浅埋深大采高工作面矿压显现及支架适应性研究

摘要

In order to study the mine strata behavior law,the rational working resistance of the hydraulic powered support and other suitability of the fully mechanized high cutting coal mining face in a shallow depth seam,a site observation was conducted on the mine strata behavior and the working resistance of the hydraulic powered support in the first coal mining face of the mine-No.10101 high cutting fully mechanized coal mining face of Ciyaogou Mine.A calculation was conducted on the roof movement parameters of the coal mining face,the roof weighting step distance of the coal mining face and the rational working resistances of the powered support.The paper had an analysis on the powered support suitability.The study result showed that the initial roof weighting step distance of the coal mining face was 56.8 m and was fitting with the theoretical calculation results.The periodic roof weighting step distance of the coal mining face would be increased with the pushing forward speed of the coal mining face increased.When the pushing forward speed of the coal mining face was 4 m/d and 8 m/d,the periodic roof weighting step distance was 11.1 m and 22.7 m individually.The working resistance of the powered support in the coal miming face would be large in the middle and small in the two ends.The max working resistance of the powered support was 7 665 kN.The hydraulic powered with the selected max working resistance of 8 000 kN could reach the expected support effect.But the measured initial support force of the powered support was too low and the operation technique of the powered support should be optimized further.The study results could provide the reference basis to the mine strata pressure control and the equipment selection of the late coal mining face in Ciyaogou Mine and the similar mine with the other geological condition.%为研究浅埋深大采高工作面矿压显现规律、液压支架合理工作阻力及其适应性,对磁窑沟煤矿首采10101大采高综采工作面的矿压显现及液压支架工作阻力进行现场观测,并对工作面顶板运动参数、工作面来压步距和合理支架工作阻力进行计算,分析了支架适应性.研究结果表明:工作面初次来压步距为56.8 m,与理论计算结果吻合;工作面周期来压步距随工作面推进速度增大而增大,工作面推进速度为4 m/d和8 m/d时,周期来压步距分别为11.1m和22.7 m;工作面支架工作阻力呈中间大两端小,支架实测最大工作阻力7 665 kN,理论计算支架合理工作阻力为7 676.4 kN,所选用最大工作阻力为8 000 kN的液压支架能达到了预期支护效果,但支架实测初撑力偏低,液压支架操作工艺需进一步优化.研究结果为磁窑沟矿后续工作面及其他地质条件类似矿井矿压控制和设备选型及优化提供参考依据.