基于深部位移监测的滑坡形成机制分析与稳定性评价

Analysis of a landslide mechanism and its stability evaluation based on subsurface displacement monitoring

采用钻孔深部位移监测法,结合工程地质调绘、地表变形监测和室内土工试验,研究了某金矿堆渣体引起潜在滑坡的形成机制,对该潜在滑坡的稳定性进行了分析评价。监测和分析结果表明:该潜在滑坡体存在浅层和深层两个潜在滑动面,潜在滑动面呈弧状,埋深从坡体后缘到前沿逐渐减小;厂区岩土体条件较差,地下水位埋深较浅以及厂房后缘大量堆渣体是发生潜在滑坡体的主要原因;监测结果揭示潜在滑坡体后部变形明显,累计变形量较大,处于加速变形阶段,中部虽未表现出加速变形状态,但变形速率比较大,前部变形速率较小,整体处于极限平衡状态,与稳定性定量计算结果相符。该方法更加清晰地揭示了潜在滑坡体的变形特征,与实际情况比较吻合,可为潜在滑坡稳定性评价与滑坡灾害防治提供科学依据,对类似工程也具有一定的借鉴意义。

This paper using deep displacement monitoring, combining with engineering geological mapping, surface deformation monitoring and soil test, research of the formation mechanism of a potential landslide in a gold mine, evaluating it＇ s stability. Monitoring and analysis results show, the landslide has deep and shallow sliding surfaces, and the slip surface rendered as arc shape, the burial depth gradually decreases from trailing edge to leading edge; The bad rock and soil conditions, shallow groundwater level and large number of slag pile behind factory buildings are the main reasons of the potential landslide; Monitoring results shows that it has obvious deformation at the rear of the landslide, the cumulative deformation are larger, in a deformed acceleration phase, the central not showing accelerated state, but it has larger deformation rates, the front part has smaller deformation rates, overall are in limit equilibrium state, the results are consistent with the stability calculation. This method to more clearly reveal the deformation characteristics of the potential landslide, it has a good match with the actual situation, This reseach method not only provide a scientific basis to the stability evaluation and prevention of the potential landslide, but also will be having some references significance to similar projects.