Experimental study of the evolution pattern of overlying fissure in ascending mining system
The safety of coal seam mining is affected by the evolution of vertical fissure in the overburden strata with ascending extraction of lower coal seam.In this paper, similar material simulation method was used in the experiment to research the overburden rock fissure about the ascending mining at Xichagou coal mine district of Northern Shaanxi.The result shows that: after the mining of the lower 5-1 seam at this coal, overburden presents the typical characteristics of three zones;after the sixth periodic weighting, ascending crack through strata, which is located above 3-1 seam at about 60 m, is formed in the process of later periodic weighting with the different pressure degree in the direction of caving angle nearly coal wall on one side of working face, the evolution process is that the crack opens when pressure comes and gradually closes when pressure has gone, the issue which crack through strata connects the surface can affect safety of the coal seam mining and its upper seam;Ascending mining of 3-1 seam working face havent the sliding instability and bench convergence phenomena in the vertical crack through strata, the working face can finish the continuous advance.The study of ascending safety mining has significant reference to other similar coal mine.
X.P.Shao W.H.Yang X.Q.Yuchi
Key Lab of Western Safe Mining and Hazard Control, College of Energy Engineering, China Educational Ministry, Xian University of Science and Technology, Xian, China
国际会议
The 3rd ISRM Young Scholars Symposium on Rock Mechanics(第三届国际岩石力学青年学者论坛)
北京
英文
373-377
2014-11-08（万方平台首次上网日期，不代表论文的发表时间）