Research and Application of Prefilled Concrete Wall to Reduce the Size of Stopping Mining Coal Pillar

Table 3

Mechanical parameters of the “filling body-remaining coal pillar” structure.

Lithology	Compressive strength (σh)/MPa	Density (ρ)/kN·m^-3	Elastic modulus ()/GPa	Poisson’s ratio (μ)	Cohesion ()/MPa	Internal friction angle (φ)/°	Width ()/m	Width ()/m
Filling body	50	2456	11	0.22	3.33	44	10~22
Filling body	40	2456	9.3	0.22	2.95	40	10~22
Filling body	30	2456	5.9	0.23	2.65	37	10~22
Coal pillar	8	1440	0.982	0.23	1.7	28		15~ 3