基于多源数据的矿山边坡滑坡成因分析

针对某露天矿开采过程中边坡滑坡问题，采用无人机倾斜摄影测量与工程勘察联合调查的方式，基于多源数据对边坡滑坡的基本前兆特征及地质特征进行分析判断。结果表明，边坡滑坡的根本原因是开采形成高陡边坡后，边坡不良岩土体在应力重分布过程中向临空面方向产生塑性挤压变形，导致上覆岩层产生陡倾张裂隙；边坡滑坡变形的模式以蠕滑 拉裂的变形模式（表层蠕滑 后缘拉裂 潜在剪切面剪切）为主，破坏形式以滑塌为主；边坡潜在滑移面将在极软 软弱岩土层中发育；结合灰岩的分布特征判断，如边坡发生最终破坏，将以中浅层滑坡为主，滑动带深度多在20 m以内，滑坡后缘在新老裂缝发育区，剪出口位于+250 m平台以上。结果为边坡稳定性控制工作提供了理论依据。

Cause Analysis of Mine Slope Landslide Based on Multi source Data

Aiming at the problem of slope landslide in the process of mining in an open pit mine,the method of joint survey of drone tilt photogrammetry and engineering survey was adopted,and the basic precursor characteristics and geological characteristics of slope landslide were analyzed and judged based on multi source data.The results show that the root cause of the slope landslide is that after the high steep slope is formed by mining,the unfavorable rock and soil mass of the slope produces plastic deformation toward the empty surface during the stress redistribution process,which leads to the formation of steeply inclined tension cracks in the overlying rock.The deformation mode of the slope landslide is mainly creeping tensile deformation (surface creeping trailing edge tensile potential shear surface shear),and the main failure mode is slumping.The potential slip surface of the slope will develop in the extremely soft weak rock and soil layer.According to the distribution characteristics of limestone,if the slope is finally damaged,the middle shallow landslides will be the main ones.The depth of the sliding zone is mostly within 20 m.The trailing edge of the landslide is in the area where new and old fractures are developed,the cutting exit is located above the +250 m platform.The results provide a theoretical basis for slope stability control.