浅埋深薄基岩综放工作面超前支承压力分布规律的埋深效应

Burial-depth Effect of Advance Abutment Pressure Distribution Law in Fully Mechanized Top-coal Caving Face of Shallow-buried Coal Seam with Thin Bedrock

采用数值模拟的方法,研究了煤层埋藏深度对浅埋深、薄基岩、厚松散层特厚煤层综放开采超前支承压力的影响,研究结果表明:随着煤层埋藏深度的增加,综放工作面超前支承压力峰值大小和峰值距煤壁的距离呈对数增加,而支承压力集中系数呈线性减小。煤层埋藏深度的增加有利于顶煤的破碎,进而间接提高了特厚煤层采用综放开采的采出率。

In this paper,study was made by using numerical simulation method on the influence of the burial depth of coal seams upon the advance abutment pressure in fully mechanized top-coal caving face of the shallow-buried,thick and loose coal seam with thin bedrock. Research results showed that with the increase of the burial depth of the coal seam,the peak value of the advance abutment pressure in the fully mechanized top-coal caving face and the distance between the peak value and coal wall increased logarithmically and the concentration factor decreased linearly. The increase of the burial depth of coal seams was in favor of top-coal breaking,which then indirectly increased the coal recovery rate in fully mechanized top-coal caving face of extra-thick coal seams.