上保护层不合理布置对被保护层应力叠加影响效应研究

Study on the influence of the unreasonable layout of upper protective layer on stress superposition of the protected layer

为了研究上保护层不合理布置导致被保护层开采过程中巷道围岩严重变形破坏的问题,采用现场调研、理论分析、数值模拟和矿压观测等方法,对中兴矿3203工作面上保护层开采后的影响效应进行了研究,结果表明:当上保护层遗留煤柱宽度为10~70 m时,其对被保护煤层造成叠加应力大小为13.7~18.1 MPa;当上保护层工作面宽度为75~125 m时,其对应理论垂直有效距离为30~52 m;上保护层布置不合理导致被保护层工作面采掘空间围岩受应力叠加影响而稳定性较差,而合理布置上保护层能够有效改善被保护层采掘空间围岩应力环境,确保矿井安全高效生产。

In order to study the problem of serious deformation and failure of roadway surrounding rocks in the mining process caused by the unreasonable layout of the upper protective layer,by means of field investigation,theoretical analysis,numerical simulation and mine pressure observation,the effect of protective layer in 3203 working face of Zhongxing Coal Mine was studied.The results show that when the width of the coal pillar remaining in the upper protection layer is from 10 m to70 m,the superposition stress on the protected coal seam is from 13.7 MPa to 18.1 MPa;when the working face width of the upper protection layer is from 75 m to 125 m,the corresponding theoretical vertical effective distance is from 30 m to 52 m;the unreasonable layout of the upper protection layer leads to the poor stability of the surrounding rock in the excavation space of the working face of the protected layer under the influence of stress superposition,and the rational layout of the upper protection layer can effectively improve the stress environment of surrounding rock in the excavation space of the protected layer and ensure the safe and efficient production of the mine.