Shaanxi Huangling No. 2 Coal Mine Co., Ltd.

厚煤层煤柱留设宽度对煤炭资源回收率与围岩稳定性具有重要影响。为黄陵二号煤矿煤柱留设合理宽度,运用数值模拟方法与现场实测技术,对不同煤柱留设宽度的围岩应力进行分析,并对锚索应力、顶板离层量的演化趋势进行监测。结果表明,煤柱尺寸在12~18m时应力峰值与位移峰值变化范围最小,最终确定煤柱尺寸为15m。工程监测表明,回采动压超前影响范围为220m,工作面距离四联巷的-50m到75m范围为矿压快速显现阶段。工作面回采过后50m,锚索应力与顶板离层量趋于稳定状态,验证了黄陵二号煤矿303工作面的煤柱留巷稳定性满足围岩的支护控制需求。

ity of surrounding rock. For the reasonable width of coal pillar in Huangling No. 2 Coal Mine, the stress of surrounding rockwith different width of coal pillar is analyzed by numerical simulation method and field measurement technology, and the e-volution trend of anchor cable stress and roof separation is monitored. The results show that varies in the scale of stress peakand displacement peak are least when the coal pillar size is from 12 m to 18 m, and finally the coal pillar size is determinedto be 15 m. Engineering monitoring shows that the advance influential range of mining dynamic pressure is 220 m, and therapid development stage of mine pressure is from - 50 m to 75 m from the working face to Silian roadway. After 50 m ofmining, the anchor cable stress and roof separation tend to be stable, which verifies that the stability of coal pillar retentionroadway on the 303 working face of Huangling No. 2 Coal Mine meets the support control requirement of surrounding rock.