摘要
针对神广煤矿5^(-2)煤房式开采后4^(-2上)、4^(-3)煤上行开采安全生产问题,首先通过理论分析对4^(-2上)、4^(-3)煤上行开采可行性进行了初步论证;然后采用3DEC离散元软件建立了三维数值模型,分析了5^(-2)煤房式开采对上部4^(-2上)、4^(-3)煤整体性和连续性的影响;研究了4^(-2上)、4^(-3)煤开采对层间岩层及5^(-2)煤采空区留设煤柱稳定性的影响规律.结果表明:4^(-2上)、4^(-3)煤的比值K分别为33.07、23.46,均大于临界值7.5,5^(-2)煤采空区煤柱的极限承载强度为7.84MPa;5^(-2)煤开采后,4^(-2上)和4^(-3)煤整体性和连续性保持完好;4^(-2上)、4^(-3)煤层上行开采使得层间岩层应力降低,位移减小,且未对层间岩层及5^(-2)煤采空区留设煤柱造成破坏性影响,层间岩层矿压显现不明显.理论分析与数值模拟结果表明神广煤矿4^(-2上)、4^(-3)煤满足上行开采条件.
Aiming at the problems of safe upward mining after the 5^(-2) coal room mining in Shenguang Coal Mine,the feasibility of upward mining of 4^(-2)up and 4^(-3) coal seam and the stability of coal pillars are demonstrated by theoretical analysis.A three-dimensional numerical model was established using 3 DEC.The influence of room mining of 5^(-2) coal seams on the integrity and continuity of 4^(-2up) and 4^(-3) coal seams are studied.The influence of upward mining of 4^(-2up) and 4^(-3) coal seam on the stability of interlayer strata and coal pillar is analyzed.The results show that the ratio K of 4^(-2up) and 4^(-3) coal seam is 33.07 and 23.46,respectively,both of which are beyond the critical value(7.5),and the ultimate bearing strength of coal pillars in the goaf of 5^(-2) coal seam is 7.84 MPa.4^(-2up) and 4^(-3) coal seams are still integrated and consecutive after 5^(-2) coal seam mining.The upward mining of 4^(-2up) and 4^(-3) coal seam leads to reduction of the stress and displacement of interlayer rock,and does not have a destructive impact on the interlayer strata and the coal pillar left in the goaf of 5^(-2) coal seam.The mine pressure behavior of interlayer strata is not obvious.Theoretical analysis and numerical simulation results show that the 4^(-2up) and 4^(-3) coal seam in Shenguang Coal Mine meet the conditions for upward mining.
作者
张小军
覃祥瑞
陈勋勋
张嘉凡
ZHANG Xiao-jun;QIN Xiang-rui;CHEN Xun-xun;ZHANG Jia-fan(Shaanxi Coal Science Research Institute,Xi'an 710001,China;Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2022年第3期6-11,共6页
Coal Engineering
基金
国家科技部科研院所技术开发研究专项资金项目(2011EG122206)
陕西省自然科学基础研究计划项目(2020JZ-53)。
关键词
房式开采
上行开采
比值判定法
层间岩层稳定性
煤柱稳定性
room mining
upward mining
ratio method
stability of interlayer rock strata
coal pillar stability
