| As Chinese mines gradually enter deep mining,the heat damage problem becomes more and more serious.The high underground temperature puts the workers’ life and health at great risk,resulting in lower work efficiency and reduced mine output,and the management of mine heat damage is a must for safe and efficient production in deep mines.The research work on mine ground temperature and cooling measures at home and abroad is very extensive,but there is no in-depth research on the formation mechanism of heat damage in working face and two lanes,as well as the distribution of heat sources and heat dissipation.In this thesis,we conducted on-site observation on the 24090 working face of the No.10 Mine of Ping Mei Shen Ma Group,which is a deep mine with serious heat damage.The collected data were used to calculate the heat dissipation of underground heat sources and construct the underground heat source distribution model.By comparing the research results of field measurements,theoretical calculations and numerical simulations,the contribution of each heat source to heat damage was derived and a standard heat source analysis model was established,and two heat damage prevention and control techniques were proposed,and the effect of each technique on the wind flow temperature field was studied and analyzed.The main research results are as follows:(1)Periodic measurements of the climatic conditions at the working face of 24090 were carried out,and ground temperature monitoring instruments were installed and periodically observed and recorded.The wind flow parameters of the working face and the two lanes as well as the raw rock temperature of the lane were obtained.For example,the average dry bulb temperature of the machine lane was 27.14℃,the wet bulb temperature was 23.57℃,the wind speed was 2.29 m/s,the relative humidity was 77.82%and the raw rock temperature of the lane was 44.9℃;(2)Using the data obtained from experiments and field measurements to calculate and analyze the main heat sources in the working face.The working face was divided into five parts through the distribution of heat sources,and the dry bulb temperature contributed by each part to the increase of the tunnel wind flow temperature was calculated and compared with the field measured temperature for detailed analysis.The error between the two was calculated,and the temperature of the extraction zone was2.81℃ from the analysis.The percentage of personnel heat dissipation in the contribution of heat damage was derived 0.3%,oxidation heat dissipation accounted for 16.5%,gangue transport heat dissipation accounted for 16.8%,heat dissipation in the quarry area accounted for 17.6%,mechanical equipment heat dissipation accounted for 20.6%,and heat dissipation in the surrounding rock accounted for 28.2%;(3)Using COMSOL numerical simulation software to establish the heat source heat dissipation analysis model of 24090 working face and two lanes.The obtained air flow temperature change curve in the lane,analyze the law of air flow change,the error between the data obtained from the model and the field data is 3.55%,determine the feasibility of the model and the accuracy of the data;(4)Two heat damage prevention technologies were proposed,their prevention mechanisms were analyzed,and the technologies were implemented in the heat source analysis model,and the cooling process of "cold water down the shaft" cooled the working face by 4.56℃,and the heat insulation process of "composite heat barrier ring" cooled the working face by 5.27℃.There are 44 figures,21 tables and 93 references in this thesis. |
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