中文摘要：

根据青藏工程走廊北麓河及楚玛尔河场地地震危险性分析结果,合成年超越概率为1.97%、1.00%、0.21%、0.10%、0.04%、0.02%的人造基岩地震波作为输入地震动,结合场地钻孔剖面及波速资料,和已有的冻土动力学研究成果,建立一维模型,通过等效线性化方法进行场地地震反应分析计算,研究了青藏工程走廊多年冻土场地地震动加速度峰值特征及影响因素.研究结果表明,北麓河场地与楚玛尔河场地的人造基岩地震波峰值及持时均存在显著差异,北麓河场地峰值大、持时短,以近震影响为主,楚玛尔河场地峰值小、持时长,以中远震影响为主;多年冻土区场地,夏季场地地震动加速度峰值显著大于冬季,活动层融化对场地地震动加速度峰值有明显的放大效应;冬季场地冻结后,场地地震动加速度峰值随冻土波速增大而减小,最大减小幅度为6.1%,随动剪切模量比减小、阻尼比增大而减小,最大减小幅度为8.9%.活动层的融化有利于放大场地地震动加速度峰值,重大冻土工程抗震设防应予以重视.

英文摘要：

Based on the results of the seismic hazard analysis of the Beiluhe site and Chumaerhe site along Qinghai-Tibet engineering corridor,artificial bedrock seismic waves with the exceedance probabilities of 1. 97%,1. 00%,0. 21%,0. 10%,0. 04%,0. 02% in 1 year were synthesized to use as input waves. One-dimensional model was established by integrating borehole profiles,wave velocities and the existing research results of frozen soil dynamic parameters. Used an equivalent linearity seismic response analysis method,characteristics of site seismic peak ground acceleration（ SSPGA） and its influential factors at permafrost sites along Qinghai-Tibet Engineering Corridor（ QTEC） were studied. The results showthat,（ 1） peak values and durations of artificial bedrock seismic waves of the Beiluhe site are significantly different from Chumaerhe site,（ 2） in permafrost site,SSPGA in summer significantly greater than in winter; because the thawed active layer has amplified SSPGA,（ 3） after frozen in winter,SSPGA decreases with the increase of the frozen soil wave velocity,maximum decrease amplitude is 6. 1%,SSPGA decreases with the decrease of Gd/ Gdmaxand increase of λ,maximum decrease amplitude is 8. 9%. The thawing of the active layer has the effect to enlarge SSPGA,so seismic fortification of the major permafrost project should be attached more importance.