康定Ms5.8级地震冷竹关坡体内地震动响应特征

王运生; 贺建先; 罗永红; 郝子皓; 刘勇; 张磊

doi:10.3969/j.issn.0258-2724.2015.05.011

康定Ms5.8级地震冷竹关坡体内地震动响应特征

doi: 10.3969/j.issn.0258-2724.2015.05.011

基金项目:

国家自然科学基金资助项目(41072231)

中国地调局地质调查工作项目(12120113010100)

详细信息

作者简介:
王运生(1960-),男,教授,博士,研究方向为地质灾害,电话:028-84073563,E-mail:wangys60@163.com

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出版历程
- 收稿日期: 2015-04-13
- 刊出日期: 2015-10-25

Seismic Responses of Lengzhuguan Slope During Kangding Ms5.8 Earthquake

摘要

摘要: 为了揭示坡体内不同水平深度峰值加速度变化特征及地震触发大型滑坡形成机理,在冷竹关沟两岸安置强震监测台阵,对斜坡内部不同深度地震动响应进行监测研究.2014年11月25日康定Ms5.8级地震触发了位于坡体内部不同深度的五台强震监测仪,数据揭示:自坡体表面水平向内,各监测点水平向峰值加速度逐渐减小,且0~45 m的表层向内峰值加速度下降幅度较大,在坡体内部的下降幅度变小,洞深99 m处的水平向峰值加速度约为洞口监测仪的60%;水平向加速度反应谱也表明自坡面向内各监测点加速度幅值逐渐减小,标准反应谱的动力放大系数都小于3.5;傅里叶频谱也表明自坡面向内各监测点幅值逐渐减小,且越靠近洞口傅氏谱频率成分越复杂.
- 斜坡地震动响应 /
- 衰减规律 /
- 加速度反应谱 /
- 傅氏谱 /
- 冷竹关
Abstract: In order to reveal the characteristics of the peak acceleration at different depths of a slope and seismic landslide formation mechanism, a strong earthquake monitoring array was set up in both sides of the Lengzhuguan slope. Five strong vibrograph at different depths but the same altitude were triggered by Kangding Ms 5.8 earthquake occurred on December 25th, 2014. The data reveals that the horizontal peak acceleration at each monitoring site decreases with the increase of depth. It decreases greatly within the surface range of 0 to 45 m and at the inner slope falls at a slow rate. At the monitoring site (99 m from the hole) the horizontal peak acceleration is about 0.6 times the one at the hole. The acceleration response spectrum shows that the amplitudes at monitoring sites decay with the increase of the depth, and the dynamic magnification factor of standard spectra is less than 3.5. Fourier spectrum shows that the amplitudes also decrease gradually from the outside hole to the inside slope, and near the hole, the components of the spectrum become complex.
- slope seismic response /
- attenuation rule /
- acceleration response spectrum /
- Fourier spectrum /
- Lengzhuguan section

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