近水平层滑构造高侧压系数对防突卸压角的影响研究

Study on the Influence of High Lateral Pressure Coefficient near Horizontal Bedding Slip Structure on Outburst Prevention and Pressure Relief Angle

为确定近水平层滑构造高侧压系数对上保护层开采保护范围的影响,以韩城矿区下峪口煤矿为工程背景,分析了不同侧压系数对被保护层垂直应力演化、弹性能分布的影响,理论分析得出保护层开采后在煤层走向上产生高地应力梯度,进而减小防突卸压保护角;采用数值模拟方法得出保护层开采条件下煤层走向防突卸压角随侧压系数增大而减小,工作面倾斜上、下方的防突卸压角基本不受侧压系数影响的规律。该研究可为矿井被保护层工作面布置及瓦斯治理提供符合矿井实际的科学依据,并对相似矿井保护层开采范围的确定具有借鉴意义。

In order to determine the influence of high lateral pressure coefficient near horizontal bedding slip structure on the protection zone of the upper protective layer,taking Xiayukou Coal Mine in Hancheng mining area as engineering background,the influence of different lateral pressure coefficients on vertical stress evolution and elastic energy distribution of protected layer was studied.The theoretical analysis shows that high stress gradient is generated on the coal seam direction after the protective layer is mined,and then the protective angle of outburst prevention and pressure relief is reduced;the numerical simulation method is used to obtain that outburst prevention and pressure relief angle of coal seam strike decrease with the increase of lateral pressure coefficient,outburst prevention and pressure relief angle at the top and bottom of the inclined working face are not affected by the lateral pressure coefficient.The research provides the scientific basis for the arrangement of coal mine protected layer and gas control,and it can be used for reference to the determination of protective layer mining range of similar coal mine.