One driving completed gateway support technology applied to open-off cut in fully-mechanized coal mining face under goaf

In order to realize one driving completed gateway support of E9.10- 19070 open-off cut under goaf,a elastic-plastic mechanics theory was applied to analyz e the roof stability of the open- off cut. The surrounding rock type was obtained from a fuzzy comprehensive judgment.From surrounding rock stress,surrounding rock stren gth,gateway support and equipment selection aspect,a feasibility on one support of open-off cut in E9. 10-19070 seam was discussed .According to the engineering analogy method,one driving completed gateway support plan of the open-off cut was determined and the monitoring and measuring was conducted on the surrounding rock deforma tion. The study results showed that a goaf in E8-19070 seam was above the open-off cut in E9.10-19070 seam,a max failure depth of the floor was8 m,the roof with 10 m a bove the seam was an integrated strata,the surrounding rock of the open-off cut was in工type medium stable and support mode was a bolt 1 steel mesh 1 anchor.The analy sis showed that the one support of the open-off cut in E9. 10-19070 seam would feasible and certain support parameters and construction sequence of the one driving com pleted gateway were set up.After the one driving completed gateway support conducted,a max value of the roof bed separation above the open-off cut was 21 mm,the max value of the roof and floor convergence was 170 mm and the max convergence of the two sidewalls was 80 mm.The one driving completed gateway support of the open-off cut under the goaf was realized and the economic and social benefits were obvious.