回采巷道爆破切顶钻孔角度对侧向支承压力分布影响浅析

Angle on lateral abutment pressure distribution in mining roadway

良好的围岩应力环境有利于工作面采动影响下相邻回采工作面回采巷道的安全掘进与维护。通过理论分析与数值模拟方法分析不同切顶高度条件下,切顶钻孔向煤柱侧倾斜15°和向工作面后方倾斜15°对工作面侧向支承压力分布规律的影响。结果表明:距工作面煤壁不同距离处的侧向支承压力峰值随着切顶高度的增加而减小,切顶钻孔角度对侧向支承压力峰值的大小影响较小。切顶钻孔角度对侧向支承压力峰值位置影响显著,切顶钻孔向工作面后方倾斜15°可以消除切顶钻孔向煤柱内倾斜15°时对侧向支承压力峰值位置的影响,有利于相邻回采巷道的围岩控制。

The good surrounding rock stress environment is conducive to the safe excavation and maintenance of the adjacent mining roadway under the influence of mining movement.Through theoretical analysis and numerical simulation,the influence of 15°tilt to the coal pillar side and 15°tilt to the back of the working face on the lateral abutment pressure distribution of the working face under different cutting height is analyzed.The results show that the peak value of lateral abutment pressure at different distances from coal wall decreases with the increase of cutting height,and the Angle of cutting hole has little effect on the peak value of lateral abutment pressure.The Angle of cutting the top borehole has a significant influence on the peak position of lateral abutment pressure.The tilt of cutting the top borehole to the rear of the working face by 15°can eliminate the influence on the peak position of lateral abutment pressure when the cutting borehole is tilted to the coal pillar by 15°,which is conducive to the surrounding rock control of the adjacent mining roadway.