Study on the Critical Value of Gas Content in Regional Prediction of Coal and Gas Outburst Based on Gas Adsorption and Desorption Experiment

Liang Chen; Shaowu Fan; Jianhang Guo; Xiaokai Xu; Lang Zhang

doi:10.18311/jmmf/2017/26973

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Authors

Liang Chen
China University of Mining and Technology Beijing, Beijing 100 083 ,CN
Shaowu Fan
Mine Safety Technology Branch of China Coal Research Institute, Beijing, 100 083 ,CN
Jianhang Guo
Mine Safety Technology Branch of China Coal Research Institute, Beijing, 100 083 ,CN
Xiaokai Xu
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550 081 ,CN
Lang Zhang
Mine Safety Technology Branch of China Coal Research Institute, Beijing, 100 083 ,CN

DOI:

https://doi.org/10.18311/jmmf/2017/26973

Keywords:

Coal and Gas Outburst, Critical Value of Gas Content, Gas Adsorption-desorption Experiment, Basic Gas Parameters, Deformed Coal.

Abstract

Owing to the gas content is an important indicator in coal and gas outburst prevention, we set up a gas adsorption and desorption experimental system with temperature controlling, and draw out a method combining with experimental analysis, theoretical calculation and project inspection to determine the critical value of gas content in coal and gas outburst prediction. This paper takes D6 coal seam in Pingdingshan No.1 coal mine as an example, sets up the powder function equations among the gas content, gas pressure and gas desorption of drill-cuttings (Î”h₂ ). The gas content minimum is calculated as 5.04m³ /t as the gas pressure and Î”h₂ reach their critical values respectively, which is lower than the critical value of gas content (5.19m³ /t) determined by Langmuir formula, considering a deformed coal with a thickness of 0.6m exists in D6 coal seam, the critical value of gas content is determined as 5.0 m³ /t finally, and its accuracy is proved well in engineering application.