高陡边坡地震动放大效应分析
发布时间：2019-01-23 14:41
【摘要】：为了研究高陡岩质边坡对地震动加速度峰值的放大作用,分别针对简谐波和El Centro波竖向入射高陡边坡的情形,基于动力学模拟研究了坡肩和坡表面放大系数与坡高和坡比的参数关系。根据计算结果绘制边坡剖面的水平向和竖向放大系数等值线图,分析了坡体内放大系数分布特征。结果表明:放大系数并不随着坡高的递增而持续增大,放大系数的最大值出现在坡肩,在不超过2.0的范围内波动变化。坡顶面上的放大系数随着坡肩距的增大而逐渐衰减。坡体内水平向与竖向放大系数的空间分布特征显著不同,在邻近坡肩和斜坡面的区域内竖向放大系数可高达1.5,高陡边坡的抗震设计中不可忽略竖向放大系数的影响。
[Abstract]:In order to study the effect of the high and steep slope on the peak of ground motion acceleration, the parametric relation between the slope and the slope height and the slope ratio is studied on the basis of the dynamics simulation for the case of the vertical incidence of the high and steep slope of the simple harmonic and the El Centro wave, respectively. The horizontal and vertical magnification factor of the slope profile is plotted according to the calculated results, and the distribution characteristics of the amplification factor in the slope are analyzed. The results show that the amplification factor is not continuously increased with the increasing of the slope, and the maximum value of the amplification factor appears on the slope shoulder and fluctuates in the range of not more than 2.0. The amplification factor on the top of the slope gradually attenuates with the increase of the shoulder pitch. The spatial distribution characteristics of the horizontal and vertical amplification factors in the slope are significantly different, and the vertical amplification factor can be up to 1. 5 in the area adjacent to the slope and the slope surface, and the effect of the vertical magnification factor can not be neglected in the seismic design of the high and steep slope.
【作者单位】： 中国科学院武汉岩土力学研究所;
【基金】：国家杰出青年科学基金项目(51025935)
【分类号】：TV223
本文编号：2413907
[Abstract]:In order to study the effect of the high and steep slope on the peak of ground motion acceleration, the parametric relation between the slope and the slope height and the slope ratio is studied on the basis of the dynamics simulation for the case of the vertical incidence of the high and steep slope of the simple harmonic and the El Centro wave, respectively. The horizontal and vertical magnification factor of the slope profile is plotted according to the calculated results, and the distribution characteristics of the amplification factor in the slope are analyzed. The results show that the amplification factor is not continuously increased with the increasing of the slope, and the maximum value of the amplification factor appears on the slope shoulder and fluctuates in the range of not more than 2.0. The amplification factor on the top of the slope gradually attenuates with the increase of the shoulder pitch. The spatial distribution characteristics of the horizontal and vertical amplification factors in the slope are significantly different, and the vertical amplification factor can be up to 1. 5 in the area adjacent to the slope and the slope surface, and the effect of the vertical magnification factor can not be neglected in the seismic design of the high and steep slope.
【作者单位】： 中国科学院武汉岩土力学研究所;
【基金】：国家杰出青年科学基金项目(51025935)
【分类号】：TV223
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