开采解放层后支承压力分布规律的数值分析

NUMERICAL ANALYSIS ON DISTRIBUTION RULE OF SUPPORTING PRESSURE AFTER EXPLOITING LIBERATED SEAM

为得出煤层开采解放层的卸压效果及开采过程中采场支承压力的变化特征,采用有限差分法分析软件FLAC3D进行模拟分析,得出开采解放层是煤层卸压的有效措施;支承压力集中系数与工作面推进距离有关,工作面初次来压完成后,随工作面向前推进,支承压力峰值逐渐增大,推进到一定距离后支承压力峰值趋于稳定;采空区支承压力分为卸压带、高支承压力带和原岩应力带。该研究为工作面开采设计提供理论指导,对防治冲击地压具有一定的现实意义。

To obtain the pressure relief effect of the exploitation of liberated seam in coal bed and the variation feature of supporting pressure in stope during the exploitation process,FLAC3D,which is a finite difference method analysis software,is used to simulate and analyse them,and draw the conclusion that to exploit liberated seam is the effective measure for seam pressure relief;the supporting pressure concentration coefficient is related to the impelling distance of mining face,after the completion of the first weighting of the mining face,the peak value of supporting pressure gradually increases along with the mining face impelling forward,and it tends to be stable when a certain distance has been impelled to;the supporting pressure in mined-out region can be split into stress-relaxed zone,rock stress zone and stress rising zone.This study provides theoretical guidance for the mining design of the workface and has practical significance in prevention of rock burst.