贵州水城县尖山营滑坡破坏机制及稳定性分析

Failure Mechanism and Stability Analysis of Jianshanying Landslide in Shuicheng County,Guizhou Province

为对尖山营滑坡变形破坏机制及稳定性进行研究,结合收集的资料和现场调查情况综合分析,运用构造地质学、数值模拟、无人机等手段方法展开研究。结果表明:尖山营滑坡纵长480 m,横宽250 m,面积约1.1×105 m2,滑坡体量约5.5×105 m3,属中型浅层滑坡;滑坡体在多年煤层采动影响下,坡体较破碎且出现大量裂缝,持续强降雨渗入降低了滑带的抗剪强度,增加了坡体内的静水压力和动水压力,从而促进滑坡体向前缘临空面发生滑动,其变形破坏模式为蠕滑-拉裂型;利用FLAC3D数值模拟分析,对滑坡的稳定性进行评价,得到其在天然和暴雨两种工况下的稳定性系数及剪应变增量云图。

In order to study the deformation and failure mechanism and stability of Jianshanying landslide,combined with the data collected and the comprehensive analysis of the field investigation,structural geology,numerical simulation,unmanned aerial vehicle and other methods were used to carry out the study.The results show that the Jianshanying landslide is a medium shallow landslide with a longitudinal length of 480 m,a transverse width of 250 m,an area of 1.1×105 m2 and a landslide volume of 5.5×105 m3.Under the influence of coal mining for many years,the slope is relatively broken and a large number of cracks appear.The continuous heavy rainfall infiltrates into the low shear strength of the slide zone and increases the hydrostatic pressure and hydrodynamic pressure in the slope body,thus promoting the sliding of the forward edge of the landslide.The deformation and failure mode of the landslide body is creep slip-tensile type.By using FLAC3D numerical simulation analysis,the stability of the landslide was evaluated,and the stability coefficient and shear strain increment nephogram under natural and rainstorm conditions were obtained.