Application of advance supporting technology with pipe-shed and capsular bag grouting in roadway through goaf

In order to ensure safety during driving in gob and stability of surrounding rock in service period, taking equipment roadway of No.1 middle yard as research object, this article studied the adaptability of pipe-shed and capsular bag grouting support technique for gob roadway support by the methods of theoretical analysis, field test and field monitoring, and using the method of cross distribution point continuouslly observed roadway surface displacement for two months, the study results showed that the pipe-shed and capsular bay grouting as advance supporting and the fiexible supports+backfill grouting as permanent support had the advantages of rapid driving speed and support stability, and monitoring results of roadway surface displacement showed that surrounding rock deformation was effectively controlled, the maximum roof convergence was 60 mm, the maximum displacement of side-to-side was 130 mm, the maximum floor heave was 80 mm.