Study of methane concentration in upper corner based on the least square method

There are many high methane mines in China's coal mines. During the process of mining, overrun of methane concentration in the working face' upper corner is easily caused. When there exists high temperature heat source, accidents of methane combustion and explosion are easily caused by methane overrun. Therefore, it is necessary to monitor and analyze the methane concentration in the upper corner. In this paper, the least square method is used to analyze the methane concentration of a measured working face' upper corner. The methane concentration changing curve is obtained by fitting. The fitting method and fitting effect are analyzed. The results indicate that the fitting based on the least square method is feasible and valid. At last, the correlation between the upper corner methane concentration and the working face methane concentration is analyzed by the related coefficient. The source of methane in the upper corner is analyzed by correlation.