Evaluation of Gas Migration and Rock Damage Characteristics for Underground Nuclear Waste Storage Based on a Coupled Model

Table 1

Parameters in the calculation.

Parameter	Value	Unit
Elastic modulus,	2.7	GPa
Elastic modulus of rock grains,	8.1	GPa
Poisson’s ratio,	0.22	-
Initial porosity,	0.008	-
Initial permeability,	1×10^−17	m^2
Klinkenberg effect, b	1.44×10^5	Pa
Langmuir pressure constant,	7.2	MPa
Langmuir volume constant,	0.015	m^3/kg
Langmuir volumetric strain constant,	0.013	-
Density of rock,	1,250	kg/m^3
Homogeneity index, m	2	-
Uniaxial compressive strength,	9	MPa
Uniaxial tensional strength,	2	MPa
Internal friction angle,	30	°
Gas viscosity,	1.84×10^−5	Pa·s
Density of gas,	0.717	kg/m^3
Damage-permeability effect coefficient,	4.5	-