Study on Prediction of Outburst Risk of Excavation Face by Initial Gas Emission

Table 1

Model parameters.

Borehole diameter (mm)	Length (m)	Elasticity modulus (MPa)	Cohesion (MPa)	Internal friction angle (°)	Poisson ratio	Coal body’s tensile strength (MPa)	Coal density (kg·m^-3)	Dynamic viscosity of gas (Pa·s)	Density of gas (kg·m^-3)	Temperature (K)
40	1.5	677	2.2	35	0.3	2.2	1300	1.85e-5	0.726	305