煤层群下位煤层开采速度对矿压显现影响规律

Influence Law of Coal Seam Mining Speed on Pressure Behavior in Lower Coal Seam Group

以凉水井煤矿431301综采面为研究背景,结合数值模拟与理论计算研究近距离煤层群下位煤层推进速度对工作面矿压显现的影响规律。研究结果表明:4^(-3)煤推进速度增加后改变了工作面顶板岩层运移特征,增加了工作面来压动载系数,但上下关键层仍能保持稳定的双砌体梁结构,使推进速度对工作面来压强度影响较小。

Taking the 431301 fully mechanized mining face of Liangshuijing Coal Mine as the research background,combined with numerical simulation and theoretical calculation,the influence law of coal seam advancing speed under the short distance coal seam group on the pressure behavior of the working face is studied.The results show that the movement characteristics of the roof strata of the working face are changed with the increase of the advancing speed of 4^(-3) coal,and the dynamic load coefficient of the working face is increased,but the stable double masonry beam structure of the upper and lower key strata can be maintained,so that the advancing speed has little effect on the compressive strength of the working face.