岩溶场地地表地震动特性研究

Ground Motion Characteristics of Karst Sites

摘要:

对典型岩溶场地进行土层地震反应分析,并与非岩溶场地土层的地震反应进行对比,研究岩溶场地地表地震动的基本特性,为岩溶区工程场地地震动参数的确定提供参考。实例研究表明:与非岩溶场地的土层地震反应相比,岩溶场地土层对地震波的放大效应较强,地表地震动的频率偏高;当岩溶场地中发育有土洞时,地表地震动加速度峰值比不含土洞的岩溶场地要大。

Abstract:

This study describes the use of finite element analysis to study the seismic response of a typical karst site compared with that of other sites.The results showed that compared with other non-karst sites,karst field soil has a stronger amplification effect on the seismic wave,and the ground motion frequency is higher.When there are holes in the karst site,the seismic peak ground acceleration is larger than that of a non-holed karst foundation.These results provide a reference for the ground motion parameters determined at a karst site.