Research Of Fully Mechanized Face Spontaneous Combustion Characteristics In The Goaf Based On MATLAB

In recent years, during the process of coal mining, hundreds of billion yuan economic losses owing to spontaneous combustion is caused every year by direct and indirect reasons. With the increase of mining depth, underground pressure phenomenon on the impact of coal mining has become increasingly prominent. Protection coal may be damaged by the underground pressure. Ventilation leakage of goaf and being protected coal seam can be caused by the damaged protection coal. Thus when the spontaneous combustion condition is met, coal's spontaneous combustion will be caused. Mining rate of the fully mechanized face is relatively high. Whereas because of complex and changefully geological conditions of coal mine, when the condition is suitable, spontaneous combustion can also be occurred in the fully mechanized face's goaf. Therefore, under increasing the mining rate and mining velocity, at the same time, research of spontaneous combustion characteristics in the fully mechanized face's goaf should also be studied.In this article, evalution of fully mechanized face based on uncertainty measurement theory is researched in the first time. Uncertainty measurement function of 16 factors that influence the fire risk of fully mechanized face is built by using MATLAB. Uncertainty measurement function picture of various factors is built by using MATLAB's drawing function and uncertainty measurement function. Thereby, influence law of fire risk in the goaf of various factors is visual expressed. In the practice, fire risk grade of Sihe Erhao mine XV1301 face's goaf is calculated by using uncertainty measurement function. The result is beneficial to develop fire prevention and extinguishing in this seam. Fitting of upper corner gas of face is studied in the first time and analysis is studied by combining gas's related coefficient. This method is analyzed by the daily observation datum and does not need to do another experiment. The result is beneficial to develop goaf's ventilation leakage. The method of whole line layout observation points along Sihe Erhao mine XV1301 face is used and datum of O2,CH4,and CO concentration are obtained. Analysis of observation datum is used in the first time by MATLAB's differential function. This method can be used to analyse gas's integral distribution in the goaf. Then, basing on the change of O2 concentration, range of spontaneous combustion"three-zone"in the goaf is obtained. This method is very helpful to mine of complex geological condition. Spontaneous combustion"three-zone"analysis based on MATLAB can be used to analyse sparse data's"three-zone"distribution. This method based on triangle three times equation's interpolation and data trend can be better obtained. At last, basing on range of spontaneous combustion"three-zone"and shortest spontaneous combustion period, least mining velocity of this face is calculated. This can provide guidance function for fire prevention and extinguishing in this face.