Study on surrounding rock reinforcement technology of strong mine dynamic pressure large deformation roadway group

According to the urgent reinforcement difficulty of broken surrounding rock in intensive roadway group with narrow coal pillars influenced by mining activitie s,the site peep,theoretical analysis and underground test method were applied to analyze and study surrounding rock deformation and failure mechanics,features and reinf orcement measures of roadway group. The study results showed that mine roadway group with narrow coal pillars were in the stress concentrated zone. Influenced by high dynamic pressure,the surrounding rock of roadway would have further bed separation,dislocation motion,crack opening and other discontinuous deformation and thus the I arge deformation and stability lost of surrounding rock occurred. The failure locations were mainly concentrated at the two sidewalls,roof and floor.Therefore,a comprehensi ve reinforced measures with the grouting to recover the integration of surrounding rock and the anchor active support to recover the self loading capacity of surrounding ro ck were provided. The floor heave value of roadway was 32 mm,the convergence between two sidewalls was 28 mm and the surrounding rock high deformation of roadway was effectively controlled.