Research on Seepage Characteristics and Pore Structure of Roof and Floor of Pressurized Rich Water Coal Seams
During the construction and mining process of Dengjiazhuang coal mine in Shanxi,a special hydrogeological phenomenon of coal seams as confined fracture aquifers was discovered.In order to further explore the key role of permeability mechanical properties in confined fractured aquifers,rock samples from the top and bottom layers were taken for complete stress-strain permeability tests and pore development structure tests.The results show that the coal seam in the coal mine is a pressurized fractured aquifer,and the pressurized water in the coal seam fractures is closely related to the total stress-strain permeability and pore structure development characteristics of the roof and floor.The closer to the coal seam,the stronger the water tightness and plasticity of the formation,and the stronger the resistance to failure of the formation during deformation,resulting in greater strain in the formation of macroscopic water conducting fractures.For undeveloped fractures,the effective porosity of the top and bottom strata within 30 meters of the coal seam is less than 2%,especially the effective porosity of the strata within 20 meters of the coal seam is less than 1%,indicating that the strata have good water resistance.
fractured confined waterpore structurerich water coal seam
万方数据
维普
