Value | Item | Value | |
---|---|---|---|

The top depth of the coal mine/m | 400 | The scale of the model | 85m*95m*48m |

Average thickness of the coal stratum/m | 48 | Initial pressure/ kPa | 750 |

Average porosity | 0.04 | Initial methane content | 11.5m^{3}/t |

Average Permeability of matrix/(10^{-3}μm^{2}) |
0.05 | Density of coal rock/(kg/m^{3}) |
1300 |

Average Permeability of fracture/(10^{-3}μm^{2}) |
0.5 | Initial stress/kPa | 810 |

Biot's constants | 1.0 | fracture interval/m | 40 |