深部煤巷两帮造穴卸压围岩主应力差演化规律及应用
Evolution law and engineering application on main stress difference for a novel stress relief technology in two ribs on deep coal roadway
陈冬冬 1蒋再胜 1马翔 1谢生荣 2王恩 1李辉1
作者信息
- 1. School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China
- 2. School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources(China University of Mining and Technology-Beijing),Beijing 100083,China
- 折叠
摘要
常规钻孔卸压、松动爆破卸压技术对煤巷浅部锚固围岩带来一定程度的损伤,不能解决卸压与锚固之间的冲突.本文采用强锚和卸压协同控制技术来平衡上述冲突.采用数值模拟方法研究不同卸压参量对煤巷围岩主应力差的响应演化规律,确定合理的卸压关键参数并讨论各参量影响程度.研究结果表明:1)当造穴深度较小时,主应力差峰值带不能有效转移至深部围岩;当造穴深度较大时,巷帮主应力差峰值带呈双高峰分布,造成无效卸压;当造穴深度为10 m时,巷帮新主应力差峰值带向深部围岩转移7.5 m且并未损害巷帮浅部锚固区域功能.2)增加造穴长度不会导致造穴孔洞起端至巷道壁之间主应力差形状及量值改变,仅能造成第二主应力差峰值位置及量值改变,且第二主应力差峰值位置的迁移程度远大于其量值的增长幅度.3)当造穴排距大于5 m时,相邻造穴孔洞间将出现主应力差高峰区域,导致相邻孔洞间卸压不充分;当造穴排距小于5 m时,各造穴孔洞产生的主应力差低值区域将互相连通,在巷帮深部形成一条连贯的主应力差卸压带.基于上述煤巷两帮造穴卸压围岩主应力差演化的规律获得了造穴最佳参数并将其应用于工程实践,现场应用结果表明强锚和卸压协同控制技术可有效解决深部煤巷围岩持续大变形控制的难题.
Abstract
Routine serried drilling(slotting)technology ruins the coal mass and support architecture of the anchorage ring during stress relief,and cannot resolve the conflict between stress relief and anchorage.Therefore,a novel powerful anchorage and stress relief technology was proposed in this study to balance the conflict.The numerical simulation analysis was conducted on the main stress difference(MSD)of stress relief in large-hole fabrication to acquire the first-best stress relief parameters.1)When the distance between the starting site of the large-hole fabrication and the roadway wall(Lh),is small,the stress-crest region near the roadway cannot be effectively shifted far from the roadway.When Lh³12 m,the stress data curve of the roadway rib exhibits a double high crest distribution.When Lh is 10 m,the new crest site of MSD of the roadway rib shifted far from the roadway is 7.5 m without ruining the anchorage function of the superficial part of the anchor cable.2)The increase in the large-hole fabrication length does not lead to a change in the shape and size of the MSD between the starting site of the large-hole fabrication and the roadway wall.With the increase in the large-hole fabrication length,the migration degree of the crest site of the second MSD is larger than the degree of the crest size of the second MSD.3)When the large-hole fabrication spacing is>5 m,the high MSD between neighboring large holes appears,resulting in invalid stress relief between neighboring large holes.When the large-hole fabrication spacing is £4 m,the small regions of the MSD produced by each large hole are connected,forming a continuous stress relief region in the deep part of the roadway rib.The engineering application results reveal that this powerful anchorage and stress relief technology can effectively control the deformation of the surrounding rock in a deep roadway.
关键词
深部矿井/软碎煤巷/大孔造穴/主应力差/卸压技术Key words
deep coal mine/soft coal roadway/large-hole fabrication/main stress difference/novel stress relief technology引用本文复制引用
基金项目
National Natural Science Foundation of China(52004286)
National Natural Science Foundation of China(52074296)
Fundamental Research Funds for the China University of Mining and Technology-Beijing Top Innovative Talents Cultivation Fund(BBJ2023003)
Fundamental Research Funds for the Central Universities,China(2022XJNY02)
Fundamental Research Funds for the Central Universities,China(2022YJSNY18)
出版年
2023
NETL
NSTL
维普
万方数据