Research on Character of Physical Simulation Similar Material of Coal-Rock and Gas Solid-Gas Coupling

Based on the solid simulation material researches, the simulation conditions for methane and coal solid-gas coupling were obtained using solid-fluid coupling theory. Using sand as the aggregate and paraffin and oil as the cementing agent, the material suitable for solid-gas coupling simulation was developed. A permeability testing instrument was also developed and the compressive strength, brittleness parameters and seepage velocity of material with different aggregate were tested. The results showed that with the paraffin content increasing, the material compressive strength increased and permeability decreased. The oil removed the drawback of intensely changing of material compressive strength. Through setting different ratio of aggregate to cementing agent, it can simulate rocks with different strength and permeability. Applying the material to mining simulation experiment, the relationship between methane seepage velocity and overlying strata movement were revealed.