摘要
针对工作面末采期回撤通道顶板失稳导致支护体受力过大和围岩破坏问题,建立了基本顶超前断裂关键块力学模型,对比分析了不同来压位置和悬顶结构对回撤通道稳定性的影响。结果表明:降低支架后方悬顶长度和岩块间的挤压力、提高支护强度可缓解失稳顶板岩块对支架的作用力。基本顶断裂位置靠近回撤通道上方时关键块偏转下沉会造成围岩严重破坏。通过水力压裂可以加速顶板岩层破断和下沉,减轻末采期来压强度甚至改变来压规律,使回撤通道围岩免受顶板强来压作用。现场应用表明,水力压裂后支架载荷和围岩变形显著减小,实现了霍洛湾煤矿31108工作面的安全高效回撤。
Pre-driven longwall recovery room suffers excessive mining pressure and is vulnerable to roof instability.In this paper,a mechanical model of the key block of the advance fracture of the main roof was established,and the effects of different weighting positions and hanging roof structures on the stability of longwall recovery room were compared and analyzed. The results show that reducing the length of the hanging roof behind the support and the extrusion force between rock blocks and improving supporting intensity can reduce the force of unstable roof rock blocks on the support. The rotation and subsidence of the key block will cause serious damage to the surrounding rock when the fracture position of the main roof is close to the upper part of the recovery room. Hydraulic fracturing can promote the breaking and subsidence of the roof strata,reduce the intensity of weighting at the end of the mining period or even change the law of weighting so that the surrounding rock of the recovery room can be protected from the strong mining pressures. The field application showed that the support resistance and surrounding rock deformation were significantly reduced due to hydraulic fracturing,which realized the safe and efficient removal of the 31108 working face of the Huoluowan colliery.
作者
张永强
王襄禹
李冠军
李军臣
姚志红
杨俊峰
ZHANG Yongqiang;WANG Xiangyu;LI Guanjun;LI Junchen;YAO Zhihong;YANG Junfeng(Huoluowan Colliery,Shendong Tianlong Group,Ordos 017200,China;School of Mines,China University of Mining&Technology,Xuzhou 221116,China)
出处
《采矿与岩层控制工程学报》
北大核心
2022年第6期23-32,共10页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金资助项目(52174132)。
关键词
回撤通道
水力压裂
顶板结构
周期来压
支架阻力
longwall recovery room
hydraulic fracturing
roof structure
periodic weighting
support resistance
作者简介
张永强(1990-),男,内蒙古鄂尔多斯人,硕士研究生,主要从事岩层控制和水力压裂等方面的研究工作。758734137@qq.com;通信作者:李冠军(1992-),男,山西河津人,博士研究生,主要从事巷道支护和水力压裂等方面的研究工作。1191052827@qq.com。
