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Formation and characteristics of the Xiaoba landslide in Fuquan, Guizhou, China

机译：贵州福泉小巴滑坡的形成与特征

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摘要

On August 27, 2014, a large-scale landslide occurred in Fuquan, Guizhou, China. This high-speed landslide caused considerable destruction; 23 people were killed, 22 were injured, and 77 houses were damaged. Field investigations, deformation monitoring, and numerical analyses have been performed to examine the characteristics and formation processes of this landslide. In the Xiaoba area, the slope showed a two-layered structure with a hard upper layer and a soft lower layer. Dolomite of the Dengying Formation in the slope front formed a locked segment controlling slope stability. Based on deformation and failure characteristics, the landslide is divided into sliding source area A and accumulation area B. The landslide is also divided into the following stages: bedding slip, tension cracking at the slope scarp, and the appearance of the locked section at the slope toe. Numerical calculations show that excavation led to maximum shear strain concentration along the interface of siltstone and slate in the middle of the slope, which became a potential sliding surface. Stress concentration and distribution of the plastic zone of the locked segment of the Dengying Formation dolomite occurred in the slope toe. Continuous rainfall caused the groundwater level to rise in the Xiaoba slope. The unfavorable geological structure was a determinant factor, and the combined effects of excavation and continuous rainfall were triggering factors that induced the landslide. The geomechanical mode for the Xiaoba landslide is sliding tension-shear failure.
机译：2014年8月27日，贵州福泉发生了大规模滑坡。这种高速滑坡导致相当大的破坏; 23人被杀死，22人受伤，77所房屋受损。已经进行了现场调查，变形监测和数值分析，以检查这种滑坡的特性和形成过程。在小波地区，斜坡展示了一种具有硬上层和柔软的下层的双层结构。斜坡前部的Dolomite形成锁定段控制边坡稳定性。基于变形和故障特性，滑坡被分成滑动源区域A和累积区域B.山体滑坡也分为以下阶段：坡道滑动，斜坡围巾的张力开裂，以及锁定部分的外观斜坡脚趾。数值计算表明，挖掘导致沿硅铁晶界面的最大剪切应变浓度，斜坡中间的斜面，成为潜在的滑动表面。斜坡脚趾的锁定区段的锁定区段的塑料区的应力集中和分布发生在斜坡上。连续降雨导致地下水位升起的萧兆坡。不利的地质结构是一种决定因素，挖掘和连续降雨的综合影响是触发诱导山体滑坡的因素。小波滑坡的地质力学模式是滑动张力剪切失效。

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  • 来源
    《Landslides》 |2018年第4期|共13页
  • 作者

    Lin F.; Wu L. Z.; Huang R. Q.; Zhang H.;

  • 作者单位

    Chengdu Univ Technol State Key Lab Geohazard Prevent &

    Geoenvironm Chengdu 610059 Sichuan Peoples R China;

    Chengdu Univ Technol State Key Lab Geohazard Prevent &

    Geoenvironm Chengdu 610059 Sichuan Peoples R China;

    Chengdu Univ Technol State Key Lab Geohazard Prevent &

    Geoenvironm Chengdu 610059 Sichuan Peoples R China;

    Chengdu Univ Technol State Key Lab Geohazard Prevent &

    Geoenvironm Chengdu 610059 Sichuan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 崩塌;
  • 关键词

    Xiaoba landslide; Excavation; Rainfall; Locked segment; Geomechanical model;

    机译：小波滑坡;挖掘;降雨;锁定段;地质力学模型;

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