Roadway Side Support of “Finite Deformation” in Gob-side Entry Retaining Under Hard Roof

Based on the laws of strata behaviors in gob-side entry retaining under the thin coal seam and hard roof, support model of roadway side is built. The subsidence of roof is reserved and coal wall’s capacity is used completely; both single props and gangue belt are used in the support of filling area’s roof and pressure-released boreholes are used for cutting roof and cutting off the connection between the roof of goaf and the roof of roadside in time to become the protecting block of roadside supporting. By using numerical simulation software FLAC^3D, the gob-side entry retaining of three temporary supporting schemes is simulated, through a comparative analysis of the roof subsidence and the angle of roof rotation, it is determined that both single props and gangue belt are used as supporting roof. The practice shows that the effect of gob-side entry retaining is good when the width and height of the concrete filling body is 2.0 m and 1.5 m in 16105 working face of Binhu Coal Mine, and the production needs of the next working face are basically satisfied.