Research on in-situ stress distribution law of coal mines with rock burst hazard in Binchang mining area
To investigate the in-situ stress distribution law of deep coal mines with rock burst hazard in Binchang mining area,in-situ stress tests were conducted at 28 measurement points in 6 typical coal mines using both hydraulic fracturing and stress relief methods,followed by an in-depth analysis of the results.The findings indicated that the vertical principal stress in the study area was generally smaller than the maximum horizontal principal stress,with the horizontal stress constituting the main part of the in-situ stress,and the characteristics of the tectonic stress field were significant;There was no area with low in-situ stress in the strdy area,and areas with medium,high,and ultra-high in-situ stress were all present,with a predominance of high and ultra-high in-situ stress fields.The direction of the maximum horizontal principal stress at the Wenjiapo Coal Mine,Hujiahe Coal Mine and Yadian Coal Mine was concentrated in the northeast,while that at the Dafosi Coal Mine,Mengcun Coal Mine and Xiaozhuang Coal Mine was focused on the northwest.Based on the angle between the direction of the maximum horizontal principal stress and the axial directions of the main driving(preparation)roadway and mining roadway in the Binchang mining area,the impact of in-situ stress on the stability of the roadways was analyzed.The horizontal principal stress was overall positively correlated with depth,with the correlation of the minimum horizontal principal stress with depth being weaker compared to the maximum horizontal principal stress;The lateral pressure ratio ranged from 0.98 to 2.25,mainly concentrated between 1 and 2,with only one measurement point's lateral pressure ratio less than 1,and the lateral pressure ratio gradually increased overall with the increase of depth,but the dispersion intensified;With increasing depth,there was a increasing trend of relative difference between the maximum and minimum principal stresses,with the horizontal principal stress difference ratio fluctuating around 0.5,and significant differences in horizontal principal stresses at different mining levels of the coal mines.
rock bursthydraulic fracturing methodstress relief methodin-situ stressBinchang mining area
万方数据
维普
