岩石地区反应位移法关键参数确定方法研究

Research on the Method of Determining Key Parameters of Response Displacement Method in Rock Area

研究目的:反应位移法是地下结构抗震计算的常用方法,但目前反应位移法的应用以及关键参数的选取主要适用土质条件地区,反应位移法在岩石地区的应用案例较少,导致反应位移法在岩石地区的关键参数如何取值的相关研究也较少。本文通过对岩石地区反应位移法关键参数的确定方法进行研究,从而得出相关有应用价值的结论。研究结论:(1)在岩石地区,采用传统经验公式来确定反应位移法的关键参数存在问题,导致计算得出的地震作用显著偏大、失真;(2)在岩石地区,采用一维场地分析及静力有限元法确定的反应位移法关键参数较为合理,计算的地震作用也较合理;在岩石地区,建议采用一维场地分析方法来确定地层相对位移、剪切力,并结合静力有限元法计算基床系数;(3)本研究成果可为岩石地区地下结构的反应位移法计算提供借鉴和参考。

Research purposes:Response displacement method is a common method for seismic calculation of underground structures,but at present,the application of response displacement method and the selection of key parameters are mainly applicable to soil condition areas,there are few cases of application of response displacement method in rock areas,and how to determine the key parameters of the response displacement method in rock area is also less studied.The paper studies the method of determining the key parameters of the response displacement method in rock area,and draws some useful conclusions.Research conclusions:(1)In rock area,there are some problems in using traditional empirical formula to determine the key parameters of the response displacement method,which will lead to significant distortion of the calculated seismic effect.(2)In rock area,the key parameters of response displacement method determined by one-dimensional site analysis and static finite element method are more reasonable,and the calculated seismic action is also more reasonable;In rock area,one-dimensional site analysis method is proposed to determine the relative displacement and shear force of strata,and to calculate the coefficient of subgrade reaction with static finite element method.(3)The research results can provide reference for the calculation of the response displacement method of underground structures in rock areas.