RESEARCH ON PHYSICS AND MECHANICS PERFORMANCE OF PASTE-LIKE BACKFILL MATERIAL IN COAL MINES

Physics and mechanics performance paste-like backfill material in coal mine such as strength, allowable specific pressure and compressive rate was researched by experiment. The results showed that after curing for 8 hours the backfill material could achieve sufficient strength to keep stable with the content 3% of binding material and the slurry density 77%; After curing for 90 days the backfill material could achieve sufficient allowable specific pressure to avoid insertion of pros into floor with the content 3% of binding material and the slurry density 77%; Paste-like backfill material had far smaller compressive rate than sand, fly ash and gangue powder.