西宁地区黄土土层厚度对场地地震动参数的影响*
刘 薇1,2,刘 彬3,张晓清1

(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)

西宁地区; 黄土层; 土层厚度; 地震动参数

Influence of Loess Soil Thickness on Site Ground Motion Parameter in Xining Region
LIU Wei1,2,LIU Bin3,ZHANG Xiao-qing1

(1. Earthquake Administration of Qinghai Province,Xining 810001,Qinghai,China)(2. University of Science and Technology of China,Hefei 230026,Anhui,China)(3. Planning & Design Institute of Qinghai Province,Xining 810001,Qinghai,China)

Xining region; loess layer; thickness of soil layer; ground motion parameter

备注

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.