Table 1 Physical parameters of porous media.
From: Study on optimization of layout parameters of high-level boreholes in Pingdingshan coal mine
Parameter name | Parameter symbol | Value and unit |
|---|---|---|
Young's modulus | Ee | 2.713e9[Pa] |
Poisson's ratio | Mu | 0.339 |
Coal density | Densc | 1250 [kg/m3] |
Gas density | Densg | 0.717 [kg/m3] |
Dynamic viscosity | Visco | 1.84e−5 [Pa·s] |
Langmuir constant | PL | 6.019e6 [Pa] |
Langmuir volume strain constant | Sorpl | 0.02295 |
Initial porosity of coal | Phi0 | 0.084 |
Initial permeability of coal | K0 | 2e−14 [m2] |
Raw coal gas pressure | Pi0 | 0.5e6 [Pa] |
Negative pressure extraction | Pa | 20000[Pa] |
