摘要
采用了间接边界元法(IBEM),研究了山岭隧洞在平面P-SV波入射下的地震动力响应问题。该方法充分利用半空间格林函数与全空间格林函数在构造半空间开口域和全空间闭合域中散射波场的优势,将含有衬砌隧洞的凸起地形分解为一个半空间开口域和两个全空间闭合域。本文验证了方法的正确性,并以入射平面P-SV波在均匀半空间和基岩上单一土层中山岭隧洞地形周围散射为例,计算出了这两种情况下凸起地形周围地表位移放大系数和隧洞衬砌内表面动应力集中系数。分析得出由于基岩的存在,使得山岭隧洞的动力响应得以放大;随着入射波频率的增大,地表位移放大系数和应力集中系数都呈减小趋势;对于不同的入射角度,地表位移放大系数和应力集中系数也存在显著差异。
The effects on the seismic response of mountain tunnel under plane P-SV waves are studied by adopting the indirect boundary element method(IBEM). The method takes advantage of both half-space IBEM and full-space IBEM to construct the opened layered elastic half-space region and the closed full-space region,the mountain with lined tunnel is decomposed into an opened layered elastic half-space region and two closed full-space regions. The method is verified and the amplification coefficient of the ground surface displacement and the lined cavity dynamic stress concentration are calculated in a homogeneous half-space and a single layered on bedrock. Results show that the dynamic response of the site is enlarged because of the existence of bedrock,the displacement amplitude coefficient and stress amplification coefficient decrease with the increase of the frequency of the excitations,the displacement amplitude coefficient and stress amplification coefficient are also obviously different due to different incidence angles.
作者
巴振宁
喻志颖
梁建文
BA Zhenning;YU Zhiying;LIANG Jianwen(Department of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coastal Structures in Civil Engineering and Safety of Ministry of Education,Tianjin 300072,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2018年第5期50-58,共9页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51778413)~~
关键词
格林函数
间接边界元法
地表位移放大系数
动应力集中系数
Green function
IBEM
coefficient of displacement amplitude
coefficient of dynamic stress concentration
