CHINA MINE ENGINEERING

The fractured rock stratum at large fault areas causes an overall poor stability and brings great difficulty in support of roadways crossing these areas. To solve the problem, a study is carried out on the 2309 return airway crossing the F19 fault of Cuijiagou coal mine. In the study, surface grouting technology is adopted for pre-reinforcement and anchor bolt+U-shaped steel for support of the airway at the fault area, followed by a 180d support effect monitoring of the airway roof. The results show that, compared with the 2311 haulage roadway without grouting reinforcement, the maximum displacement of the airway in the deep part is reduced by 60%, and by 70% in the shallow part. The airway at the reinforced area shows good integrality, without subsidence or large area collapse.