Research on Influence Law of Overlying Rock Fracture on Filling Body During Big Mining Height Gob-side Entry Retaining Mining
The stability of the filling body is the key to the safe mining of the high mining height goaf retaining roadway working face.Theoretical analysis,numerical simulation,and on-site measurement methods are used to study the bearing characteristics of the filling body under roof load,the impact law of mining on the stability of the filling body,and to evaluate the safety of the filling body.The research results show that after pouring the filling material,the load on the top plate gradually becomes apparent,and the stress on the filling material gradually increases.After 7 days of pouring,the maximum stress is 18.7 MPa,and the maximum subsidence at the top is 570 millimeters;The maximum stress and deformation of the filling body during the initial pressure is the most dangerous working condition.The selected KJ-I mining pouring material and reserved parameters meet the requirements for use in the industrial test of Xiegou Coal Mine.
Big mining heightGob-side entry retainingRoof fractureFilling body stabilitySecurity control
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