区域场地近地表速度结构建模研究  

Modeling sub-surface velocity structures of regional sites

作　　者：师黎静[1] 宋健 党鹏飞 刘佳轩 SHI Li-jing;SONG Jian;DANG Peng-fei;LIU Jia-xuan(Institute of Engineering Mechanics,China Earthquake Administration,Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration,Harbin 150080,China;Guangdong Hualu Transportation Technology Co.,Ltd.,Guangzhou 510550,China;Guangdong Jiaoke Testing Co.,Ltd.,Guangzhou 510550,China)

机构地区：[1]中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]广东华路交通科技有限公司,广东广州510550 [3]广东交科检测有限公司,广东广州510550

出　　处：《岩土工程学报》2022年第2期360-367,F0003,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(51978635);国家重点研发计划项目(2018YFC1504601)。

摘　　要：近地表速度结构是全面考虑城市区域场地地震效应,精细模拟地震动场及建筑群震害的基础。针对复杂交错沉积的区域场地,建立了先基于工程地质先验信息限定交错土体边界,利用序贯指示模拟求解各类交错土体空间概率分布,再依据剪切波速与工程地质结构的空间相关关系,借助序贯高斯模拟构建波速结构模型的方法;在搜集分析钻孔波速资料基础上,构建了哈尔滨市区场地三维速度结构模型;通过与工程地质剖面的定性对比分析、剪切波速-埋深统计关系和实测波速的定量比较,验证了方法的可行性。结果表明:构建的三维工程地质模型具有空间预测能力,能够反映区域场地工程地质结构特征,构建的剪切波速结构模型与工程地质结构有很好的相关性,适用于模拟随深度减小剪切波速增大的复杂场地结构。本文模型更利于根据详细岩土类型给定地震反应分析中的非线性动力学参数。The sub-surface shear wave velocity structure of regional sites provides an important basis for the comprehensive consideration of the site seismic effects in the fine simulation of urban ground motion fields and seismic damages of building groups.In this study,a method is proposed to establish the complex staggered sedimentary structure of regional sites.First,the boundary of the staggered soils is confined based on the available information of engineering geology,then the spatial probability distribution of interlaced soils is solved by the sequential indicator simulation method,and then the velocity structure is modeled based on the spatial correlation between shear wave velocity and engineering geological structure quantified by the sequential Gaussian simulation method.Accordingly,the three-dimensional(3 D) velocity structure of Harbin urban site is modeled based on the borehole soil information and shear wave velocity data.The feasibility of this method is verified through the qualitative analysis of consistence with engineering geological sections and the quantitative comparison with velocity structures tested in boreholes and estimated by the experimental relation between velocity and depth.The results demonstrate that the 3 D model makes a good spatial prediction of engineering geological structure and reflects well on the structure characteristics of regional sites.The shear wave velocity structure of the proposed model shows a good correlation with the engineering geological structure,and even the velocity decreases with the increasing depth.Furthermore,in seismic response analysis,the proposed model is far more conducive to specifying the nonlinear dynamic parameters according to the detailed rock and soil types.

关 键 词：区域场地 序贯指示模拟方法 工程地质结构 序贯高斯模拟方法 波速结构 

分 类 号：TU435[建筑科学—岩土工程] P315.9[建筑科学—土工工程]