Application of high water filling materials in pre-excavation retreat roadway
In response to the problems of large deformation of surrounding rock and difficult maintenance caused by the impact of mining dynamic pressure on the pre-excavation retreat roadway of No.8107 Face in Majiliang Mine,a high water material segmented filling process was proposed based on the production geological conditions of the working face.On site,a high water cement ratio of 3∶1 was used to fill the working face with high water materials,and the uniaxial compressive strength reached 7.2 MPa after 28 days.The practical application results showed that the control effect of the surrounding rock in the retreat roadway of No.8107 Face was good,and there had been no large-scale roof collapse accidents in the working face.The integrity of the filling body was good,showing good plastic deformation and yielding performance;after the opening of the retreat roadway,the roof subsidence speed was basically maintained at 0.7～1.6 cm/d,which met the needs of the working face support retracement.
万方数据
维普
