Study on Gas Content Critical Value for Regional Prediction in Hebi Area

摘要

Accurately defining gas content critical value of regional prediction is important directive function to improve targeted outburst prevention and reduce the cost. Using Hebi area as case study, the outburst characteristics were analyzed, and the adsorption characteristic of Ⅱ1 seam was studied, lots of gas contents and working face prediction indexes were measured and its relation was studied. The relationship among gas pressure, gas contents and desorption index of drill cuttings was studied in laboratory. The results show that the metamorphism degree of Hebi Ⅱ1 seam is high with strong adsorption ability, and it can adsorb more methane in the same gas pressure condition, eventually determine that the critical value of gas content is 9.0m3/t, which provides technical basis for mine scientific management and improving economic benefit.