Abstract
The grand-scale suspended roofs overlying the goaf are commonly developed under thick-hard rock strata (THRS) during the mining process of the deep coal seam. As a result, strong mine seismicities triggered constantly by deep mining have impeded severely the safety and efficient operation of deep mines. The working-face deep-hole blasting technology has been utilized to weaken the roof for releasing the mine pressure, thereby reducing the risk of violent dynamic hazards. In this paper, Dongtan deep coal mine is taken as an example, the radius of rock failure regions induced by blasting is calculated based on the expansion theory of cylindrical charges. LS-DYNA and UDEC7.0 softwares are employed to simulate the rock pre-splitting and overburden migration under the working-face deep-hole blasting, and the roof pre-splitting and pressure relief mechanism of the working-face deep-hole blasting are revealed. According to the micro-seismic, support working resistance and real-time stress monitoring results, the working-face deep-hole blasting technology could actively break the integrity of the roof. Using the blasting, high-energy mining-induced seisms are decreased dramatically or disappeared fully. The advanced abutment pressure of the coal seam decreases with the increase of the working-face deep-hole blasting time, which indirectly indicates that the weakening degree of the thick-hard roof gradually increases under the action of multiple blasting. The working-face deep-hole blasting technology has achieved the desired effect in the pressure relief in hard suspended roofs for preventing and controlling strong mining-induced seismicity.
Highlights
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The distribution of mining-induced seismicities before and after the working-face deep-hole blasting is revealed by the micro-seismic system.
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The rock pre-splitting and overburden migration influenced by the working-face deep-hole blasting are numerically simulated.
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The effectiveness of strong seismicity prevention and control is systematically evaluated by a series of monitoring technology.
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The working-face deep-hole blasting technology could achieve the desired effect in the pressure relief of roofs.
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Data Availability
All data used during this study are available from the corresponding author by request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (no. 4222780052 and 42177152), Key Technologies R&D Program of Shandong Energy Group Co., LTD (no. 9000B2022000219) and Open Fund of State Key Laboratory of Water Resource Protection and Utilization in Coal Mining (no. WPUKFJJ2019-18).
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Wu, K., Zou, J., Jiao, YY. et al. Insight and Effectiveness of Working-Face Deep-Hole Blasting for Prevention of Strong Seismicity Induced by Deep Coal Mining. Rock Mech Rock Eng 56, 8693–8709 (2023). https://doi.org/10.1007/s00603-023-03516-8
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DOI: https://doi.org/10.1007/s00603-023-03516-8