EXPERIMENTAL STUDY ON THE POROSITY AND PERMEABILITY OF DISTURBED COAL UNDER CONFINED PRESSURE

By using the porosity and permeability measuring system,the porosity and permeability of different types of disturbed coal samples with different qualities are measured.The results show that the porosity and permeability of disturbed coals are decreased with confined pressure,and there are different variation laws in the coals with various qualities and structures.Further,the action mechanism of the factors such as coal structure,gas pressure,gas component and so on are discussed.