地下圆形衬砌隧道对沿线地震动的影响(II):数值结果  

Effects of an underground lined tunnel on ground motion (II): numerical results

作　　者：梁建文[1] 纪晓东[1] Vincent W Lee 

机构地区：[1]天津大学土木工程系 [2]University of Southern California, CA 90089, USA

出　　处：《岩土力学》2005年第5期687-692,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50378063)项目;教育部优秀青年教师资助计划。

摘　　要：利用地下圆形衬砌隧道对入射平面P波和SV波散射级数解答,定量分析了入射波长、入射角度、隧道直径、衬砌刚度等因素对沿线地表位移放大作用的影响。计算结果表明,当入射频率较低时,地下隧道的存在对地表位移幅值影响不大;而当入射频率较高时,地表位移幅值可以达到无隧道情况的4.5倍以上;衬砌情况下地表位移幅值可以高出非衬砌情况的87.8%。建议在地铁的规划设计中考虑地下隧道的建设对隧道沿线设计地震动的影响。The series solution for the scattering of plane P and SV waves by an underground circular lined tunnel is used to quantitatively analyze the effects of incident wavelength, incident angle, diameter of tunnel, and liner stiffness on ground surface displacement amplification. The numerical results show that, the effects is not large for incident low-frequency waves; the surface displacement amplitude with a tunnel can be 4.5 times of that for the case of without the tunnel; the surface displacement amplitude with a lined tunnel can be 87.8% more than that without the liner. It is suggested that the effects of a tunnel on ground motion should be considered when the tunnel is planned and designed.

关 键 词：地下衬砌隧道 地震动 P波 SV波 放大作用 

分 类 号：O347.4[理学—固体力学]