蒙东地区露天矿风成砂边坡滑坡模式及变形机理研究

Study on landslide mode and deformation mechanism of aeolian sand slope landslide in open-pit coal mine of eastern Inner Mongolia

基于蒙东地区露天煤矿分布的广泛性以及风成砂、软岩发育的普遍性;针对由风成砂和软岩这2种力学强度较低的岩层所构成的风成砂边坡的特点,选取呼伦贝尔沙地典型露天煤矿风成砂边坡为研究对象,建立蒙东地区露天煤矿风成砂边坡模型,基于岩土工程特性分析并采用数值模拟方法;充分分析风成砂边坡的演化模式,确定滑坡为受自身重力及风成砂特性影响的圆弧形滑动模式,并进行滑坡变形机理探究;提出风成砂边坡滑坡具有孕育演化、滑坡蠕动形变、滑坡速滑失稳3个变形阶段。

Based on the universality of the distribution of open-pit coal mines and the development of aeolian sand and soft rock in eastern Mongolia,in view of the particularity of the aeolian sand slope composed of two rock layers with low mechanical strength,namely,aeolian sand and soft rock,the article selects the typical open-pit coal mine eolian sand slope in Hulunbei'er sandy land,andestablishes the aeolian sand slope model.Based on the analysis of geotechnical engineering characteristics,the numerical simulation method is used to fully analyze the evolution mode of eolian sand slope.The article determines landslide to be a circular arc sliding mode,which is affected by its own gravity and the characteristics of eolian sand,and explores the deformation mechanism of landslide,and presents three deformationstages of aeolian sand slope:incubation and evolution,creep deformation,speed sliding instability of the landslide.