Based on the new viewpoint of solid and gas interaction mechanics,gas leakage in a duble deformable coal seam can be understood.That is ,under the action of geo
Large cross sectional roadways driven along the previous goaf are always in fragmental surrounding rocks, and remarkably deform under the influence of mining di
The effect of removing pyrite and ash from fine coal with electrostatic separator is determined by the electric property of coal, the distribution of corona ion