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强震动作用下土体非线性动力特征研究发展与展望
王玉石,李小军,兰日清,王宁,陈红娟
作者单位
王玉石 中国地震局地球物理研究所, 北京 100081 
李小军 中国地震局地球物理研究所, 北京 100081;北京工业大学建筑工程学院, 北京 100124 
兰日清 中国地震局地球物理研究所, 北京 100081 
王宁 中国地震局地球物理研究所, 北京 100081 
陈红娟 中国地震局地球物理研究所, 北京 100081 
摘要:
浅地表覆盖土层动力特性对地震动影响显著,软厚土层会明显改变地震动强度及频谱特性。由于观测数据匮乏,强震动作用下土体非线性动力特征研究长期以来均以室内试验为主,但在实验室中难以可靠地模拟实际地震历程中土体承受的加载路径、边界条件、排水条件等复杂因素。近二十年来竖向台阵(至少包含一个地表测点和一个井下基岩测点)记录数据大量增加,为土体非线性动力学研究提供了新的基础数据与发展机遇,使基于现场观测的土体非线性动力特征实证研究成为可能。
关键词:  强震动  土动力学  局部场地效应  强震动观测  竖向台阵记录
DOI:
分类号:
基金项目:This project was sponsored by the Specific Fund of Fundamental Research, Institute of Geophysics, China Earthquake Administration (DQJB16B19).
Development and Prospect of Study on Soil Nonlinear Dynamic Characteristics under Strong-Motion
Wang Yushi,Li Xiaojun,Lan Riqing,Wang Ning,Chen Hongjuan
Abstract:
Ground motions are significantly influenced by dynamic characteristics of overburden soil layers near ground surface, as thick and soft soil layers would obviously amplify the ground motion strength. The conventional research method on soil nonlinear dynamic characteristics under strong motions is based on experiments in laboratories for the deficiency of observation data, but it is difficult to reliably simulate the complex factors of soils in actual earthquake durations, including loading paths, boundary conditions, and drainage conditions. The incremental data of the vertical downhole observation array, which is comprised of at least one observation point on ground surface and one observation point in a downhole rock base, makes it possible to study soil nonlinear dynamics according to in situ observation data, and provides new basic data and development opportunities to soil nonlinear dynamics studies.
Key words:  Strong-motion  Soil dynamics  Local site effect  Strong-motion observation  Vertical array record