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

Table 5

Physical and mechanical properties of coal after weakening of the F1 processing unit.

Moisture content (%)	Volumetric weight (kN·m^−3)	Elastic modulus (GPa)	Shear modulus (MPa)	Tensile strength () (MPa)	Cohesion (MPa)	Internal friction angle (°)	Poisson ratio
0	15.00	14.00	3.00	0.30	1.80	25	0.22
4.72	15.00	6.69	1.43	0.11	1.74	21.82	0.22