土动剪切模量比的不确定性对莱州湾近海海域深软场地地震动参数的影响  

Effect of dynamic shear modulus ratio of soil on ground motion parameters of deep soft ground in offshore areas of Laizhou Bay

作　　者：郭婷婷 刘建民 杨宏智 GUO TingTing;LIU JianMin;YANG HongZhi(Shandong Institute of Earthquake Engineering,Jinan 250021,China;Earthquake Administration of Shandong Province,Jinan 250014,China;Shandong Institute of Geophysical and Geochemical Exploration,Jinan 250000,China)

机构地区：[1]山东省地震工程研究院,济南250021 [2]山东省地震局,济南250014 [3]山东省物化探勘查院,济南250000

出　　处：《地球物理学进展》2023年第4期1765-1774,共10页Progress in Geophysics

基　　金：中国地震局星火专项(XH20035)资助。

摘　　要：本文主要针对莱州湾近海海域深软场地(Ⅲ类场地),根据场地不同深度段(15 m以上、15~30 m、30~65 m、65 m以下及基岩输入面)土层的动剪切模量比的初始试验值,进行增加或减小15%与30%的调整,其他计算输入参数不变,进行了63种工况的土层地震反应分析计算.根据不同工况的地表峰值加速度PGA与地表加速度反应谱形态的计算分析结果,并与实际场地动参数结果进行对比研究,得出不同深度段土层的动剪切模量比的不确定性对莱州湾近海海域深软场地地表峰值加速度PGA与加速度反应谱的影响及其规律性.其结果对我国近海海域深软场地的建设工程抗震设防工作有重要的参考意义.In this paper,for the deep soft site(Ⅲtype site)in offshore areas of Laizhou Bay,based on initial test value of dynamic shear modulus ratio of soil layer at different depths(above 15 m,15~30 m,30~65 m,below 65 m,and bedrock input surface),the test values of 15%and 30%are increased or decreased,and other input parameters are the same,soil seismic response analysis of 63 kinds of working conditions are conducted.Results of surface peak acceleration and response spectrum of different working conditions are calculated,and compared with calculation results of practical soil layer seismic response analysis.Effect and its regularity of uncertainty of dynamic shear modulus ratio of soil layer at different depths on surface peak acceleration and ground acceleration response spectrum are preliminarily concluded.The results have important reference significance for seismic fortification of deep soft sites in offshore areas.

关 键 词：动剪切模量比 地震动参数 地表峰值加速度 地表加速度反应谱 超越概率 

分 类 号：P631[天文地球—地质矿产勘探]