Research on a novel combined sealing airbag for high gas working face corner

Corner sealing is an effective solution to air leakage and gas overrun in working face corner. Existing double anti-bagging sealing, air duct cloth sealing and airbags filling are difficult to seal the whole section, and light flexible airbag has little bearing pressure and cannot be recycled and reused. For the above problems, a novel combined sealing airbag for high gas working face corner is designed, which is made into combined structure of big airbag and miniature airbag to meet needs of different sealing sections of roadway. Physical tests of pressure resistance and impact resistance of the combined sealing airbag are carried out, and following conclusion are gotten: Deformation speed of the airbag is large in the initial phase of physical test of pressure resistance, and then decreases gradually with the increase of pumping pressure. When working pressure of the airbag achieves rated value (0.05 MPa), the airbag shape tends to be stable. With the quality increase of gangue impacting on the airbag, deformation value of the airbag increases, rebound height of gangue decreases, and kinetic energy absorption effect of gangue is better. The combined sealing airbag is tested in N1101 working face of Yuwu Coal Mine. The test results show that: When the combined sealing airbag is used to seal upper corner, average gas volume fraction in goaf increases by 13.85% compared to that when traditional air duct cloth sealing is used, the ones in upper corner and return airway decrease by 16.04% and 8.69% separately, and gas volume fraction changes smoothly with small fluctuation, which verify the combined sealing airbag can effectively solve local air leakage in goaf and gas overrun in upper corner; The combined sealing airbag can be recycled and reused, so as to decrease corner sealing cost.