Balanced Yield Control Technology of Soft Rock Roadway in Deep Mine

According to the difficult support problem of the mine deep soft rock roadway in Haishiwan Mine, based on the strength intensified theory and the energy balance theory of the surrounding rock, the numerical simulation and the industrial contrast test method were applied to the study on the difficult support and a concepti on of the high strength pre-stress balanced yield surrounding rock control was provided.With a constant resistance yielding tube set between the bolt plate and the nut, the yielding tube at the different location of the mine roadway would have a related degree deformation occurred with the different stress of the surrounding rock in the mine roadway. The surrounding rock in the mine roadway would be in a balanced stressed status. The industrial experiment showed that the balanced yielding role of the bolt could make the surrounding rock of the mine roadway fully release the initial elastic deformation energy and could improve the reliability of the support system.After 25~35 days, the experiment roadway would be in a stable status, the max displacement of the roof was 130 mm, the max convergence of the two sidewalls was 110 m m, the convergence of the roadway cross section was reduced by 50% and the support difficulty of the deep soft rock roadway in Haishiwan Mine was solved.