二维有限元基岩水平向地震动模拟方法及检验  

SIMULATION OF HORIZONTAL BEDROCK GROUND MOTION PARAMETERS BY TWO-DIMENSIONAL FINITE ELEMENT METHOD AND VERIFICATION

作　　者：孟庆筱[1,2,3] 王太松[1] 韩勇[1] 胡国新 吕健[1] 郭宝震[1] 李伟亮[1] 

机构地区：[1]中国地震局第一监测中心,天津300180 [2]中国地震局地震研究所(地震大地测量重点实验室),武汉430071 [3]中国地震局地壳应力研究所武汉科技创新基地,武汉430071 [4]中煤平朔集团有限公司,朔州036000

出　　处：《大地测量与地球动力学》2014年第4期9-16,20,共9页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所所长基金项目(IS201266113);中国地震局地震科技星火计划项目(XH14067Y);中国地震局第一监测中心预测室基金项目(201304003)

摘　　要：通过接触算法建立二维有限元模型,参考相应的震源机制解,通过合理设置地震参数,采用美国下一代地震动衰减关系(NGA)为有限元模型提供内源地震动输入波组,进而使用动力有限元法计算研究区内任意场址处的水平向基岩地震动峰值加速度及反应谱。对2012年唐山4.7级地震过程中的地面运动进行模拟,对台站观测值与有限元模拟值的幅值PGA和频谱Sa(T)进行比较。研究发现,场址处模拟地震动加速度反应谱组合的几何平均值与台站观测值一致性良好,同时断裂带两侧地震动峰值加速度出现明显不连续分布。Horizontal bedrock ground motion neering sites. The contact algorithm were applied parameters are important for the seismic safety evaluation of engi- to construct 2-dimension FEM simulation model which included the active faults. We considered the focal mechanism solution to explore a proper scenario earthquake parameter set- ting for NGA model in order to supply the input time history. Dynamic FEM method were used to calculate the PGA and Sa （T） which had considered the source characteristics and dielectric characteristics. We use Tangshan M4.7 Earthquake in 2012 to verify the method, and the comparison of FEM and observations in time or frequency domain proved that the method was promising. We also find that the bedrock ground motion PGA on both sides of the fault distributes discontinuously.

关 键 词：地震安全性评价 地震动模拟 有限元 峰值加速度 反应谱 

分 类 号：P312[天文地球—固体地球物理学]