Abstract: Abstract. For the limitations of laboratory testing for the permeability of heterogeneous coal seams, an in situ direct testing method for coal seam permeability was proposed. Based on the steady-state gas permeation theory, ...

Abstract: AbstractAs a green building material, recycled aggregate is widely used in the construction market. However, the defects of high water absorption, high pressure crushing value, surface micro cracks, and irregular morphological ...

Abstract: AbstractDuring CH4 extraction of a coal reservoir, the permeability increases due to the stress relaxation of coal matrix shrinkage and gas desorption, which is caused by the damage and destruction of coal. The stress ...