Research on law and countermeasures of gas over-limit accident in Yuwu Coal Mine based on mathematical statistics

Gas over-limit is the cause of gas explosion accident. In order to analyze the regularity of gas over-limit accidents, based on the gas over-limit accidents from January 2018 to August 2019 in Yuwu Coal Mine, by using mathematical statistics, we study the frequency, location and duration of early warning of accidents, and the results show that the highest accident rate is in the 01:00-02:00 and 06:00-07:00 time periods, and the overall accident rate is still within the controllable range, and 88% of the accidents occurred in the driving surface; most of the accidents have the characteristics of short duration and low concentration; the accidents are mainly concentrated in the air cylinder replacement operation, coal cutting operation, and drilling operation.