摘要
采用二维动力有限元法分析软土隧道埋深的地震动力响应。以波动理论解析解为标准,在验证有限元模型合理性后,选取II-IV类等效均质场地和上海分层场地(IV类)建模,研究典型圆形隧道在不同埋深的地震动力响应。结果表明,均质场地中,圆形隧道地震动力响应与埋深和入射波波长有较强相关性,当埋深为入射波长的1/4时,隧道动力响应有明显放大作用;上海分层场地中隧道动力响应与地层性质有较大相关性,剪切模量较小的地层,隧道动力响应会增加,隧道埋深浅(土层剪切模量小)动力响应更显著。
The two-dimensional dynamic finite element method is used to analyze the seismic dynamic response of soft soil tunnels.Based on the analytical solution of the wave theory,after verifying the rationality of the finite element model,the category II-IV equivalent homogeneous site and the Shanghai layered site(category IV)are selected for modeling to study the seismic effects of typical circular tunnels at dynamic response with different depths.The results show that there is a strong correlation between the seismic dynamic response of circular tunnel and the buried depth and incident wavelength in homogeneous site.When the buried depth is 1/4 of the incident wavelength,the tunnel dynamic response can be significantly amplified;there is a great correlation between tunnel dynamic response and stratum properties in layered sites in Shanghai.In the stratum with small shear modulus,the tunnel dynamic response will increase,and the dynamic response of shallow tunnel buried depth(small soil shear modulus)is more significant.
作者
袁勇
王祺
YUAN Yong;WANG Qi(Department of Underground Architecture&Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Civil Engineering Disaster Prevention,Tongji University,Shanghai 200092,China)
出处
《中国市政工程》
2021年第5期90-95,120,121,共8页
China Municipal Engineering
关键词
圆形隧道
埋深
地震响应
结构分析
circular tunnel
buried depth
seismic response
structure analysis
