Damage and Failure Evolution Mechanism for Coal Pillar Dams Affected by Water Immersion in Underground Reservoirs

Table 1

Physical and mechanical properties of coal.

Volumetric weight (kN·m^−3)	Elastic modulus (GPa)	Shear modulus (MPa)	Tensile strength () (MPa)	Cohesion (MPa)	Internal friction angle (°)	Poisson ratio
15.00	14.00	3.00	0.30	1.80	25	0.22