摘要
为研究近距离煤层开采期间上煤层遗留煤柱影响段沿空巷道围岩破坏特征及针对性补强支护措施,以神华宁煤集团灵新煤矿051606工作面工程地质条件为背景,通过现场调研、理论分析、工业性试验和矿压观测等手段,对051606回风平巷沿空掘巷期间受上煤层遗留煤柱影响进行研究。结果表明:当051606回风平巷掘进至上煤层遗留煤柱边界下方时,主要受剪切应力影响,而当继续掘进至遗留煤柱中轴线位置下方时,主要受垂直应力影响;051606回风平巷围岩主应力差呈非对称分布,煤柱侧内主应力差值整体要高于实体煤侧。提出以高强预应力锚杆和单体锚索为基础,辅以钢筋梯子梁、钢筋网和架棚支护的强护顶护帮围岩强化控制技术,现场应用结果表明,巷道顶底板和两帮移近量均约为300 mm,取得了较好的围岩控制效果。
In order to study the failure characteristics and targeted reinforcement support measures of surrounding rock in gob-side entry driving affected by residual coal pillar of upper coal seam during the mining of contiguous seams,taking the engineering geological conditions in 051606 working face of Lingxin Coal Mine of Shenhua Ning Coal Group as background,by means of field investigation,theoretical analysis,industrial test and rock pressure observation,this paper studied the influence of residual coal pillar of upper coal seam on 051606 return airway during gob-side entry driving.The results show that when 051606 return airway is driven to the bottom of the boundary of the residual coal pillar of the upper coal seam,it is mainly affected by the shear stress,when it continues to drive to the bottom of the central axis of the residual coal pillar,it is mainly affected by the vertical stress;the main stress difference of the surrounding rock of 051606 return airway is asymmetrically distributed,and the main stress difference in the side of the coal pillar is higher than that in the solid coal side as a whole.Based on the high-strength prestressed anchor rod and single anchor cable,combined with the reinforcement ladder beam,reinforcement mesh and shed support,the strengthening control technology for the surrounding rock of the strong support roof and side wall is put forward.The field application results show that the roof-to-floor convergence and two sides convergence are both about 300 mm,and better surrounding rock control effect is obtained.
作者
刘霞
翟春佳
李常浩
LIU Xia;ZHAI Chunjia;LI Changhao(Chongqing Vocational Institute of Engineering,Chongqing 402260,China;College of Energy and Mining,China University of Mining&Technology(Beijing),Beijing 100083,China;Yuwu Mining Co.,Ltd.,Lu’an Group,Changzhi 046103,China)
出处
《矿业安全与环保》
北大核心
2021年第1期101-107,共7页
Mining Safety & Environmental Protection
基金
“十三五”国家重点研发计划项目(2016YFC0801404)
国家自然科学基金项目(51874292,51574243)。
关键词
近距离煤层
遗留煤柱
沿空掘巷
MATLAB计算
主应力差
数值模拟
巷道支护
contiguous seams
residual coal pillar
gob-side entry driving
Matlab calculation
main stress difference
numerical simulation
roadway support
