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Author: Admin | 2025-04-28
The 21309 working face: (a) 1 July 2021 to 15 July 2021, (b) 1 November 2021 to 31 November 2022, and (c) 1 February 2022 to 28 February 2022. Figure 12. Energy accumulation during and after the mining of the 21309 working face: (a) 1 July 2021 to 15 July 2021, (b) 1 November 2021 to 31 November 2022, and (c) 1 February 2022 to 28 February 2022. Figure 13. Seismic velocity tomography of stress field around the main roadways: (a) 16 May 2021, (b) 1 September 2021, and (c) 8 June 2022. Figure 13. Seismic velocity tomography of stress field around the main roadways: (a) 16 May 2021, (b) 1 September 2021, and (c) 8 June 2022. Figure 14. Top and sectional view of main roadways in the Cuimu coal mine: (a) Top view main roadways in the Cuimu coal mine, (b) Sectional view of main roadways. Figure 14. Top and sectional view of main roadways in the Cuimu coal mine: (a) Top view main roadways in the Cuimu coal mine, (b) Sectional view of main roadways. Figure 15. Geological map of the main roadways. Figure 15. Geological map of the main roadways. Figure 16. Deep-hole blasting of roof strata at the 22306 working face: (a) the top view of the 22306 working face; (b) the top view of the deep-hole blasting measure; (c) the sectional view of the deep-hole blasting measure. Figure 16. Deep-hole blasting of roof strata at the 22306 working face: (a) the top view of the 22306 working face; (b) the top view of the deep-hole blasting measure; (c) the sectional view of the deep-hole blasting measure. Figure 17. Diagram of deep-hole blasting measures of roof strata near the main roadways: (a) top view of deep-hole blasting; (b) sectional view of deep-hole blasting. Figure 17. Diagram of deep-hole blasting measures of roof strata near the main roadways: (a) top view of deep-hole blasting; (b) sectional view of deep-hole blasting. Figure 18. The floor stress relief measures implemented in key areas of the main roadways: (a) stress cloud map of the main roadways generated by seismic
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