矿井采空区倾角对易燃气体富集分布特征的影响研究

Study on the influence of dip angle of goaf on the enrichment and distribution characteristics of flammable gas

为准确掌握矿山井下易燃气体的分布及流动规律,加大矿区地质灾害的防治力度,其中矿井采空区不同倾角对易燃气体的储存和分布有重要的影响,本文利用FLAC^(3D)(Fast Lagrangian Analysis of ontinuain 3 Dimensions)软件作模拟分析,针对矿层各个倾角下易燃气体储存空间的分布特征作探究,结合采动上覆层“三带(冒落带,裂隙带和弯曲下沉带)”中易燃气体的卸压运移规律,对不同倾角采空区完全卸压带易燃气体富集区的分布作系统的研究。研究发现:0°~50°的倾角范围,采空区的易燃气体富集区呈现“六边形”,随采空区倾斜,其总面积和中心倾向线两侧的面积受采空区倾角影响不大,其中心水平线两侧的面积和竖直总高差受采空区倾角影响较大。

In order to accurately grasp the distribution and flow law of flammable gas in the mine and strengthen the prevention and control of geological disasters in the mining area,in which different dip angles of goaf have an important impact on the storage and distribution of flammable gas,this paper uses FLAC^(3D)(Fast Lagrangian analysis of continuous 3 dimensions)software for simulation analysis,According to the distribution characteristics of flammable gas storage space under each dip angle of the seam,combined with the pressure relief and migration law of flammable gas in the"three zones(caving zone,fracture zone and bending subsidence zone)"of mining overlying layer,the distribution of flammable gas enrichment zone in complete pressure relief zone of goaf with different dip angles is systematically studied.It is found that in the dip angle range of 0°~50°,the flammable gas enrichment area in the goaf presents a"hexagon".With the dip of the goaf,the total area and the area on both sides of the central dip line are not affected by the dip angle of the goaf,and the area and total vertical height difference on both sides of the central horizontal line are greatly affected by the dip angle of the goaf.