Numerical Analysis on Grouting Reinforcement Effect of Instable Surrounding Rock in Structure Zone

According to the actual condition of +1 150 m Level transportation roadway in a region with several faults in Tailai Mine, in order to solve the high conver gences of the roof and floor as well as the two side walls, based on the analysis on the roof and floor strata structural and the experiments of the lab, the grouting reinfo rcement measures of the surrounding rocks were provided under the conditions of the previous support parameters unchanged.The FLAC numerical software was appli ed to the comparison analysis on the surrounding rock reinforcement effect before and after the grouting.The results showed that when only "a bolt+shotcreting+anchor" support was conducted, the deformation speed and the deformation value all would be high and the combined mass of "surrounding rocks and support" would be in a so ft and failure status.With the application of the grouting reinforcement and "the bolt+shotcreting+anchor combined support method, the surrounding rock could be effecti vely controlled.The max subsidence value of the roof would be 140 mm, the max floor heave value would be 80 mm and the max convergence of the two side walls woul d be 125 mm.