Shanxi Linxian Huarun Liansheng Huangjiagou Coal Industry Co. , Ltd.
School of Mines, China University of Mining and Technology
State Key Laboratory of Digital and Intelligent Technology for Unmanned Coal Mining, Anhui University of Science and Technology

针对遗留煤柱扰动与薄间距岩层条件下动压巷道高应力承载引发的大变形难题,以黄家沟煤矿10102运输平巷为工程背景,建立了遗留煤柱-多状态薄层间岩层作用下的底板应力传递模型,阐述了目标巷道内不同压裂角下应力转移与煤体滑移特征,确定了基于应力源头和传递路径控制的压裂参数,并在现场进行压裂切顶卸压。研究表明:遗留煤柱对底板影响以垂直应力为主,其增压在采空区裂隙岩体劣化承载与碎胀岩体阻隔传载效应下形成了8+9煤底板施载区,并对10煤回采巷道产生附加应力,确定了应力集中边界线敏感角。层间岩层压裂弱化改善了切顶线下方应力环境,降低了遗留煤柱承载与采动应力向10煤煤柱传递程度,确定了等效压裂弱化宽度7.5m。切顶角45°压裂对应层间岩层水平压裂距离12.5m,目标巷道围岩的垂直应力、变形量及煤柱滑移程度达到最小。在现场以45°压裂角实施压裂后,压裂缝网贯通发育,有效实现了预裂切顶。顶底板与两帮变形量较常规条件分别下降了60.1%和65.5%,提高了围岩稳定性,保障了工作面高产高效。

In response to the problem of large deformation caused by high stress bearing capacity of dynamic pressure roadways under the conditions of the residual coal pillars disturbance and thin spacing rock, taking transportation roadway of Huangjiagou Coal Mine as the engineering background, a stress transferring model of the floor under the action of residual coal pillars and multi - state thin interlayer rock layers was established. The stress transfer and coal sliding characteristics under different fracturing angles in the target roadways were elaborated, and fracturing parameters based on stress source and transmission path control were determined. The pressure relief of fracturing roof was carried out on site. The results showed that, the influence of residual coal pillars on the floor is mainly vertical stress, and the pressurization forms the +9 coal seam floor loading area under the action of degradation bearing capacity of fractured rock mass and the blocking transmission effect of broken expanding rock mass in goaf. It also generates additional stress on the surrounding rock of coal seam mining roadway, determining the sensitivity angle of the stress concentration boundary line. The fracturing weakening of interlayer rock improves the stress environment of the coal pillar below the roof cutting line and reduces the load-bearing of the residual coal pillar and the transmission degree of mining - induced stress to coal pillar, obtaining the equivalent fracturing weakening width with 7. 5 m. The fracturing with 45° cutting angle corresponds to a horizontal fracturing distance of 12. 5 m in the interlayer rock, and the vertical stress, deformation, and coal pillar sliding degree of the target roadway surrounding rock reach the minimum. After fracturing with 45° on site, the fracture network was developed and penetrated, achieving pre-splitting and roof cutting. The roof, floor and two roadsides deformation decreased by 60. 1% and 65. 5%, respectively, compared to conventional conditions, improving the the surrounding rock stability and ensuring high production and efficiency of the working face.

国家自然科学基金项目(52104113)

陈学亚,张宁波,刘立明,等.遗留煤柱扰动下薄间距动压巷道压裂卸压护巷技术研究[J].煤炭工程,2025,57(1):42-51.