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研究浅埋薄基岩煤层开采后在采空区上方形成的导水裂隙带范围对保水开采具有重要意义。基于煤层开采后地表移动和岩体内部移动的内在联系,采用随机介质方法,将地表移动的基本参数应用于岩体内部移动规律的研究中,建立了上覆岩层移动变形力学模型,推导了煤层开采后采空区上方岩层内的位移、应变和应力的数学表达式,分析了上覆岩层变形破坏的影响因素和破坏力学机理。在此基础上,给出了浅埋薄基岩煤层开采覆岩隔水层的破坏判据,为浅埋薄基岩煤层保水开采提供理论依据。
It is of great significance to study the range of water-conducting fractured zone formed above goaf in shallow-thickness thin-bedded coal seam after mining. Based on the inherent relationship between surface movement and internal movement of rock mass after coal mining, the random medium method was used to apply the basic parameters of surface movement to the study of internal movement of rock mass. The mechanical model of overlying rock movement was established and the coal seam The mathematical expressions of displacement, strain and stress in the rock strata above the mined-out area after mining are analyzed, and the influencing factors and failure mechanics mechanism of the overlying rock strata deformation and failure are analyzed. On this basis, the failure criterion of overburden strata mining in shallow-buried thin bedrock coal seam is given, which provides a theoretical basis for water-bearing mining of shallow buried-bedrock coal seam.