Analysis on roof subsidence law and gangue load bearingcharacteristics in gangue filling goaf

In order to study the subsidence mechanism of the roof in the goaf and improve the control effect of the gangue on the roof,taking the F5001 working face of a mine as the background,in combination with the field measurement and the numerical simulation,this paper,analyzed the spatio-temporal evolution law of the roof subsidence in the goaf and the bearing characteristics of the gangue area.The results show that the value of the roof subsidence of the No.F5001 working face is 425.50 mm,which accounts for 19.34% of the height of the working face,and the value of the stress of the filling body is 2.87 MPa.All of them have reached the basic stability after advancing 100 m in the working face,and the evolution law has obvious stage characteristics; the compression process of the filling body in the goaf is gradually increasing.After the strain hardening process,the compression modulus changes basically 68.39 MPa after the working face is pushed to 100 m,and the characteristics of the roof subsidence along the tilt direction are characteristic along the direction sequence.