穿越位移不连续结构面的随机地震波模拟
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摘要
基于非线性位移不连续模型,用半数值半解析方法得到岩体结构面处透射波与反射波质点速度时域显式数值差分格式,编制计算程序模拟随机地震纵波在简单平行多结构面处的传播规律。研究结果表明:随着传过的结构面数目的增多,在特定频率处振幅有先增益后衰减的现象,透射波在时间上有一定延迟。
Based on the nonlinear displacement discontinuity model,an explicit finite-difference scheme of vibration velocity of transmitted and reflected wave in rock joints are obtained by semi-numerical method.Then computational programs are compiled to simulate the transmission of normally incident stochastic seismic P-wave across multiple parallel nonlinear displacement discontinuity joints. It is found that,as the number of nonlinear displacement discontinuity joints increased,the vibration velocity on a certain part of transmitted wave shows a trend of first increase and then decrease,the transmitted wave has time delays.
Based on the nonlinear displacement discontinuity model,an explicit finite-difference scheme of vibration velocity of transmitted and reflected wave in rock joints are obtained by semi-numerical method.Then computational programs are compiled to simulate the transmission of normally incident stochastic seismic P-wave across multiple parallel nonlinear displacement discontinuity joints. It is found that,as the number of nonlinear displacement discontinuity joints increased,the vibration velocity on a certain part of transmitted wave shows a trend of first increase and then decrease,the transmitted wave has time delays.
引文
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[2]黄润秋,余嘉顺.软弱夹层特性对地震波强度影响的模拟研究[J].工程地质学报,2003,11(3):0312-0317.
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[4]俞缙,钱七虎,林从谋,等.纵波在改进的弹性非线性法向变形行为单节理处的传播特性研究[J].岩土工程学报,2009,31(8):1156-1164.
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