School of Energy Science and Engineering,Henan Polytechnic University

为更深入了解特厚煤层大采高开采覆岩运动与矿压显现特征,采用数值模拟以及现场矿压监测方法,分析了大柳塔煤矿大采高开采覆岩移动、矿压显现以及支架工作阻力特征。结果表明:支架顶梁应力振幅可用于判断采场支架来压状态和覆岩破断剧烈程度;工作面推进50 m处基本顶小范围分层破坏;爆破预裂使基本顶形成不对称拱结构,拱结构破坏使基本顶岩层内水平应力减小,垂直应力升高,形成工作面初次来压,来压步距88 m;基本顶上部铰接结构使基本顶岩层内水平应力升高,垂直应力降低,下部悬臂结构破断导致第2次来压,来压步距25 m;铰接结构破坏使基本顶岩层内水平应力和垂直应力均升高导致第3次来压,来压步距20 m;基本顶拱结构和铰接结构失稳引起来压强烈,覆岩破断延伸至地表。

In order to deeply understand the overburden strata movement and mine strata pressure behavior features,the numerical simulation and the site mine str ata pressure monitoring and measuring method were applied to analyze the overburden strata movement,mine strata pressure behavior and the powered support worki ng resistance features of the high cutting coal mining face in Daliuta Mine. The results showed that the canopy stress amplitude of the hydraulic powered support could be applied to judge the pressurized state of the powered support in the coal mining face and the serious degree of the overburden strata breakdown.When the coal mini ng face was pushed forward with 50 m,the main roof above the coal mining face would have a slicing failure in a small scope.The blasting pre-fracturing could make the main roof to be an asymmetry arch structure.The failure of the arch structure would make the horizontal stress reduced within the rock strata of the main roof and the ve rtical stress would be increased.Thus the roof of the coal mining face would be initially pressurized and the roof pressurized step distance would be 88 m.The articulate d structure at the top of the main roof could make the horizontal stress within the rock stratum of the main roof increased and the vertical stress reduced.The breakdow n of the suspended boom structure underneath would cause the secondary roof strata pressurized and the roof pressurized step distance would be 25 m. The articulated structure failure would make the horizontal stress and vertical stress increased within the rock strata of the main roof and would cause the third roof strata pressurized and the roof pressurized step distance would be 20 m.The instability of the arch structure and articulated structure in the main roof would cause the roof strata pressuri zed seriously and the overburden strata breakdown would be expanded to the surface ground.

国家自然科学基金煤炭联合基金资助项目(U1261207)；国家自然科学基金资助项目(51274086)；