Research on reinforcement and treatment technology for softrock roadway under dynamic pressure

According to the serious surrounding rock deformation and difficult support technical problems of the mine soft rock roadway under the influences of the dynamic pressure, take a transportation dip in Wantian Coal Mine as a study object, a theoretical analysis was applied to establish a plastic scope calculation model of the mine roadway and a maximum plastic zone scope obtained in the top and two sidewalls was 9.8 m and 13.6 m individually. Meanwhile,a comparison and analysis were conducted on the dynamic pressure affected to the development scope of the plastic zone and the mining operation of the coal mining face in the overburden strata above the mine road could have obvious influences to the stability of the mine roadway. In combination with the peering results from the surrounding rock of the mine roadway and the theoretical calculation, the failure scope of the plastic zone in the mine roadway was obtained, a full cross section double-shell bolt and grouting reinforcement support technology combined with the shallow and depth grouting was provided and the industrial trial in the underground mine was conducted. The practices showed that after the double-shell grouting applied, the full cross section high pre-stressed bolt and steel mesh support could effectively control the surrounding rock deformation of the soft rock roadway under the influences of the serious dynamic pressure.