| 海原大地震诱发石碑塬黄土滑坡机制探讨 |
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| 引用本文： | 杨博,田文通,孙军杰,刘琨,徐舜华.海原大地震诱发石碑塬黄土滑坡机制探讨[J].西北地震学报,2020,42(5):1165-1172. |
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| 作者姓名： | 杨博 田文通 孙军杰 刘琨 徐舜华 |
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| 作者单位： | 中国地震局兰州地震研究所 中国地震局(甘肃省)黄土地震工程重点实验室, 甘肃 兰州 730000;中国地震局兰州地震研究所 中国地震局(甘肃省)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;兰州理工大学 土木工程学院, 甘肃 兰州 730050;温州大学 建筑工程学院, 浙江 温州 325035 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务费项目（2017IESLZ06，2019IESLZ04）；中国地震局地震科技星火计划（XH18049SX）；国家自然科学基金项目（51779234） |
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| 摘 要： | 1920年海原8.5级大地震诱发的石碑黄土塬滑坡，因其规模大、坡度小、滑距远的特点成为业界关注焦点，目前对该滑坡的物理力学过程仍无统一认识。基于此，文章通过理论分析和数值计算方法研究该滑坡初始状态、地震动力响应和流滑发展过程。为分析震前斜坡初始状态，建立考虑斜坡表面拉裂缝中侧向水压力作用的力学计算模型。结果表明，拉裂缝中侧向水压力削弱了斜坡整体稳定状态；为研究地震时斜坡动力响应过程，建立数值计算模型，获得地震时斜坡饱和土层的孔隙水压力比和斜坡位移的变化特性；为解释远程滑坡，将液化后土层等效为流体，借鉴泥流滑距估算理论，求算石碑塬滑坡的滑距，计算结果与前人现场考察结果吻合。
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| 关 键 词： | 海原大地震 石碑塬滑坡 滑移机制 液化 滑距 |
| 收稿时间： | 2020/7/10 0:00:00 |
Mechanism of Shibeiyuan Loess Landslide Induced by the Haiyuan Earthquake |
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| YANG Bo,TIAN Wentong,SUN Junjie,LIU Kun,XU Shunhua.Mechanism of Shibeiyuan Loess Landslide Induced by the Haiyuan Earthquake[J].Northwestern Seismological Journal,2020,42(5):1165-1172. |
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| Authors: | YANG Bo TIAN Wentong SUN Junjie LIU Kun XU Shunhua |
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| Institution: | Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China;Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou 730000, Gansu, China;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, Gansu, China;School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, Zhejiang, China |
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| Abstract: | The Shibeiyuan landslide induced by the Haiyuan MS8.5 earthquake of 1920 has become a research focus because of its large scale, small slope angle, and long sliding distance. At present, there is no unified understanding of the physical and mechanical processes of the landslide. In this study, the initial state, seismic dynamic response, and flow slip development process of the landslide are investigated by theoretical analysis and numerical calculation. To analyze the initial state of the slope before the earthquake, a mechanical model and a slope stability evaluation model considering the action of lateral water pressure in the slope surface tension cracks are established. The results show that the lateral water pressure in the tension fracture weakens the slope overall stability. To study the dynamic response process of the slope under earthquake, a numerical calculation model is established, and the variation characteristics of pore pressure ratio and the slope displacement of saturated soil layer during earthquake are obtained. To explain the long-distance landslide, the liquefied soil layer is made equivalent to a fluid layer, and the slip distance of the Shibeiyuan landslide is calculated using the estimation theory of mudflow slip distance. The calculation results are consistent with previous field investigation results. |
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| Keywords: | Haiyuan earthquake Shibeiyuan landslide slip mechanism liquefaction slippage |
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