Abstract
Solid waste backfill mining can effectively deal with gangue and other mining wastes, as well as control the movement and damage of rock strata. In this paper, the RFPA2D rock failure process analysis software is used to study the fracture evolution and seepage response mechanism of the key aquiclude strata (KAS) under the conditions of different structural characteristics, interlayer rock thickness, and backfilling ratios in backfill mining. The simulation results show that, in backfill mining, soft rock plays a crucial role in the fracture repair of KAS with different structural characteristics. An increase in the KAS thickness from 15 to 35 m is shown to results in a continuously improved repair of KAS fractures. At the advancing distance of the working face of 50~100 m and the KAS thickness of 35 m, the minimum vertical seepage velocity of 0.06 ‐ 0.78 × 10 − 2 m / s is reached. An increase in the backfilling ratio from 45 to 80% improves the control effect on the overlying strata. A case study of backfill mining in the Wugou Coal Mine located in the Anhui Province of China was conducted. At the goaf backfilling ratio of 80%, the composite KAS’s good control effect was achieved, which minimized seepage and avoided the water in rush phenomena. The above engineering application ensured the safe backfill mining of coal resources.
Highlights
The global demand for green energy is related to the inevitable exhaustion of fossil fuels and increasing concern about the environment and air quality
Most mining areas adopted waterproof coal pillar reservation methods, strip mining, thickness limiting mining, and drainage pressure reduction for coal mining under water bodies, which resulted in a large-scale waste of coal and water resources [4–6]
This paper investigates the effect of different geological structural parameters and multilayer characteristics of key aquiclude strata (KAS) on repairing damage caused by mining to overlying strata and the related vertical seepage velocity
Summary
The global demand for green energy is related to the inevitable exhaustion of fossil fuels and increasing concern about the environment and air quality. The theoretical research and field measurement results related to this technology show that under the coupling effect of the backfill body and surrounding rock, the development height of the water-conducting fractured zone (HWFZ) in the overlying strata can be limited, and the surrounding rock fractures readily compacted and closed. This greatly reduces the water inrush risk, improves the coal recovery rate, and protects water resources. The adopted method ensured safety for the SBM method and provided a reference for engineering applications under similar conditions
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