粘弹性人工边界及其在盆地地震效应研究中的应用

Viscous-spring artificial boundary and its application to study on seismic effect of basin

利用波动理论推导了粘弹性人工边界上地震动的输入公式,并将其应用于盆地的地震效应研究。基于ABAQUS有限元分析软件对内源及外源的波动算例进行了计算,数值模拟结果与理论解进行了对比,验证了粘弹性人工边界及其上地震动输入方法的合理性与正确性。在此基础上,将其应用于盆地地震效应的数值分析,准确模拟了自由成层场地的地表位移及盆地效应的基本趋势,得出了盆地倾斜角度与盆地内覆土层性能对盆地效应的影响规律。结果表明,使用粘弹性人工边界及其上地震动输入模拟复杂场地的地震效应具有较强的适用性及准确性,分析结果可供类问题的研究。

The seismic wave input formula for viscous-spring artificial boundary was deduced by the wave theory,which was applied to study the seismic effect of basin.Based on the finite element analysis software ABAQUS,the internal and external source wave motion were calculated as the verifying examples.The comparison of the numerical simulation results and the theoretical solutions demonstrates the rationality and validity of the viscous-spring artificial boundary and seismic wave input.On this basis,this formula is applied to the numerical simulation of seismic effect of basin.The displacement response of free stratified ground surface and the basic trend of basin effect were simulated accurately.The influence rule of basin angle and soil property on the seismic response of basin was obtained.The results show that the presented viscous-spring artificial boundary and seismic wave input have strong applicability and accuracy in the stimulation of the seismic response of complex field.The results obtained from the present analysis give a reference to research on this topic.