西安地裂缝界面处地震波传播规律

发布时间：2019-05-13 13:30

【摘要】：地裂缝是黄土地区的一种典型地质灾害,地震波在地裂缝场地中的传播规律是工程界比较关心的一类问题。为了研究地震波在地裂缝处的传播规律,引用西安地区地裂缝界面的等效刚度系数和裂缝面的接触面连续条件,基于运动方程的基本解答,在考虑转换波产生的前提下得出了求解西安地裂缝处地震波透反射系数的频域方程组。对入射角、入射波频率和地裂缝介质等效力学参数的变化对地震波传播规律的影响进行了分析。结果表明,地裂缝对地震波的传播起到了一定的高频滤波作用,当入射波频率较低时波动的传播主要以透射波为主;等效法向刚度只影响P波的传播,等效切向刚度对P波和SV波都有影响;相对于法向刚度,切向刚度的变化对的透反射系数的影响更为明显。
[Abstract]:Ground fissures are a typical geological disaster in loess area. The propagation law of seismic waves in ground fissures is a kind of problem concerned by the engineering field. In order to study the propagation law of seismic waves at the ground fissures, the equivalent stiffness coefficient of the ground fissures interface and the continuous conditions of the contact surfaces of the fissures in Xi'an area are cited, and the basic solutions of the equations of motion are based on the equation of motion. On the premise of considering the generation of converted waves, the frequency domain equations for solving the reflection coefficients of seismic waves at Xi'an ground fissures are obtained. The influence of incident angle, incident wave frequency and equivalent mechanical parameters of ground fracture medium on seismic wave propagation is analyzed. The results show that the ground fissures play a certain role in filtering the propagation of seismic waves, and when the frequency of incident waves is low, the propagation of waves is mainly transmitted waves. The equivalent normal stiffness only affects the propagation of P wave, and the equivalent tangential stiffness has an effect on both P wave and SV wave, and the effect of tangential stiffness on the reflection coefficient is more obvious than that of normal stiffness.
【作者单位】：长安大学建筑工程学院;长安大学地下结构与工程研究所;
【基金】：国家自然科学基金(No.41072221) 陕西省自然科学基金(No.2016JM4103) 长安大学中央高校基本科研业务费专项资金(No.310828163409)~~
【分类号】：P631.4;P694

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