坚硬顶板工作面矿压显现及煤柱应力控制技术
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摘要
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.
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.
引文
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[2]李洪武.综放开采区段煤柱应力分布及其尺寸优化[J].煤炭科学技术,2016,35(8):39-42.
[3]张强,黄艳利,周楠,等.合理窄煤柱护巷采动侧向应力分布规律[J].煤矿安全,2011,42(8):175-178.
[4]李小军,李怀珍,袁瑞甫.倾角变化对回采工作面区段煤柱应力分布的影响[J].煤炭学报,2012,37(8):1270-1274.
[5]张少杰,王金安,魏现昊.煤柱过渡区的应力迁移与冲击矿压显现特征[J].中国矿业,2013,22(5):73-78.