采动应力场-裂隙场演化及其瓦斯涌出特征研究

he author analyzed the relation between mining pressure field-fracture field and gas emission of working face, presented a concept that there is stress point (or strain point) among permeability of coal. The author believes that the mutation of coal permeability caused by the sudden loading or unloading of working face roof as periodic weighting occurs is the main reason that a lot of gas pour into the face. Based on the above concept, the relation was established among abutment pressure during periodic weighting, permeability of coal seam and gas emission, and relation graph was drawn; and then revealed the loading and unloading features of coal at the moment of fracture and non-fracture of main roof; finally presented that the process of sudden loading or unloading as periodic weighting occurs plays an important role in rupture propagation of coal, analytical movement of gas and gas emission.