中等强度地震下季冻区场地响应影响研究  

The impact of parameters in seasonal frozen area response under moderate intensity earthquake

作　　者：陈卓识 孟上九[2] 袁晓铭[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 [2]哈尔滨理工大学,黑龙江哈尔滨150080

出　　处：《土木工程学报》2013年第S1期166-171,共6页China Civil Engineering Journal

基　　金：国家科技部地震公益性行业科研专项(201308015);国家自然科学基金(51278472)

摘　　要：用一维等效线性化程序对二类和三类季节性冻土场地的响应进行计算,给出多种工况下的地表反应谱。通过改变冻土的厚度,冻土的剪切波速,场地的动剪切模量比,研究不同参数对季冻区场地地震响应的影响。研究表明,季节性冻土对地震响应有影响仅是偏于一类的二类场地(1号场地)。与常温状态相比,该场地中反应谱峰值最大上升约1/4,地表最大加速度增大约20%。其余场地的季节性冻土影响均可以忽略。在1号场地当中,冻土剪切波速对峰值加速度的影响较大,冻深对峰值加速度有一定影响。无论何种场地,冻土动剪切模量比的变化对地震响应影响均可以忽略。By using one-dimensional equivalent linear program,this article calculated class 2 and class 3 seasonal frozen ground response spectrums,and gave out spectrums under 95 operating conditions. By changing the thickness of the permafrost,the frozen soil shear wave velocity,and the venue of the dynamic shear modulus ratio,the author studied the impact of different parameters on the seismic response of seasonal frozen area venues. The analysis in this article showed that only site 1 impacted by the seasonal frozen soil. Although the site 1 had been called class 2 site,but the characters of that were more like class 1 site. Compared to that in normal temperature condition,the peak of response spectrum rise about 1 /4 and the peak ground acceleration rise of about 20%. The impact of seasonally frozen soil of other venues can be ignored. In site 1,the permafrost shear wave velocity is the one of the most important influence factor. Also the thickness of permafrost has some impact of the peak acceleration. No matter what kind of the venues in this passage,permafrost dynamic shear modulus ratio has no impact to the seismic response.

关 键 词：季节性冻土 剪切波速 地震响应 一维等效线性化 

分 类 号：P315[天文地球—地震学]