A Coupled Thermo-Hydro-Mechanical Model of Jointed Hard Rock for Compressed Air Energy Storage

Table 2

Material parameters and boundary conditions used in the example.

Parameters
Young's modulus 𝐸 of rock (GPa)	35
Poisson's ration of rock 𝜐	0.3
Density of rock 𝜌𝑠 (kg/m^3)	2800
Pore ratio 𝜙	1.0
Permeability coefficient 𝑘 (m^2)	1×10^−9
Permeability coefficient along crack 𝑘𝑓 (m^2)	—
Crack width 𝑑𝑓 (m)	—
Viscosity of air 𝜂 (Pa⋅s)	1.86×10^−5
Biot's consolidation coefficient 𝑏	0.95
Heat conduction of rock 𝛼𝑠 (W/m⋅K)	3
Heat conduction of air 𝛼𝑠 (W/m⋅K)	1000
Heat specific of air under constant pressure 𝐶𝑝,gas (J/kg⋅K)	1000
Heat specific of rock 𝐶𝑝,𝑠 (J/kg⋅K)	900
Expansion coefficient 𝛽 (1/K)	1.0×10^−5
Initial pressure 𝑃0 (atm)	1
Initial temperature 𝑇0 (K)	286.15
Air injection temperature 𝑇in (K)	296.65