Study on the law of initial gas expansion energy and its feasibility in coal and gas outburst prediction

In order to explore the relationship between IEERG and outburst intensity and verify the feasibility of the former in predicting coal and gas outburst, a series tests with different gases and different gas pressures were conducted on the basis of self-developed coal and gas outburst simulation system and IEERG measuring instrument. The results show that with the increase of gas pressure, the IEERG increases gradually. Under the same gas pressure, the coal has the strongest adsorption capacity for CO2, followed by CH4 and N-2. When the IEERG is less than 24.40 mJ center dot g(-1), no outburst will occur. When the IEERG is greater than 24.40 mJ center dot g(-1), weak outburst will occur. When the IEERG is greater than 34.72 mJ center dot g(-1), strong outburst will occur. This shows that the magnitude of IEERG is closely related to the outburst. The larger the IEERG, the greater the possibility of outburst and the greater the intensity of outburst. It is feasible to predict the risk of outburst using IEERG, and it can be quantified.