Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (5): 1471-1479.doi: 10.13278/j.cnki.jjuese.201705201

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Formation Mechanism of Landslides with Accumulation Layer-Bedrock Contact Surface:Taking Zushimiao Landslide as an Example

Li Peng1,2,3, Su Shengrui1, Ma Chi1,4, Huang Huang1, Xu Jiwei1,3   

  1. 1. College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
    2. Open Research Laboratory of Geotechnical Engineering, MLR, Xi'an 710054, China;
    3. Key Laboratory for Geo-Hazards in Loess Area, MLR, Xi'an 710054, China;
    4. China Coal Xi'an Design Engineering Co., LTD., Xi'an 710054, China
  • Received:2016-12-15 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by the Fundamental Research Funds for the Central Universities of China(310826151048),Key Laboratory Program of the Key Laboratory for Geo-Hazards in Loess Area, MLR(KLGLAMLR201506)and Sichuan Transportation Construction Science and Technology Project(2015A1-3)

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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.

Key words: accumulation layer-bedrock contact surface, landslide, gravel soil, weak structural plane, Langao County, formation mechanism

CLC Number: 

  • P642.21
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