| 堆积层-基岩接触面滑坡的形成机理——以祖师庙滑坡为例 |
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| 引用本文： | 李鹏,苏生瑞,马驰,黄璜,徐继维.堆积层-基岩接触面滑坡的形成机理——以祖师庙滑坡为例[J].吉林大学学报(地球科学版),2017(5):1471-1479. |
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| 作者姓名： | 李鹏 苏生瑞 马驰 黄璜 徐继维 |
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| 作者单位： | 1. 长安大学地质工程与测绘学院,西安70054;国土资源部岩土工程开放研究实验室,西安710054;国土资源部黄土地质灾害重点实验室,西安710054;2. 长安大学地质工程与测绘学院,西安70054;3. 长安大学地质工程与测绘学院,西安70054;中煤西安设计工程有限责任公司,西安710054;4. 长安大学地质工程与测绘学院,西安70054;国土资源部黄土地质灾害重点实验室,西安710054 |
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| 基金项目： | 中央高校基本科研业务费项目，国土资源部黄土地质灾害重点实验室开放基金项目，四川交通建设科技项目，Supported by the Fundamental Research Funds for the Central Universities of China，Key Laboratory Program of the Key Laboratory for Geo-Hazards in Loess Area |
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| 摘 要： | 为了研究堆积层-基岩接触面滑坡的形成机理,以陕西省岚皋县广泛分布的堆积层-基岩接触面滑坡为研究对象,采用野外调查和数理统计的方法,总结了该类型滑坡的基本特征,并以祖师庙滑坡为例,借助室内试验和数值模拟手段,研究了堆积层-基岩接触面滑坡的形成机理。结果表明:1)堆积层-基岩接触面滑坡主要发育在坡度为20°~40°、下伏基岩为碎裂状结构的斜坡,多为浅表层滑坡;2)碎石土和堆积层-基岩接触面的内摩擦角随含水量增大而降低,堆积层-基岩接触面是斜坡变形破坏的软弱结构面;3)细颗粒物质的增加降低了堆积层-基岩接触面的内摩擦角,且细颗粒粒径越小,内摩擦角也越小,在饱和状态下降幅度越大;4)因细颗粒物质在堆积层-基岩接触面处聚集造成的强度降低和因水文地质条件改变造成的滑带土饱和是祖师庙滑坡主要的诱发因素。研究结果对揭示堆积层-基岩接触面滑坡的形成机理和地质灾害防治具有一定的指导意义。
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| 关 键 词： | 堆积层-基岩接触面 滑坡 碎石土 软弱结构面 岚皋县 形成机理 |
Formation Mechanism of Landslides with Accumulation Layer-Bedrock Contact Surface:Taking Zushimiao Landslide as an Example |
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| Abstract: | In order to research the mechanism of the landslides with accumulation layer-bedrock contact surface,which are widely distributed in Langao County,Shaanxi Province,the authors summarized the basic characteristics of the landslides through field investigation,laboratory test and numerical simulation,and mathematical statistics by taking the Zushimiao landslide as an example.The formation mechanism of landslide with accumulation layer-bedrock contact surface is concluded as follows:1) The landslides with accumulation layer-bedrock contact surface are mainly developed in the slopes with 20°-40° gradient and their underlying bedrock fragmented,mostly the shallow surface landslides;2) The internal friction angle of gravel soil and the accumulation layer-bedrock contact surface decreases with the increasing of the water content,and the contact surface is the weak structural plane of the slope deformation;3) The increase of fine particles reduces the internal friction angle of the contact surface,and the smaller the particle diameter is,the smaller the internal friction angle,and the greater the decrease in the saturated state;4) The strength decrease caused by the small particle soil at the interface between accumulation layer and bedrock and the saturation of slip zone soil caused by the change of hydro-geological conditions are the main predisposing factors of the Zushimiao landslide.The research results have certain guiding significance for revealing the formation mechanism of landslide and the prevention and control of geological hazards. |
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| Keywords: | accumulation layer-bedrock contact surface landslide gravel soil weak structural plane Langao County formation mechanism |
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