贵州发耳煤矿尖山营滑坡特征及成因机制

高陡边坡地形条件进行煤层开采,极易引发地质灾害问题,给地质环境造成很大的破坏。以贵州发耳煤矿三采区的尖山营边坡为研究对象,查明了采空区分布情况及斜坡裂缝体系发育规律,结合该矿区地形地貌特征,分析该滑坡特征及影响因素,总结开采沉陷诱发山体滑坡的成因机制。结果表明:煤层开采后,上覆岩层发生应力重分布,采空区边界形成拉应力集中区;上覆岩层产生以沉降为主的弯曲变形,而在坡肩和坡脚部位产生较明显水平向外位移;变形过程中先在采空区后边界部位产生裂缝,回采煤柱后,裂缝贯通,形成潜在滑面,该滑坡变形机制为塌落沉陷-拉裂-蠕滑。

Study on the Characteristics and Genesis Mechanism of Jianshanying Landslide in Faer coal mine,Guizhou Province

the coal seam mining under the topographic conditions of high and steep slope is easy to cause geological disaster and cause great damage to the geological environment.Based on the study object of jianshanying slope in the third mining area of guizhou faye coal mine, this paper finds out the distribution of goaf and the development law of slope fracture system, analyzes the characteristics and influencing factors of the landslide based on the topographic and geomorphic characteristics of the mining area, and summarizes the genesis mechanism of the subsidence induced landslide.The results show that: after coal mining, stress redistribution occurs in overlying strata and tensile stress concentration area is formed at goaf boundary.The overlying strata produce the bending deformation which is mainly subsidence and the lateral displacement is obvious at the shoulder and foot of the slope.In the process of deformation, cracks are first generated at the boundary position behind the goaf. After coal pillar mining, the cracks break through and form potential slip surface. The deformation mechanism of the landslide is caving subsidence, pulling crack, creep slip and shear slip.