Mine crustal stress distribution law of shallow coal seams in Jixi mining area
To investigate the distribution law of ground stress in shallow coal seams in Jixi mining area,the hydraulic fracturing method is used to carry out ground stress testing at 23 measuring points in 4 representative mines for the analysis of mining area ground stress field distribution law on account of lithology.The results show that the vertical principal stress is smaller than the maximum horizontal principal stress,the horizontal stress is the main part of stress,and the tectonic stress field is prominent.There is no ultra-high stress field,but low,medium,high stress field are distributed,mainly low and medium stress fields.The horizontal main stress and depth are generally in positive correlation.The minimum horizontal main stress has less correlation with depth compared with the main stress.The side pressure ratios range from 1.16～5.28.With the increase of buried depth,the side pressure ratios gradually decrease,but the dispersion is strengthened.The relative difference of maximum and minimum principal stresses tends to increase,and the horizontal principal stress difference ratio gradually approaches 0.5.The horizontal principal stress differences at different mining levels are large.The research results have an important guidance for mining engineering design and surrounding rock control in shallow coal seams in Jixi mining area.
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