Mining-induced stress evolution under the simulated looped mining mode of fluidized mining
LI Danli1, LIU Jianfeng1*, WEI Jinbing1, TANG Yifang1, YUAN Honghao1, PENG Ruidong2
(1. College of Water Resources and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China)
Abstract：Fluidized mining of deep solid resources represents an innovative approach to mining; however, the evolution of mining-induced stress under this method remains inadequately understood. To elucidate the mechanism of stress evolution and establish its relationship with laboratory testing conditions, this study employs FLAC3D numerical simulations to investigate the characteristics of the mining-induced stress field, the variations in the stress concentration coefficient, and the stress disturbance path under the looped mining layout of fluidized mining. The findings reveal that the evolution of mining-induced stress in looped mining exhibits stage-dependent behavior, leading to the development of a spatially non-uniform stress field ahead of the excavation face, which may result in long-term eccentric loading of mining equipment. The evolution trend of the stress concentration coefficient aligns with that observed in longwall mining. However, under the filling conditions considered in this study, the asymptotic value (2.0–2.4) is approximately 20% lower than that observed in longwall mining, indicating that filling can effectively mitigate peak stress and enhance mining safety. Based on these numerical results, a mapping scheme for the stress disturbance path for laboratory testing has been established, providing a preliminary foundation for the experimental investigation of the mechanical response of coal-rock under looped fluidized mining conditions.
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2026, Vol. 45 
