Technology of Fully-Mechanized Coal Mining Face Passing Through Overburden Concentrated Coal Pillar and Goaf

In order to solve the large area of roof falling accident problem possibly occurred during the mining process of fully-mechanized coal mining face passing through overburden concentrated coal pillar and goaf, taking No.31201 fully-mechanized coal mining face of Shigetai Mine as a study object, an analysis was conducte d on the causes of the roof falling accident occurred in the mining process of the coal mining face passing through overourded concentrated coal pillar and goaf.The res ults showed that according to the mine strata pressure observation condition of the coal mining face, three periodical roof weighting abnormal areas of the coal mining f ace were all in concentrated coal pillar of the room and pillar mining block and the goaf area in overburden No.22 seam, and a secondary roof structure occurred in No. 31201 fully-mechanized coal mining face which caused by the concentrated coal pillar and goaf area in No.22 seam.Influenced by the mining, the concentrated coal pill ar and goaf in No.22 seam were failed and lost stability, dynamic mine load formed and finally a large area of roof falling accident occurred.According to the roof falling accident, the mine pressure observation, microseismic monitoring and measuring, internal displacement monitoring and measuring, surface ground observation, overbur den concentrated coal pillar blasting and other technical means applied could provide safety and technical protection to the continued mining of the coal mining face.