Experiment study on mixture ratio of similar material for simulation of coal and gas outburst

In order to conduct a simulation test of coal and gas outburst, cement was selected to be a binder. Broken coal was applied to be the aggregates and wa ter, sands and activated carbon were applied to be the auxiliary material. A mixing ratio plan of the soft coal similar materials with five factors and seven levels was desi gned. A similar material specimen with the diameter of 50 mm was pressed. A similar simulation material preparation method of the coal and gas outburst was studied. The study results showed that the uniaxial compressive strength and the cement quality percentage of the similar material specimen, the cement and sand percentage and similar material density would be in a linear relationship. The similar material prepared could have a good similarity with coal in physics, mechanics property. The pr operties of similar material absorption and desorption CO2 could have a good similarity with coal absorption and desorption CH4. The study results provided important basis to the similar model preparation of the coal and gas outburst simulation test and the fine mixing ratio test of the similar material.