Abstract
Coal and gas outburst similar materials are the basis for coal and gas outburst simulation experiments. The study of similar materials helps to more accurately reduce the phenomenon of coal and gas outburst. By using the pulverized coal, sodium humate and river sand as raw materials, through the orthogonal experimental design, outburst coal similar materials are studied, and the physical mechanics such as the uniaxial compressive strength, elastic modulus and density of similar materials under different mixing ratios are obtained. The results show that under the molding pressure of 20MPa, the uniaxial compressive strength range is 1.335 to 2.527 MPa, the elastic modulus range is 117.45 to 302.00 MPa and the density range of similar materials is 1.308 to 1.438 g/cm3. Sodium humate content and pulverized coal ratio are the main influencing factors controlling the uniaxial compressive strength and elastic modulus of similar materials, while river sand content is the main influencing factor controlling the density of similar materials.
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