中等强度地震下季冻区场地响应  

Ground response in seasonal frozen regions under moderate intensity earthquakes

作　　者：陈卓识 李兆焱[1] 孙锐[1] 

机构地区：[1]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《岩土工程学报》2013年第S1期406-411,共6页Chinese Journal of Geotechnical Engineering

基　　金：博士后研究人员落户黑龙江科研启动资助项目

摘　　要：《建筑抗震设计规范》(GB50 011—2010)将工程场地分为四类。目前的抗震设计工作还缺乏针对每类场地的季冻区反应谱分析。设计时只对夏季反应谱进行了计算,缺乏对冬季含冻土场地的数据验算。冻土场地地表响应计算参数多为定性分析,大部分缺乏工程实测数据,同时计算采用的模型缺乏通用性。针对不同类别的场地与不同冻土深度和多种剪切波速组合的工况进行计算,得到了季冻区场地在中等强度地震下的地表反应谱。笔者认为:在一、二类场地中的场地较薄、波速较高的情况下,冬季发生冰冻的反应谱峰值要明显大于夏季未冰冻的反应谱峰值,需要对含冻土的反应谱进行单独计算。三、四类场地中,冬季和夏季反应谱重合,不需要进行单独计算。The Seismic Design Code(GB50 011-2010) sets four classifications of sites.At the same time the anti-seismic design is mainly based on the conventional mud,neglecting the impact of the permafrost.The parameters for calculating the response of the seasonal frozen ground are based on qualitative analysis which is lack of measured data.The models lack versatility.In accordance with the analogy of different sites at different depths of frozen soil and permafrost shear-wave velocities,the ground response spectra of seasonal frozen sites under moderate intensity earthquake are calculated.It is suggested that in the first and second class sites,in which the shear-wave velocity are higher and the soil depth are thinner,the peak of winter spectra are higher than thaose in summer.Thus,the response spectra in winter should be analyzed.In the third and fourth class sites,there is no need to calculate the spectra influenced by the permafrost.

关 键 词：季节性冻土 反应谱 场地响应 

分 类 号：P315.9[天文地球—地震学]