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采用有限元数值模拟方法探讨了在SV波斜入射时,入射角度θ、入射方向和陡坎坡角α等参数变化对陡坎场地地表震动加速度峰值放大系数影响。结果表明:1)对x分量,从陡坎底部到陡坎顶部,放大系数逐渐增大,入射角度、坡角和入射方向没有影响;对z分量,放大系数分布规律相对复杂。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减小,z分量的放大系数随着入射角的增大而增大。4)地震波逆着陡坎方向(右)入射时,x分量放大系数随入射角的变化与输入波有关,但最大值基本在陡坎上侧边缘。z分量放大系数随入射角的增大而增大,最大值的位置无一致规律。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)入射时的小,z分量与之相反。
The effects of the parameters of the incident angle θ, the incident direction and the slope angle α on the peak amplification factor of ground vibration acceleration at steep ridge are studied by finite element method. The results showed that: 1) the x-components, from top to bottom scarp scarp, the amplification factor is gradually increased, the incident angle, slope angle and incident direction has no effect; z-component of the amplification factor distribution is relatively complex. 2) When the angle of incidence θ is constant, the magnification factor above the steep ridge is greater than the magnification factor below the steep ridge regardless of whether the seismic wave is incident along the direction of the steep ridge (left) or steeply (steeply). At the same time, the amplification factor increases with the increase of the slope angle α. 3) When the slope angle α is constant and the seismic wave is incident along the steep ridge (left), the amplification factor of the x component decreases with the increase of the incident angle. The amplification factor of the z component increases with the incident angle Big. 4) When the seismic wave is incident against the direction of the steep ridge (right), the amplification factor of the x component is related to the input wave with the incident angle, but the maximum value is basically at the upper edge of the steep ridge. z component magnification factor increases with the incident angle increases, the maximum value of the location of consistent law. 5) When the seismic wave is incident along the steep ridge (left), the amplification factor of the x component is smaller than when the seismic wave is incident against the steep ridge (right), with the z component being the opposite.