Numerical Study on the Vibratory Compaction Mechanism of the Sand-Gabion Backfills in Underground Coal Mines

Coal mine backfilling can effectively prevent large-scale movement of rock formations, not only improving the overall production capacity but also protecting surface from destruction and maintaining original ecological environment. Backfilling extent backfills compactness are two factors determining supporting effect on overburdens in underground coal mines. To make full use aeolian sand as backfill materials mines desertification areas, Northwest China. Then, vibratory compaction was proposed to enlarge these sand-gabion by considering limited working space. After that, law particles during compaction, influencing parameters, gabion constraint ultimate were studied using discrete element software PFC3D microscopic point view. It found that more likely inter-squeeze under vibration than static load. Furthermore, there a series optimal parameters inner for each external strength. The frequency 50 HZ, excitation force 0.3 MPa, amplitude 40 KPa, time 4 s. Conclusions this study provide references enlarging goaf area