| 1920年海原地震滑坡密集区的地震动场地效应研究 |
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| 引用本文： | 卢育霞,魏来,刘琨,李桐林,郑海忠,王常亚,杨博.1920年海原地震滑坡密集区的地震动场地效应研究[J].西北地震学报,2020,42(5):1151-1158. |
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| 作者姓名： | 卢育霞 魏来 刘琨 李桐林 郑海忠 王常亚 杨博 |
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| 作者单位： | 中国地震局黄土地震工程重点实验室, 甘肃 兰州 730000;甘肃省岩土防灾工程技术研究中心, 甘肃 兰州 730000;中国地震局兰州岩土地震研究所, 甘肃 兰州 730000;贵州省交通规划勘察设计研究院股份有限公司, 贵州 贵 阳 550008 |
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| 基金项目： | 国家重点研发计划项目课题（2017YFC1500900）；中国地震局地震预测研究所基本科研业务费项目（2020IESLZ03） |
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| 摘 要： | 地震动作为引起地震灾害的原动力，常常通过造成建筑物倒塌、山体滑坡等形式引起大量人员伤亡和财产损失。1920年海原8½级地震，在震中距80 km远的西吉—静宁交界的黄土丘陵区引发了大量的山体滑坡，并造成重大人员伤亡和财产损失。在分析海原地震高烈度区滑坡分布特征的基础上，通过场地调查和数值计算等方法，研究典型滑坡密集场地的地质条件及地震反应特征。研究表明起伏地形和黄土厚度不均等因素造成丘陵山体两侧地震反应的差异，从而导致地震滑坡在斜坡土体较厚的一侧成群连片发育。海原地震造成的滑坡密集区的地形地貌、岩土性质、土层结构等条件决定了该地区地震动随局部场地条件变化非常迅速，地层场地效应和地形场地效应联合作用加剧了斜坡地表的地震动放大作用，增加了触发地震滑坡的动力。
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| 关 键 词： | 海原大地震 地震滑坡 场地效应 黄土地区 地面运动 |
| 收稿时间： | 2020/7/10 0:00:00 |
Site Effects of Ground Motions in Landslide-Concentrated Area Caused by the Haiyuan Earthquake in 1920 |
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| LU Yuxi,WEI Lai,LIU Kun,LI Tonglin,ZHENG Haizhong,WANG Changy,YANG Bo.Site Effects of Ground Motions in Landslide-Concentrated Area Caused by the Haiyuan Earthquake in 1920[J].Northwestern Seismological Journal,2020,42(5):1151-1158. |
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| Authors: | LU Yuxi WEI Lai LIU Kun LI Tonglin ZHENG Haizhong WANG Changy YANG Bo |
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| Institution: | Key Laboratory of Loess Earthquake Engineering of China Earthquake Administration, Lanzhou 730000, Gansu, China;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, Gansu, China;Lanzhou Institute of Geotechnique and Earthquake, CEA, Lanzhou 730000, Gansu, China;Guizhou Transportation Planning Survey&Design Academe Co. LTD, Guiyang 550008, Guizhou, China |
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| Abstract: | Strong ground motions, the direct inducement of all kinds of earthquake disasters, usually cause considerable casualties and property loss through building collapse and earthquake landslides. The M8.5 Haiyuan earthquake of 1920 triggered numerous loess landslides and caused heavy casualties in the loess hilly area at the junction of Xiji and Jingning Counties, 80 km from the epicenter. Based on the analysis of the landslide distribution characteristics in the Haiyuan earthquake high-intensity area, the geological conditions and seismic response characteristics of typical sites in the landslide-concentrated area were studied by field investigation and numerical calculation. It is concluded that the topographical differences and the overburden on both sides of the loess hill lead to different ground-motion amplification effects, which is one of the factors leading to the successive occurrences of landslides on one side of the hill. The topography, geotechnical property, and soil layer structure of the landslide-concentrated area show that the ground motion in this area rapidly changes with local site conditions. The combined action of stratigraphic site effect and topographic site effect intensifies the ground-motion amplification of the slope surface and increases the seismic force of triggering landslides. |
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| Keywords: | Haiyuan earthquake seismic landslide site effect loess region ground motion |
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