采动煤体渗透率示踪监测及演化规律

Evolution law of mining coal permeability by real-time tracer monitoring system

以潞安矿区五阳煤矿7601工作面为观测现场,利用自主研发的采动煤体渗透率实时监测系统现场实测了采动条件下煤体渗透率的变化情况.通过对监测结果的分析,认为在采动过程中煤体渗透率的变化主要经历了缓慢增加—突然下降—突然增加3个阶段,产生这一现象的原因是:在采动条件下,煤体分别经历了弹性变形—塑性变形—卸载膨胀3个过程,在不同阶段煤体的属性发生了很大变化,使其渗透率随之发生改变.

Selected the 7601 coal caving face in Wuyang coal mine, Lu＇ an Group Company for the observation site, studied the alteration of coal permeability during mining with SF6 tracer technique. It is found that there are three stages during mining： increasing slowly, decreasing quickly and increasing quickly. The reason for this phenomenon is there are three stages for coal deformation： elastic deformation, plastic deformation and plastic failure, in different stages the porosity are different, and the permeability is changing too.