Study on Sound Propagation Performance of Mechanized Coal Gangue-Fine Sand Filling Body

Table 1

Physical properties of mechanism gangue.

Specific gravity	Loose bulk density (kN·m⁻^3)	Dense bulk density (kN·m⁻^3)	Maximum porosity (%)	Minimum porosity (%)	Angle of repose (°)
2.65	15.848	17.456	41.31	32.78	29.36