Study On Conversion And Application Of "O-S"-Shaped Overlying Multi-Strata In Mechanized Mining Field

The fundamental cause of stope mine pressure appear fundamental is caused by the change of the spatial structure of overlying strata ofcoal seam mining.The relationship between the coal seam mining and the structural form of the roof space structure and its change is the important supplement and depth to the mine pressure theory.This paper takes Binxian Shuiliandong mine3802working face as the engineering background,under the influence of geological conditions,3802working face mining process will experience a side to face mining to the transformation of the boundary conditions. A systematic study of the relationship between the structural transformation of the O-S type overburden and the characteristics of the pressure in the same fully mechanized coal mining field is carried out. The mechanism of the pressure occurring is researched in the coal mine under the same fully mechanized O-S structure,and it is very important to reduce the cost of roadway support and ensure the safety of mine.For the similar conditions, the safe mining of special coal seam has certain reference significance and practical value of engineering.This paper is based on the theory of overlying rock spatial structure,and mining science, rock mechanics, materials mechanics, elastic-plastic mechanics, engineering geology and other multi-disciplinary theory are used fully, Combined with the pressure theory, laboratory mechanics experiment, FLAC3D simulation, TECPLOT graphics processing and engineering application of the research methods,With the establishment of a fully mechanized caving face "O-S" type overburden structure of lateral overburden structure model and its parameters are determined.Reveals the "O" and "s" type and "O-S" type structure of overlying strata of immediate roof and the evolution law of the roof, thick hard strata, overburden structure development height, type of overlying strata spatial structure conversion and evolvement law. The special thick coal seam roadway side under the "S" type of strata structure stress distributed law of empty are revealed,and it determines the different sections, different parts of the roadway, the supporting parameters in different periods.This study provides an important scientific basis for the determination of the coal pillars, the prevention and the parameters of the roadway support in the face of a Side goaf to two sides goaf. The spatial structure theory of "O" type overlying rock and the spatial structure theory of "S"-type overlying strata in double mining stope are presented in this paper.The rock strata range is the sum of the rock beams and the strata of the old top and the old roof, and the strata are dynamic.In this paper, the pressure of the rock during the conversion of the O-S structure is intense,and the overlying strata movement is complex,and there is not a specific spatial structure. The basic roof and immediate roof have a greater separation.this paper considers the space structure of the "S" type of overburden.Under the"S" type overlying strata spatial structure,the structural features have the "rock-beam" structure in the lateral roof of road along next goaf. It will form the lower separation area, middle and upper structure zone area above the roadway,and they influence the stability of roadway.Mine pressure and rock strata control scheme is designed,and the relevant achievement of the "O-S" overlying strata spatial structure is verified.