Study on the Migration Law of Overlying Strata on the Working Surface of Large Mining Height in Y.C.W Coal Mine

The migration law of overlying strata on working face is great significance for safe mining face. In this paper, theoretical calculation, numerical simulation, and similar simulation are used to study the distribution characteristics, migration, fracture key in 130204 Y.C.W coal mine relationship between development height water flowing fractured zone spatial position weak aquifer. calculation results show that there “one main two sub” face, which play an important role controlling rock movement. Numerical first weighting step distance direct roof about 30-40 m. initial interval basic 70-80 m, periodic 23.5-25 After multiple subcritical layer located caving zone, second finally bending subsidence zone. final 24 130 Since water-conducting connected passes through with water-bearing property, it possible permeability accident Therefore, order ensure safety should be detected released advance during