钱家营矿近距离煤层上行开采矿压规律研究

Numerical simulation of ground pressure in short-distance coal seams

为研究开滦集团东欢坨矿2314工作面近距离煤层采动压力规律,采用理论计算、UDEC数值模拟相结合的方法,对东欢坨矿南一采区2314运道、风道围岩矿压活动规律进行研究,结果表明:南一采区8煤底板破区超出8煤与9煤层间距,最大破碎深度6~10 m,峰值应力线距煤壁外错22~33 m;2314运道回采后高于原岩应力,边界煤柱的应力值为26 MPa,2394开采没有诱发下位的2314和2324顶底岩层塑性损伤和结构面破坏;风道模拟表明,2322回采造成2314边界煤柱应力集中,2314回采后损伤破坏区在竖向扩展较少,主要在边界5~15 m扩展,局部岩块内有铰接点高应力核区的存在。

To study the ground pressure rules of short-distance coal seam in No.2314 Face of Donghuantuo Mine Kailuan Group,methods of theoretical calculation and UDEC numerical simulation were used to study the pressure rules of transport roadway and wind roadway in the south mining area of No.2314 Face.The results showed that the floor break area of No.8 Coal exceeded the spacing between No.8 Coal and No.9 Coal.The maximum crushing depth was 6~10 m and the peak stress line was wrong 22~33 m;the ground pressure of transport roadway was higher than the original rock stress after mining,the stress value of the boundary coal column was 26MPa.There were no plastic damage and structural surface damage in No.2314 Face and No.2324 Face after the mining of No.2394 Face.By the numerical simulation of wind roadway,there was stress concentration of the boundary coal column at No.2314 Face after the mining of No.2394.Vertical expansion damage areas extended little after No.2394 Face mining,mainly in the boundary 5~15 m range extension,and there existed high articulated core areas in local blocks.