坚硬顶板工作面矿压显现及煤柱应力控制技术

Strata behavior and stress control technology for coal pillar in hard roof working face

通过对8709工作面进行矿压观测,结果表明,工作面基本顶周期来压步距平均为16.8 m,支架最大工作阻力为8 026 k N,动载系数约为1.56,工作面超前支承压力影响范围为40 m。采用深孔卸压爆破技术对区段煤柱进行弱化处理,监测表明,爆破后煤柱下方垂直应力大幅度降低,为爆破前的42%。

Through the ore pressure observation on 8709 working face,the results show that the average periodic weighting distance in the main roof distance of the working face is 16. 8 m,the maximum working resistance of the support is about 8 026 k N,the dynamic load coefficient is about 1. 56,and the influence range of the front support pressure on the working face is 40 m. The deep-hole pressure-relief blasting technology is used to weaken the section coal pillar. The monitoring shows that the vertical stress below the coal pillar is greatly reduced after blasting,which is 42% before the blasting.