Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi

Table 2

Coefficients in equation (3) for three types of rocks.

Rock	Constants
	AT (MPa)	BT (–)
Mchenga arkose sandstone	3.44	0.62
Mchenga fine-grained sandstone	5.50	0.71
Kimachi sandstone	5.42	0.55