P波斜入射陡坎地形对地面运动的影响

发布时间：2018-02-14 14:01

本文关键词： 陡坎地形 P波斜入射地面运动放大系数　出处：《岩土力学》2017年06期 　论文类型：期刊论文

【摘要】：针对陡坎地形,采用数值模拟方法,探讨了陡坎地形在P波斜入射时,入射角度θ、坡角α和入射方向变化等参数对地震波传播的影响。结果表明:(1)从陡坎底部到陡坎顶部,放大系数逐渐增大,而入射角度、坡角和入射方向没有影响。(2)入射角度θ一定时,无论地震波顺着陡坎方向(左)入射还是逆着陡坎方向(右)入射,陡坎上侧的放大系数大于陡坎下侧的放大系数。同时,放大系数随着坡角α的增大而增大。(3)坡角α不变,地震波顺着陡坎方向(左)入射时,x分量的放大系数随着入射角的增大而增大,z分量的放大系数则随着入射角的增大而减小。(4)地震波逆着陡坎方向(右)入射时,放大系数最大值基本在陡坎上侧边缘。地震波顺着陡坎方向(左)入射时,放大系数最大值并没出现在陡坎上侧边缘,坡角越大,偏离越大。(5)地震波顺着陡坎方向(左)入射时,x分量的放大系数比地震波逆着陡坎方向(右)入射时的大,z分量变化不大。
[Abstract]:In steep terrain, using the method of numerical simulation, discusses the scarp terrain in oblique incident P waves, incident angle, angle and direction of influence of slope parameters such as the change of seismic wave propagation. The results showed that: (1) from the bottom to the top of steep scarp, the amplification coefficient increases gradually, and the incident no impact angle, slope angle and incident direction. (2) the incident angle is constant, regardless of the seismic wave along the scarp direction (left) or incident against the scarp direction (right) incident, multiplication coefficient is greater than the upper side of the steep scarp side. At the same time, the amplification coefficient increases with the increase of slope the angle alpha. (3) the slope angle constant, seismic wave along the scarp direction (left) incident, the amplification coefficient of x component increases with the increase of the incident angle, the amplification coefficient of Z component decreases with the increase of the incident angle of seismic wave. (4) against the steep ridge direction (right) the incident, the maximum amplification factor In the upper edge scarp. Seismic waves along the scarp direction (left) incident, the amplification coefficient of the maximum value did not appear in the upper edge of the scarp slope angle, the greater the larger the deviation is. (5) seismic waves along the scarp direction (left) incident when the amplification coefficient of X component ratio of seismic wave along the scarp direction (right) incident, z component did not change.

【作者单位】：苏州科技大学江苏省结构工程重点实验室;中国地震局工程力学研究所;
【基金】：国家自然科学基金项目(No.51278323);国家自然科学基金重大研究计划集成项目(No.91215301)~~
【分类号】：P315.9

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