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Gas Fractal Seepage Properties Research in Soft-Slicing Coal with Triaxial Pressure System

Pore structure of soft-slicing coal (SSC) is analyzed with physical adsorption method. Several experiment schemes are designed to carry out the tests of gas seepage characteristics of soft-slicing coal at the different confining pressures, gas pressures and axial pressures, with the self-developed gas seepage triaxial pressure experimental system. The typical coal from TianFu coal mine is especially sampled with different designed surface area parameters. The experiment results demonstrate the relations between the seepage velocity, the effective axial feed, and gas pressure. Under the conditions of the constant axial and confining pressure, the seepage velocity increases in an exponent way with gas pressure increasing, the permeability coefficient decreases in negative exponent, and this seepage process shows capacity fractal properties.