采动对煤层渗透性的影响探析

Analysis of the influence of mining on the permeability of coal seam

通过研究回采工作面煤层渗透性随采动的变化规律,得出了在卸压区进行浅孔抽采和应力集中区抽采卸压的必要性和可行性。通过建立应力集中区节理演化模型,分析得出应力集中带煤层节理、裂隙发育受最大主应力方向、大小影响,进而影响局部渗透性变化。应力集中区瓦斯抽采钻孔应布置在局部渗透性增大区域。

The change of permeability of coal seam in coal mining face is studied, and the necessity and feasibility of extracting and unloading pressure in shallow hole and stress concentration area is obtained. Through the establishment of the model of the joint evolution in the stress concentration region, the analysis show the stress concentration zone of coal seam, the development of the maximum principal stress direction, the size influence, affect the local permeability change. Stress concentration area gas drainage and drilling holes should be arranged in the local permeability increasing area.