Research On The Roof Disaster And Its Control Technique During Full Zone Mining In Ultra Close Coal Seams By Similar Simulation

There are several methods to exploit the close distance coal seams, for example, to exploit only one of the close seams, to exploit in slices, to exploit as a whole coal seam, and so on. This dissertation studies on the possibility and techniques of full zone mining in close coal seam No.9and No.10, and compares the full zone mining with the former one seam mining. It gets the superiority of full zone mining and analyzed the security problems of full zone mining and the points that should be paid attention during the exploitation. The underground pressure of the coal seam No.10is not very high, which is also not special, and the current support method can meet the working face’s demand. While the full zone mining is more complicated than the single coal seam mining, and the hard roof causes a higher working face pressure, which needs a stronger support strength and support techniques. The technique of full zone mining working face is similar with it of large height mining, and the preparing of major equipments and organization of producing techniques is also the same. After the on-site underground pressure observation, numerical simulation and similarity simulation experiments, the exploiting method, working face’s support parameter, and security technology related are acquired.