Table 2 Basic parameters of coal seam in numerical simulation.

Compressive strength/\({\sigma }_{c}\)

MPa

6.5

6.3

6.6

Modulus of elasticity

GPa

1.2

0.62

1.03

Poisson’s ratio/\(\upmu\)

–

0.3

0.22

0.32

Tensile strength/\({\sigma }_{t}\)

MPa

1.1

0.3

0.37

Coefficient of leaching

m²s/kg

1e-13

1e-13

1e-13

Permeability

µm²

0.00272

0.00272

0.00272

Vertical stress/\({\sigma }_{v}\)

MPa

8.6

8.6

8.6

Minimum horizontal ground stress/\({\sigma }_{h}\)

MPa

12.2

12.2

12.2

Maximum horizontal ground stress/\({\sigma }_{H}\)

MPa

13.2

13.2

13.2