冯家塔矿区高陡坡体采动损害演化机理分析

Analysis on High Steep Slope Body Damage Evolution Mechanisms by Mining in Fengjiata Mining Area

冯家塔矿区地表沟壑纵横切割,煤层埋藏浅,在采动影响下地质灾害频发。结合冯家塔矿区的地形、地质条件,重点分析了开采沉陷导致高陡坡体发生失稳破坏的机理。分析结果表明,该矿区沟坡陡峭、地形变化大,沟坡两侧岩层风化严重、节理裂隙发育、岩土体抗压强度较低,地下开采改变了覆岩和地表边坡原始应力平衡状态,这3种因素共同构成了高陡坡体发生失稳崩塌的地形、物质和动力条件,导致了矿区地质灾害频发。

The surface is cut crossly with gullies and the coal seam is buried shallowly in Fengjiata mining area. The geological disasters happened frequently under the influence of mining. According to the topography and geological conditions of Fengjiata mining area,this paper mainly analyzed the buckling failure evolution mechanisms of high steep slope body caused by mining subsidence. Analytical result showed that,firstly,ditch is precipitous and terrain changes fast in the mining area; secondly,rock weathering is serious on both sides of the ditch,joint crack is developing,the compressive strength of geotechnical engineering is poor; thirdly,underground exploit changed the balanced state of the original stress in the strata and surface side slope. These reasons form terrain,substance,powerful condition that the high steep slope body happened unstability collapse,so the geological disasters happened frequently in the mining area.