含软弱夹层土深厚场地输入界面的确定  

Inputting interface of earthquake wave in deep site with soft interlayer

作　　者：王冲[1] 齐文浩[2] 刘明军[1] 莘海亮[1] 李忠良[1] 

机构地区：[1]中国地震局地球物理勘探中心,河南郑州450002 [2]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《世界地震工程》2016年第3期112-119,共8页World Earthquake Engineering

基　　金：中国地震局星火计划项目(XH16051Y)

摘　　要：为研究含软弱夹层土深厚场地输入界面的确定方法,在一个场地剖面的基础上,另外构造了一个特殊场地剖面,计算了两个剖面在6个强度的地震动输入下,输入界面选择在不同位置时的峰值加速度A_(max),特征周期T_g和反应谱平台值α_(max),分析了两种土层剖面的地表地震动参数对输入界面改变的敏感性。结果发现特殊场地的敏感性较差,输入界面深度相差44.4m,剪切波速相差111m/s,但得到A_(max)、T_g和α_(max)相差不到10%、12%和8%,所以深厚的特殊场地在确定输入界面时,可以适当放宽对输入界面深度和剪切波速的要求,可满足一般工程的精度要求。To study determining method of the inputting interface of earthquake wave in deep site with soft interlayer, based on one engineering site profile, another site profile was built. Ground peak acceleration（Amax ） ,character istic period of response spectra （Tg） and platform value of response spectra （αmax） of tWO site profiles for different inputting interfaces were calculated under six different intensity earthquake inputs through the one - dimensional e- quivalent finearization. The sensitivity of ground motion parameters to the change of the inputting interfaces of the two site profiles was analyzed. The result show that ground motion parameters of the site with soft interlayer have poor sensitivity to the inputting interface. When the depth of inputting interface reduce by 44.4m and the shear wave velocity of inputting interface reduce by l llm/s, A Tg and αmax change less than 10 percent,12 percent and 8 percent respectively. Therefore, when we determine the inputting interface, we can relax the requirements properly for depth and shear wave velocity of the inputting interface, and meet the accuracy requirement of general engineering.

关 键 词：软弱夹层 地震波输入界面 地震动参数 

分 类 号：P315[天文地球—地震学]