Abstract: To control the large deformation of surrounding rock of entry with a large section near 20 m² in Chengzhuang mine under the dynamic stress,the failure characteristics and the deformation mechanism of the surrounding rock were studied using numerical simulation method and field measurement method.The results show that the increasing section and a strong recovery disturbance will cause the asymmetrical deformation of surrounding rock of entry,then produce partition destruction inside,that surrounding rock deformation presents the stage characters under the recovering and the driving stress,and in this case,the traditional mono-supporting patterns are difficult to work properly,that a cooperative supporting technology of a new "three high" bolt and the partition grouting reinforcement is required urgently,that after adopting the supporting technology,the floor heave of entry can be reduced by 450 mm,and the convergence of two ribs can be reduced by 800 mm,indicating the surrounding rock deformation of entry has been effectively controlled.

Key words: large section, dynamic pressure roadway, deformation instability, "three-high"bolt support, grouting reinforcement, cooperative support