不同开采工艺条件下上覆地层破坏特征研究

Study on the Characteristics of Overlying Strata Failure under Different Mining Process Conditions

针对鲍店煤矿为浅埋特厚煤层的特点,采用理论分析分析上覆岩层破断力学条件,通过数值模拟的方法研究不同采煤工艺下煤层上覆岩层移动变形破坏特征。研究表明:在采高为2.8 m的情况下,采用顶分层开采,垮落带最大高度约为12.5 m,垮采比为4.48,导水裂缝带的最大发育高度约37.8 m,裂采比为13.5;两分层开采垮落带的最大发育高度为15.8 m,垮采比为2.72;三分层开采垮落带的最大发育高度为17.0 m,垮采比为1.93;网下综放开采时,垮落带最大发育高度约为27.5 m,垮采比约3.12;综放开采时,垮落带最大发育高度约为34.0 m,垮采比约为3.86。

In response to the characteristics of Baodian Coal Mine as a shallow buried and extremely thick coal seam,theoretical analysis is used to analyze the mechanical conditions of the overlying strata fracture,and numerical simulation is used to study the movement,deformation,and failure characteristics of the overlying strata under different mining techniques.Research has shown that at a mining height of 2.8 m,using top slicing mining,the maximum height of the collapse zone is about 12.5 m,the collapse mining ratio is 4.48,the maximum development height of the water conducting fracture zone is about 37.8 m,and the fracture mining ratio is 13.5;the maximum development height of the two layered mining collapse zone is 15.8 m,and the collapse mining ratio is 2.72;the maximum development height of the three layered mining collapse zone is 17.0 m,and the collapse mining ratio is 1.93;during the underground fully mechanized caving mining,the maximum development height of the collapse zone is about 27.5 m,and the collapse mining ratio is about 3.12;during fully mechanized top coal caving mining,the maximum development height of the collapse zone is about 34.0 m,and the collapse mining ratio is about 3.86.