Abstract:
Based on the geological conditions of loose and broken surrounding rock of transportation roadway in 1404 working face of a mine, active advance support with grouting anchor cable is used to control the stability of surrounding rock.FLAC
3D software is used to simulate the leading abutment pressure and the deformation characteristics of roadway surrounding rock in the coal mining process, and the corresponding change characteristics of roadway surrounding rock in front of the working face under different advancing distances are analyzed.According to the simulation results, support parameters and grouting material ratio are designed, and engineering monitoring and verification are carried out.The results show that during the advance of the working face, the influential range of the advance abutment pressure is about 20 m, and the peak value is about 4~5 m on the advance working face.With the further increase of distance from the working face, the whole surrounding rock shows asymmetric deformation, and the deformation of the stoping side is larger than that of the non-stoping side.In view of the large deformation on the side of the stoping wall, three high-strength bolts are added to each row of the side of the stoping wall, and the other parts are reinforced by grouting anchor cables.In order to shorten the setting time of grout, the water-cement ratio of grout is 1∶1, and the volume ratio of cement slurry and water glass is 1∶0.5.Engineering monitoring shows that the deformation of roadway surrounding rock tends to be stable after 20 d, the deformation of two sides is 80~110 mm, the subsidence of roof is 160~200 mm, and the supporting facilities work normally, which indicates that the active advance supporting technology of grouting anchor cable can effectively control the deformation of roadway surrounding rock.