Study On Earth Temperature Distribution And Its Abnormal Inducing Factors In Dingji Mine

China is a big country of coal resources, coal occupies the proportion and the important position in the energy structure.But with the deepening of mining depth, the heat harm problems have become increasingly prominent, Seriously affect the safe mining of coal mine and worker’s health.In order to study the distribution law of temperature better and the control factors of geothermal field.This paper selects Anhui Huainan Dingji mine as the research object.We collected rock samples to do experiments,and it is based on approximate steady-state hole temperature, simple temperature hole temperature that has been corrected by approximate steady-state hole temperature,making a systematic analysis of geothermal distribution and controlling factors of geothermal field in the whole mining area.1.From the analysis results of the heat flow value, Dingji’s heat flow value71.496mV/m2is greater than the Anhui province average heat flow value of68.66mW/m2.2.From the vertical variation characteristics of Dingji mine geothermal gradient analysis.The increase of Dingji mining area ground temperature of temperature with depth increased, showing good linear correlation, fitting degree is as high as98%, with increasing temperature characteristics of conduction type.3.By analyzing the temperature hole’s data in Dingji mine, come to the conclusions that drilling depth temperature ranged from716to1045meters,bottomhole temperature ranged from37.52to52.47Celsius, geothermal gradient ranged from2.33to2.33Celsius ever one hundred meters,the region’s average geothermal gradient is3.31Celsius ever one hundred meters, positive anomalies, warming rate of30.2meters ever Celsius.4.Through the analysis of the characteristics of geothermal gradient change of coal bearing strata, that with increasing the depth of coal seam, the seam’s average geothermal gradient show a growing trend.5.Through the analysis of Dingji mine heat harm depth,we divided into one or two class heat harm region, and draws the Panji anticline from north to south,the depth of thermal damage temperature contours more deep.The depth of north mine field difference is bigger, more gentle southern change. 6.Through the GMS software, establish the mine three-dimensional temperature field simulation. Study on temperature changes of them through analyse the main coal isothermal diagram, each section line temperature stereogram and the same depth temperature distribution.According to the Isothermal diagram of each main mining coal seam can be obtained that in the same coal seam in Dingji mine, the south of the coal temperature is higher than north, in the shallow coal seam in Panji anticline temperature higher than the temperature in deep coal seam obviously.The temperature stereogram of each section line and geothermal distribution map of the same depth can be obtained on the geothermal anomaly zone affected more significantly in Panji anticline.7.Combining with the lithology combination,geological structural configuration, radioactive content in rock,magmatite activities, groundwater activity and other aspects in Dingji Coal Mine, to explore the factors cause temperature changes and the influence on the field, has the certain instruction function to guide the mining.