Study on bolt / steel mesh / anchor coupling support technology of deep mining gateway

In order to solve the surrounding rock deformation,failure,hard to support problems of the mining gateway with a depth over 850 m in Yaoqiao Mine,with the analysis on the deformation failure features and deformation mechanics mechanism of the gateway,the surrounding rock of the gateway was determined as a high stress-joi nt soft rock. The main control factors affected to the deformation failure were deep depth,high geostress surrounding rock broken and the support mass and surrounding ro ck uncoupling and others. The coupling support theory and deep seam gateway three control support technology were applied. A new support technology with the bolt + Co mplex plate + key part anchor + steel bar mesh + floor angle grouting bolt pipe was provided. The application results of the transportation gateway in No. 7009 coal mining face of Yaoqiao Mine showed that the max convergence of the two sidewalls was 65 mm,the roof subsidence value was 38 mm,the max floor heave was 18 mm,the two sid ewall convergence,the roof subsidence and floor heave value were reduced by 84%in comparison with previous support. The new technology could improve the surroundin g rock stressed status of the gateway,could improve the completed loading capacity and the deformation of the gateway surrounding rock was effectively controlled.