| Coal fire areas occur in underground is very common in our county.Before the fire area governance,it has to locate the position of the fire source and the boundary of fire area.Geophysical prospecting method is a very promising method in fire detection,but each method has its disadvantages,the result of single geophysical method that used to measure the coal mine fire source and the boundary of coal mine fire area is not satisfied.Analysis of various geophysical methods that:radon detection method and the magnetic joint fire district has certain advantages,which can be spread.The article had analyzed the coal fire burning effects on radon concentration and Radon migration.The geological model of radon is built to analyzing the characteristic of the buring surface of radon value.Fractal method is used to determine the lower limit measuring radon anomalies in the area,which then is important to the scope of the radon anomalies.Results of the radon detection shows that the coal fire based on factors such as temperature,pressure,radon migration channel and the effect of promoting of radon exhalation and migration,formation of radon anomalies in the surface.Through the analysis of different coal fire burning phase in rocks,the influence of magnetic modeling combined with the fire area,expounds the surface magnetic field distribution.Through the inversion of magnetic data,determine the scope area of strong magnetic burning rocks.Magnetic detection results show that the warming in coal combustion to the Curie point,burning rocks magnetic weakened and even disappeared;Coal fire temperature declines,burning rocks get magnetic formed strong TRM.Through the analysis of radon anomaly area and the strong magnetic variable spatial relation of the rock mass burning,the fire area is divided into normal region,warming burns out area,cool the burn area and coal fire area,and predict the development of the fire area and the development direction. |
PDF Full Text Request