概率均增大,且越严重的损伤状态出现的概率增加的越快,当地震强度为0.2g时,地表超载从0 kPa增大到100 kPa,发生轻度破坏的概率增加约3.5倍,发生中度破坏的概率增加近6倍,发生严重破坏的概率增加近9倍。
In order to investigate the impact of surcharge loads on the seismic resilience of shallow tunnels,a fragility analysis is conducted using a representative shallow tunnel in Shanghai as the example.Firstly,a dynamic analysis model under the influence of surcharge loads and earthquake was established based on the finite element software code Abaqus.Secondly,the seismic response of soil and tunnel structure under different surcharge loads was analyzed.Finally,the seismic fragility curves of the shallow tunnel under the influence of surcharge loads were established by taking the deformation rate of the tunnel transverse diameter as the damage measure of the tunnel.The findings indicate that:(1)As the seismic intensity and surcharge loads increase,the deformation rate of the tunnel diameter exhibits a nonlinear growth pattern,with an accelerated rate of change;(2)As surcharge loads increase,all types of seismic dynamic response increase rapidly.(3)With the increase of surcharge loads,the probability of shallow tunnel reaching various damage states increases.Furthermore,as the damage state becomes more severe,the probability of that state occurring also increases faster.When the surcharge loads increase from 0 kPa to 100 kPa at an earthquake intensity of 0.2g,the probability of minor damage increases by a factor of about 3.5;the probability of moderate damage increases by a factor of nearly 6;and the probability of extensive damage increases by a factor of nearly 9.These findings can provide reference for the seismic design of shallow tunnels.
作者
黄忠凯
邓星冕
张冬梅
孙双箎
HUANG Zhongkai;DENG Xingmian;ZHANG Dongmei;SUN Shuangchi(Department of Geotechnical Engineering,Tongji University,Shanghai 200092;College of Civil Engineering and Water Resources,Qinghai University,Qinghai 810016;Shanghai Shen-Tie Investment Co.,Ltd,Shanghai 200032)
出处
《现代隧道技术》
CSCD
北大核心
2024年第S01期300-314,共15页
Modern Tunnelling Technology
基金
国家重点研发计划课题(2022YFC3800905)
国家自然科学基金(52238010,52108381,52090082)
青海省科学技术厅基础研究计划项目(2023-ZJ-926M)
关键词
盾构隧道
软土地区
易损性分析
地表超载
动力响应
数值模拟
Shield tunnel
Soft soil
Fragility analysis
Surcharge loads
Dynamic response
Numerical simulation
作者简介
黄忠凯(1992-),男,博士,讲师,主要从事盾构隧道结构易损性分析、安全评价与韧性提升方面的研究工作,E-mail:5huangzhongkai@tongji.edu.cn;通讯作者:张冬梅(1975-),女,博士,教授,主要从事隧道施工与环境相互影响、隧道结构安全、运营隧道新型监测方法方面的研究工作,E-mail:dmzhang@tongji.edu.cn.
