Development and application of coal and gas outburst test system based on gas driven

In order to further study the influence laws and the development mechanism of catastrophe due to gas driven on coal and gas outburst in structural belt, a gas driven multi-physics coal and gas outburst test system was developed.The main functions of the system consist of loading system, triaxial pressure chamber, rapid pressure relief system, temperature control system, data acquisition system, acoustic emission monitoring system and auxiliary system.The main functions of the system are as follows:① Test of coal and gas outburst on standard briquette and raw coal samples at different temperatures and gas pressures.② The outburst test of coal samples of different sizes can be carried out, and the system can use different sizes of the outburst cavern to control the outburst strength.③ The acoustic emission probe installed in the indenter of triaxial chamber integrates the probe with the test system.④ The whole outburst process can be observed through the transparent structure of the first level pressure chamber.⑤ The test system contains multi-stage pressure chambers which can change the gas pressure outside the outburst cavern and induce a delayed outburst.The test results show that gas pressure has obvious pulverization effect on coal samples, and the outburst phenomenon of raw coal samples is closer to the actual situation of the field.After the outburst, not only the pulverized coal is present, but also there are a large number of large particles of pulverized coal and small coal blocks, which indicates the phenomenon of blocking the outburst cavern and inhibiting the outburst.