Large Mining Height Of Overlying Strata Movement Regularities And Shallow Buried Depth Of Coal Seam Hydraulic Support Adaptability Research

Thick coal seam of coal resources in our country has proven reserves of coal in a proportion of33%above.Large mining height are broken mining technology gradually become one of the main mining thick coal seam mining process.In this paper, to make up for the12407big mining height are broken on the fully mechanized face,bay51203big mining height are broken at the scene of the fully mechanized face is based on the mine pressure observation data.was studied by numerical simulation and theoretical analysis,different mining height are broken when the characteristic of mine pressure and the motion law of overburden rock, and the shallow buried deep under big mining height are broken hydraulic support adaptability to study。 Main conclusions are as:(1) Based on4.9m mining height are broken in bulianta coal mine12407working face and coal mining working face no.51203in5.8m mining height are broken on the bay mine pressure observation into the comparative study, known at the time of mining height are broken is larger, periodic weighting interval will be smaller accordingly, the support working resistance will increase along with the increase of mining high has nonlinear trend; Support working resistance will increase along with the increase of mining height are broken is nonlinear trend, at the same time on both sides of the fully mechanized face in small hydraulic support’s working resistance than the middle section, mine pressure appear features more obvious with the increase of mining height are broken.(2)Through the numerical simulation software FLAC3D, respectively established stope and tank model to simulate underground pressure of surrounding rock under the influence of mining laws. Draw gateway surrounding rock at the top of the old during first weighting and periodic, mining working face in serious effects on the stress, deformation and plastic zone. In specific numerical terms, the result of the main roof cycle pressure to deformation of the gateway and the extent of plastic zone of surrounding rock is bigger.(3) By shallow buried depth of coal seam roof research concluded a series of structural mechanics analysis and calculation of the shallow buried depth of coal seam fully mechanized hydraulic support’s working resistance calculation method, for hydraulic support adaptability analysis, understanding of the scaffold structure design method.