Bolt/steel mesh/anchor coupling support technology of soft rock roadway in ultra deep mine

According to large deformation failure problems occurred in surrounding rock of mine roadway with a depth over 1 200 m in Xingcun Mine ,site survey,indoor test,numerical analysis and other method were comprehensively applied to study on failure mechanism and stability control technology. The analysis showed that the deep depth of mine roadway,high geostress level,aluminous mudstone swelling with water and others would be major causes to have large deformation failure occurred in the mi ne roadway and to have the floor heave.Meanwhile ,the previous support method of open floor under the symmetrical layout would be anther key factor to cause unsymmetr ical large deformation failures occurred in the mine roadway under the high level structure stress. According to the analysis on the site engineering geological conditions,in combination with the coupling support conception,an unsymmetrical coupling support technology with the composite pallet + bolt 1 steel mesh 1 shotcrete + anchor in key lo cation + anchor pipe in floor corner was provided. The numerical simulation results showed that new support technology could realize the coupling role with the surroundin g rock of the mine roadway and could highly improve the loading capacity of the mine roadway. The site engineering application of the new support technology was conduct ed and the monitoring and measured results showed that the new support technology could have an excellent control effect of large deformation occurred in deep mine roa