The Movement Characteristics of Coal Granular Body in Excavating Rescue Channel in the Collapsed Body

Table 2

Mechanical property of model.

Number	Material properties	Particle quantity	Particle size (mm)	Density (kg·m^−3)	Tensile strength (MPa)	Local damping coefficient	Excavation position	Natural repose angle
1	Coal	1458	100	1650	0.51	0.3	Shear stress part	16°
2		1458	100				Shear stress part	26°
3		1458	100				Shear stress part	36°
4		1458	100				Shear stress part	46°
5		1458	100				Middle lower part	46°
6		353	200				Shear stress part	16°
7		353	200				Shear stress part	26°
8		353	200				Shear stress part	36°
9		353	200				Shear stress part	46°
10		353	200				Middle lower part	46°
11		742	100–200				Shear stress part	16°
12		742	100–200				Shear stress part	26°
13		742	100–200				Shear stress part	36°
14		742	100–200				Shear stress part	46°
15		742	100–200				Middle lower part	46°