极近距煤层矿压显现强度的间距影响规律研究

为分析浅埋近距煤层下工作面在通过上层采空区和遗留煤柱时矿压显现机理,合理确定支架支护阻力,对浅埋深、近距条件下煤层开采矿压显现强度变化规律与工作面支架阻力确定问题进行了探讨。结果表明:随着层间距的增大,支架阻力逐渐减小;当层间距小于15 m时,层间距变化对该工作面矿压显现变化影响较大;当层间距大于15 m时,层间距变化对该工作面的矿压显现变化影响较小。在采空区、煤柱与实体煤层下矿压显现呈现不同规律:采空区下来压步距9.8 m,最大工作阻力10 920 k N,动载系数1.3;煤柱下来压步距10.8 m,最大工作阻力11 065 k N,动载系数1.35;实体煤下来压步距12.2 m,最大工作阻力10 742 k N,动载系数1.39。

The impact study on strata behavior laws of different coal seam spacing in ultra closed coal seams

In order to analyze the mining pressure behavior mechanism of lower coal seam working faces in shallow and closed coal seams while mining through upper coal seam goaf and left coal pillars, and determine the support resistance reasonably, the mine pressure change law and the support resistance of the lower coal seam in shallow and closed coal seams have been discussed. Results show that with the increase of coal seam spacing support resistance decreases. The mining pressure behavior will be influenced greatly by coal seam spacing when the coal seam spacing is less than 15 m while the influence will be very limited when the coal seam spacing is more than 15 m. The mining pressure behavior are different under the goaf, the left coal pillars and the coal seam:under the goaf the roof breakage pace is 9.8 m, the maximum operation resistance is 10 920 kN and the dynamic factor is 1.3;under the left coal pillars the roof breakage pace is 10.8 m, the maximum operation resistance is 11 065 kN and the dynamic factor is 1.35;under the coal seam the roof breakage pace is 12.2 m, the maximum operation resistance is 10 742 kN and the dynamic factor is 1.39.