Study on gangue filling material beside roadway in ultra-high water filling working face

Liang Xu; Xue Xiaoqiang; Gao Linsheng

doi:10.19896/j.cnki.mtkj.2025.03.010

Abstract：Aiming at the problem of material selection of gangue filling body beside roadway under the condition of gob-side entry retai-ning in ultra-high water filling working face,taking a typical coal mine project as the background,the numerical simulation method was used to establish the numerical model of gangue filling and roadway retaining in ultra-high water filling working face.The displacement of gangue filling body beside roadway and filling body beside roadway,the subsidence of roadway roof,the peak stress and distribution characteristics of filling body beside roadway were studied,and the law of stress and deformation of gangue filling body beside roadway and roadway in ultra-high water filling working face was revealed.The results show that siltstone,mudstone and fine sandstone are used as gangue filling materials at the side of the roadway when the mining height of the working face is 3 m.Under the design conditions of 2 m wide and 2 85 m high,the peak stress of roadside gangue backfill is 65.5 MPa,68.4 MPa and 79.2 MPa respectively,and the maximum subsidence of roadway roof is 148 mm,135 mm and 127 mm respectively.On the whole,the pressure of roadway roof is the largest and the subsidence of roadway roof is the smallest when fine sandstone is used as roadside filling material.Therefore,the filling effect of fine sandstone filling material is the best.