Numerical Analysis on the Storage of Nuclear Waste in Gas-Saturated Deep Coal Seam

Table 1

Parameters for numerical simulation.

Parameter	Value used
Elasticity for coal (, MPa)	2713
Poisson’s ratio ()	0.339
Coal density (, kg/m^3)
Coefficient for sorption deformation (, kg/m^3)	0.0156
Initial permeability of coal matrix (, mD)	0.002
Initial permeability of coal fracture system (, mD)	1
Initial porosity of coal matrix ()	0.05
Methane dynamic viscosity (, Pa·s)
Langmuir volume constant (, m^3/kg)	0.048
Langmuir pressure constant (, MPa)	1.57
Pressure coefficient (, MPa^-1)	0.07
Temperature coefficient (, K^-1)	0.02
Pressure at standard condition (, MPa)	0.103
Thermal expansion coefficient for solid coal matrix (, K^-1)
Specific heat capacity of gas (, kJ/(kg·K))	1.25
Specific heat capacity of coal (, kJ/(kg·K))	1.62
Thermal conductivity of coal (, J/(m·s·K))	0.2