Effect of the Water-Air Coupling on the Stability of Rainfall-Induced Landslides Using a Coupled Infiltration and Hydromechanical Model

Table 1

Components of the constitutive relations.

Constitutive relations	Expression	Description
Effective stress		is a bishop-type skeleton stress tensor, is the Biot coefficient, and is the identity tensor
Soil-water characteristic curve (SWCC) [30]		and are the model parameters
Relative permeability of water [31]
Relative permeability of air [32]
Intrinsic permeability [25]		is the initial porosity, is the initial intrinsic permeability
Density of water [29]		,
Density of air