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以神木县某矿黄土充填开采回收房式煤柱为工程背景,通过UDEC数值模拟软件对充填回收房式煤柱过程中工作面前方煤柱应力、工作面后方充填体应力及地表移动下沉进行了模拟研究。结果表明:随着开挖充填作业的进行,工作面前方煤柱支承应力逐渐增大,采场超前影响范围约为3个煤柱;充填体内应力变化呈“初始应力区-应力增大区-应力基本稳定区”规律;采用充填开采回收房式煤柱后地表的最大移动下沉量为338 mm,对地表的控制效果显著。
Based on the engineering background of reclaimed coal pillars collected by loess filling in a mine in Shenmu County, the stress of coal pillar in front of the working face, the stress of backfill in the back face of the working face and the sinking of the earth’s surface were measured by UDEC numerical simulation software Simulation study. The results show that with the progress of excavation and filling work, the supporting stress of coal pillar in front of work face gradually increases, and the influence range of mining field ahead is about 3 coal pillars. The stress change in filling body shows “initial stress zone - stress increasing zone - the basic stability zone of stress ”rule; the maximum displacement of the ground surface after the reclamation of the coal pillar by filling is 338 mm, and the control effect on the ground surface is remarkable.