摘要
钱家营矿主采煤层以典型的近距离煤层群形式赋存,为解决钱家营矿近距离煤层群开采中由于村庄压煤而面临的采掘衔接困难问题,对下部12-1煤层开采的保护范围进行计算,并通过理论分析、数值计算、相似材料模拟试验等方法,分析了12-1煤层开采后对9煤层的影响和破坏程度,研究了12-1煤层回采后上覆岩层变形和应力变化以及煤柱区域垂直应力变化特征。结果表明:下部12-1煤层开采后,对9煤层具有保护效果,采动影响系数K值为10.8～13.0,煤层破坏程度在30以内,9煤层总体形态较好,处于12-1煤层的裂隙带中,应力降低明显,卸压效果显著。提出跨煤柱巷道布置方案,进一步减弱了采动影响。现场监测表明运用上行开采跨煤柱巷道布置方式对解决钱家营矿近距离煤层群的开采问题效果良好。
The main mineable coal seams of Qianjiaying coal mine are typically closed distance seams.In order to solve the problem of mining connection for Qianjiaying coal mine,the protection range of the lower 12-1 coal seam was calculated.And using theoretical analysis,numerical simulation,similar material simulation experiment and other methods analyzed the influence and damage degree of 9 coal seam after mining the 12-1 coal seam.It also studied the deformation and stress variation characteristics of overlying strata and variation characteristics of vertical stress in coal pillar after 12-1 coal seam mined.The results show that the mining influence coefficient value for 9 coal seam is 10.8~13.0,and the coal seam damage degree is less than 30.The overall shape of 9 coal seam is generally complete,and the stress decreases significantly and the pressure relief effect is remarkable for 9 coal seam.It proposes the roadway layout of straddled coal pillars,which further weakens the influence of mining for 9 coal seam.According to field observation,the roadway layout of straddled coal pillars with ascending mining can effectively solve the problem of mining closed distance coal seams in Qianjiaying coal mine.
作者
赵象卓
高照宇
吴涛
张璐宇
韩军
Zhao Xiangzhuo;Gao Zhaoyu;Wu Tao;Zhang Luyu;Han Jun(College of Mining Engineering,Liaoning Technical University,Fuxin,Liaoning123000,P.R.China;Safety Production Supervision and Administration Bureau of Linxi County,Chifeng,Inner Mongolia025250,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2019年第1期194-201,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51674135)
关键词
近距离煤层
上行开采
煤层卸压
巷道布置
closed distance seam group
ascending coordination mining
seam pressure released
layout roadway
