西宁地区黄土土层厚度对场地地震动参数的影响  

Influence of Loess Soil Thickness on Site Ground Motion Parameter in Xining Region

作　　者：刘薇[1,2] 刘彬 张晓清[1] 

机构地区：[1]青海省地震局,青海西宁810001 [2]中国科学技术大学,安徽合肥230026 [3]青海省规划设计研究院,青海西宁81001

出　　处：《地震研究》2014年第S1期104-108,共5页Journal of Seismological Research

基　　金：青海省地震局地震科学基金(2012A02);青海省科技厅资助项目(2013-Z-710)共同资助

摘　　要：对西宁地区具有不同厚度黄土场地内的黄土土层进行地震动反应分析,得到场地有效峰值加速度随黄土层厚度的增加而产生变化;峰值速度和峰值位移随着黄土层厚度的增加而缓慢减小;随着黄土层厚度的增大,加速度反应谱峰值点向长周期移动,厚层黄土场地具备软弱土场地的某些特性。以上结论可为该地区今后开展地震危险性分析及建筑抗震设防工作提供参考意见。Analyzing the site ground motion response of loess soil in different thicknesses in loess soil site in Xining region,we obtain the site effective peak acceleration changes with the increasing of the thickness of loess layer.The peak velocity and peak displacement decreases slowly with the increasing of thickness of loess layer,and the peak point value of acceleration response spectrum moves to the long cycle with the increasing of thickness of loess layer.The thick layer in loess soil site has the certain characteristics of the site of soft soil.These conclusions can provide some suggestions for carrying out seismic hazard analysis and building for seismic fortification in the study region in the future.

关 键 词：西宁地区 黄土层 土层厚度 地震动参数 

分 类 号：P315.9[天文地球—地震学] TU435[天文地球—固体地球物理学]