贵州织金垮坡组滑坡成因分析及稳定性评价

强降雨诱发了大量的滑坡地质灾害,织金县垮坡组滑坡在强降雨后,坡体在后缘出现大量张拉裂缝以及两侧公路出现局部破坏之后发生了变形破坏。为了研究滑坡成因以及稳定性,在对现场进行详细调研以及查明变形破坏特征的基础上,对滑坡成因做出了详细分析,采用了定性分析、定量计算的方法对稳定性进行了研究。结果表明：垮坡组滑坡总方量14.95万m3,属于中型土质滑坡;坡体在自重状态、自重＋坡脚开挖状态下稳定系数分别为1.095、1.098,都处于基本稳定状态,在自重+暴雨、自重+暴雨+坡脚开挖状态下稳定性系数分别为0.711、0.722,都处于不稳定状态;强降雨是此次滑坡的主要诱发因素。

Genetic Analysis and Stability Evaluation of the Collapse Slope Landslide in Zhijin, Guizhou Province

Heavy rainfall induced a large number of geological disasters of landslides. After heavy rainfall, a large number of tensile cracks appeared in the back edge of the landslide of the collapse slope formation in zhijin county, and deformation and failure occurred after the local destruction of the highway on both sides.In order to study the cause of landslide and its stability, on the basis of a detailed investigation on the site and the identification of deformation and failure characteristics, the causes of landslide are analyzed in detail, and the stability is studied by means of qualitative analysis and quantitative calculation.The results show that the landslide volume of the collapse slope group is 149,500 m3, which belongs to medium soil landslide.The stability coefficients of the slope were 1.095 and 1.098 respectively in the dead weight state and the dead weight + toe excavation state, which were in the basic stable state. The stability coefficients were 0.711 and 0.722 respectively in the dead weight + rainstorm, and the dead weight + rainstorm + toe excavation state, which were in the unstable state.Heavy rainfall is the main factor causing the landslide.