【摘要】 为了在井下条件实测采动卸压煤体变化的渗透率,从瓦斯抽采的难易程度出发,通过六氟化硫示踪气体现场参数测试和抽采数据统计对被保护层卸压煤体渗透率进行了实测研究。通过对实测结果的分析,认为被保护层卸压煤体渗透率的变化与煤体应力状态有一定相关性,在保护层开采过程中,距离不同的被保护层卸压煤体都经历了渗透率小幅升高—小幅下降—急剧升高3个过程,距离越远的卸压煤层渗透率变化幅度越小,其变化趋势相对保护层工作面距离也越滞后。更多还原

【Abstract】 In order to research on the mining-induced permeability characteristics,based on the degree of difficulty of gas-drainage,by means of SF6 tracer gas and drainage statistical data,the permeability characteristics of protective layer was studied. Through the experimental analysis,the permeability and the state of stress are relevant. Through the mining process of the protective layer,the permeability of the depressed coal seam experienced a slight variation. The amplitude of variation decreases with the increase of the distance between coal seams and the change will lag behind the working-face of the protective layer.更多还原