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Coal Engineering ›› 2024, Vol. 56 ›› Issue (9): 146-151.doi: 10.11799/ce202409022

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Study on in-situ stress distribution law of shallow coal seam mine in Jixi mining area based on hydraulic fracturing method

  

  • Received:2024-08-01 Revised:2024-09-09 Online:2023-09-20 Published:2025-01-08

Abstract:

Abstract:In order to investigate the distribution law of ground stress in shallow coal seam in Jixi mining area, the hydraulic fracturing method is used to carry out ground stress testing at 30 measuring points in 5 representative mines, and the measured results are analyzed deeply. The results show that the vertical principal stress is smaller than the maximum horizontal principal stress, the horizontal stress occupies the main part of the stress, and the tectonic stress field is prominent. There is no ultra-high stress field, but low, medium and high stress field are distributed, mainly low and medium stress field. The maximum horizontal principal stress direction of six Wells in Lushan Coal Mine and droplet clean coal mining area No. 9 is concentrated in NE; The maximum horizontal principal stress direction of Donghai Coal Mine and Erdaohezi Coal mine is concentrated in NW; The direction of the maximum horizontal principal stress at 3 measuring points is concentrated in NE, and the direction of the maximum horizontal principal stress at 6 measuring points is concentrated in NW. The horizontal principal stress is positively correlated with the buried depth in general, and the correlation between the minimum horizontal principal stress and the buried depth is worse than that of the maximum horizontal principal stress. The side pressure ratio was in the range of 1.16-5.28 and all exceeded 1. With the increase of buried depth, the side pressure ratio gradually decreased, but the dispersion was strengthened. With the increase of buried depth, the relative difference of maximum and minimum principal stress tends to increase, and the horizontal principal stress difference ratio gradually approaches 0.5. The horizontal principal stress difference of different mining levels is larger. The research results have important guiding significance for mining engineering design and surrounding rock control of shallow coal seam in Jixi mining area.

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