摘要
为了研究多煤层重复采动下覆岩破坏高度的发育规律,以公乌素煤矿三煤层开采为工程背景,通过现场实测、数值模拟研究方法,得到了单层开采和三层重复开采时16煤1604工作面覆岩导水裂缝带高度,采用3DEC数值模拟研究了单煤层开采及重复采动覆岩的破坏特征,理论分析了重复采动覆岩裂隙发育机理及裂缝带高度的计算方法。结果表明:钻孔冲洗液观测与钻孔窥视结合实测法更准确,公乌素16煤重复采动条件下,裂采比15.14,垮采比3.15;模拟显示采空区两侧裂隙发育明显且为离散裂隙,中部裂隙闭合,裂隙高度与实测较为接近;提出了3种不同程度的重复采动裂缝带发育高度的计算方法,为确定重复采动条件下覆岩裂隙发育高度提供理论依据。
In order to study the development law of overburden failure height under repeated mining in multiple coal seams,taking the mining of No.16 coal seam 1604 working face in Gongwusu Coal Mine as the engineering background,the height of overburden water conducting fracture zone during single-seam mining and three-seam repeated mining is obtained through field measurement and numerical simulation.The failure characteristics of overburden under single coal seam mining and repeated mining is studied with 3DEC numerical simulation,,and the fracture development mechanism of overlying rock under repeated mining and the calculation method of fracture zone height are analyzed theoretically.The results show that the combination of borehole flushing fluid observation and borehole peeping is more accurate.Under repeated mining of the No.16 coal seam,the split-mining ratio is 15.14 and the collapse-mining ratio is 3.15;the simulation shows that the fractures on both sides of the goaf are obviously developed and discrete,the middle fracture is closed,and the fracture height is close to the measured value;three kinds of calculation methods for the development height of repeated mining fracture zone are put forward,which provides a theoretical basis for determining the development height of overburden fracture under repeated mining.
作者
李友伟
张玉军
肖杰
LI You-wei;ZHANG Yu-jun;XIAO Jie(Coal Mining Branch,China Coal Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;CCTEG Coal Mining Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China)
出处
《煤炭工程》
北大核心
2022年第7期97-103,共7页
Coal Engineering
基金
国家自然科学基金资助项目(52174079,51874177)
天地科技创新基金(KJ-2021-KCM-03)。
关键词
导水裂缝带
重复采动
钻孔窥视
数值模拟
water conducting fracture zone
repeated mining
borehole peeping
numerical simulation
