深厚覆盖层中地震动传播规律离心模拟试验研究
发布时间：2019-02-09 20:44
【摘要】：深厚覆盖层上高土石坝抗震问题一直是土石坝抗震研究领域的热点之一,而地震动在覆盖层中传播规律研究是其重要组成部分,为揭示地震在覆盖层中的传播机理,本文开展了离心机振动台试验,分别研究了输入加速度峰值、土层特性对于地震动在其中传播规律的影响。研究发现,地震动经覆盖层传播后,低频成分被放大,高频被抑制,且随着输入地震动峰值增加,地震动加速度峰值放大倍数逐渐减小,而对于相同的地震动输入,加速度峰值放大倍数随着土体剪切刚度的增加而逐渐变大。
[Abstract]:The seismic problem of high earth-rockfill dam on deep overburden is one of the hotspots in the field of earth-rock dam aseismic research, and the research on the law of ground motion propagation in the overburden is an important part of it, in order to reveal the mechanism of earthquake propagation in the overburden. In this paper, the shaking table test of centrifuge is carried out, and the effects of peak input acceleration and soil layer characteristics on the propagation of ground motion are studied respectively. It is found that after the ground motion propagates through the overburden, the low frequency component is amplified, the high frequency is suppressed, and with the increase of the peak value of the input ground motion, the amplification factor of the peak acceleration of the ground motion decreases gradually, but for the same ground motion input, The peak magnification of acceleration increases with the increase of soil shear stiffness.
【作者单位】： 中国水利水电科学研究院;
【基金】：中国水利水电科学研究院基本科研业务费专项项目(GE0145B102017)
【分类号】：TV312;TV641.1
本文编号：2419375
[Abstract]:The seismic problem of high earth-rockfill dam on deep overburden is one of the hotspots in the field of earth-rock dam aseismic research, and the research on the law of ground motion propagation in the overburden is an important part of it, in order to reveal the mechanism of earthquake propagation in the overburden. In this paper, the shaking table test of centrifuge is carried out, and the effects of peak input acceleration and soil layer characteristics on the propagation of ground motion are studied respectively. It is found that after the ground motion propagates through the overburden, the low frequency component is amplified, the high frequency is suppressed, and with the increase of the peak value of the input ground motion, the amplification factor of the peak acceleration of the ground motion decreases gradually, but for the same ground motion input, The peak magnification of acceleration increases with the increase of soil shear stiffness.
【作者单位】： 中国水利水电科学研究院;
【基金】：中国水利水电科学研究院基本科研业务费专项项目(GE0145B102017)
【分类号】：TV312;TV641.1
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