Research On The Math Model Of Coal Mine Safety Simulation System

The coal mine disasters have been continued for many years in China, resulting in heavy losses of people's lives and property, which was in serious discordance with the recently promoted harmonious society. There is an urgent need to establish a more comprehensive and accurate mathematical model to describe the gas system. After the building of the model, it will be possible to simulate the emission law of the coal gas system within a certain period, and give forecast before a risk trend to the relevant working stuff, if so, the "prevention first, safety first" can be accurately implemented.In First, in this paper, the excavation process on the impact of the emission of gas is also analyzed, such as the cannon picking technical and the coal shearing technical; the dynamic model of the coal gas emission from the coal wall and the falling of the coal is also given, and special focus was made on the modeling of the digging working face wind flow and the relationship between coal excavation process and the concentration of coal gas.Second, considering of the accuracy and proper dynamics requirement of the math model, Exponential fitting-Probability prediction model was used for the modeling and prediction of complex gas system, so as to give accurate mathematical basis for the tuning and controlling of the concentration of coal gas in the working face in the process of coal excavation. The prediction is of high accuracy according to the result of the modeling and prediction.At last, for complex and chaotic gas systems, such simplified model has obvious limitations; it is difficult to accurately predict the emission of the coal gas. Then the fractal geometry theory is introduced for the relevant study of the coal mine system, mainly using the theory of R / S analysis method common in the study of fractal geometry; by calculating the Hurst parameter to determine the persistence correlation of the gas system, the current variation trend will remain in a certain period of future time. After calculation, it is found that the period of the persistence correlation lasting an average of 28 days or so, a mutation might occur in the transition time between two periods; therefore, special attention should be paid when a period is near end. It is also calculated that fractal dimension D, which reflects the uneven degree of the time series of the gas. The innovation of this paper is that, proposed probability based on exponential fitting forecast model system to study gas, when doing research on gas sequence, a period T and method to determine it was taken into consideration, thus desirable results were obtained.