贵州黔西市仓堡田滑坡变形特征及成因分析

贵州省黔西市中坪镇2020年7月相继发生2起规模较大的红层滑坡地质灾害，其中之一的仓堡田滑坡变形破坏特征与四川盆地缓倾顺向的红层滑坡具有差异性。本文通过详细的野外调查、变形监测、钻探取样等手段，研究了仓堡田滑坡变形破坏特征、变形时序及监测曲线变化特征，分析了该滑坡的形成因素。研究结果表明，仓堡田滑坡为规模约800万m3的大型推移式滑坡，其变形破坏后形成左右两个变形速率和位移量不同的次级滑体，滑坡前缘稳定后，后缘部分在持续缓慢变形，其变形破坏主要受前缘小冲湾河谷切割、松散破碎的岩土体结果及持续强降雨导致滑面软化、重度增加等因素的影响。

Deformation characteristics and cause analysis of Cangbaotian Landslide in Qianxi City, Guizhou

In July 2020, two large-scale geological disasters occurred in Qianxi City, Guizhou Province, one of them is the Cangbaotian landslide. The deformation and failure characteristics of Cangbaotian landslide are different from those of the gently dipping red-bed landslide in Sichuan Basin. In this paper, by means of detailed field investigation, deformation monitoring and drilling sampling, the deformation and failure characteristics, deformation sequence and monitoring curve variation characteristics of the landslide are studied, and the formation factors of the landslide are analyzed. The research results show that the landslide is a large displacement landslide with a scale of about 8 million m3, and two secondary sliding bodies with different deformation rates and displacements are formed after deformation and failure. After the front edge of the landslide is stabilized, the back edge continues to slowly deform. The deformation failure is mainly affected by the cutting of valley in front, the result of loose broken rock and soil mass, and the softening of the sliding zone and increasing of the weight caused by continuous heavy rainfall.