Rock control mechanism of gangue grouting and interval backfilling in post-mining space under aquifer in China?s western mining area
ZHOU Nan 1, 2, ZHANG Jixiong1, 3, XU Jianfei1, 2, ZHANG Yuzhe1, 2, LI Zejun1, 2
(1. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 2. Jiangsu Key Laboratory for Clean Utilization of Carbon Resources, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;
3. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground
Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China)
Abstract：Existing backfill technologies prove insufficient to ensure coordinated water conservation and overburden control requirements for high-productivity longwall mining beneath aquifers in western Chinese coal fields, primarily attributed to compromised extraction efficiency and scarcity of conventional backfill materials. This necessitates innovative advances in backfill theory and technology to achieve non-interference between mining and backfilling, as well as secure mining operations under aquifers in one unified process. This research proposes a method of gangue grouting and interval backfilling in post-mining space. A gangue fluidised grouting diffusion simulation system is developed, and the diffusion characteristics and laws of gangue slurry in the mining space are tested. A numerical model of gangue grouting and interval backfilling in post-mining space is established, and the deformation and stress evolution laws of key aquiclude strata at different equivalent backfilling rates are studied, revealing the control mechanism of gangue grouting interval backfilling for rock layers under aquifers in mining space. The research results demonstrate that the method of gangue grouting and interval backfilling in post-mining space and its key parameters are proposed, with the equivalent backfilling rate defined to characterise the volume of grouted filling. The gangue slurry exhibits significant lateral and longitudinal extension during its spread in the mining space. The lateral spreading range of the slurry shows an approximately linear growth trend from top to bottom, with a final distribution shape resembling a circular table. As grouting pressure increases, both the lateral and longitudinal extension of the gangue slurry are gradually enhanced. The lateral diffusion diameter decreases with increasing slurry concentration. The subsidence reduction rate of key aquiclude strata increases exponentially as the equivalent backfilling rate rises. An equivalent backfilling ratio of at least 70% is required to achieve effective control of the watertight critical layer. The gangue slurry and broken rock body together form a load-bearing assembly with significantly enhanced mechanical properties. This load-bearing combination achieves control of the rock layer in the mining space under the aquifer by limiting the deformation of the waterproofing key layer, reducing stress concentration in the waterproofing key layer, and decreasing the continuity in the separation area. This investigation establishes theoretical foundations for both ecologically sustainable disposal of coal-based solids and reliable water-preserved mining in arid western regions.
周 楠1，2，张吉雄1，3，许健飞1，2，张羽者1，2，李泽君1，2. 西部矿区含水层下采动空间矸石注浆间隔充填岩层控制机制研究[J]. 岩石力学与工程学报, 2025, 44(7): 1736-1751.
ZHOU Nan 1, 2, ZHANG Jixiong1, 3, XU Jianfei1, 2, ZHANG Yuzhe1, 2, LI Zejun1, 2. Rock control mechanism of gangue grouting and interval backfilling in post-mining space under aquifer in China?s western mining area. , 2025, 44(7): 1736-1751.
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2025, Vol. 44 
