1 State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, Henan, China 2 School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China 3 State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Group, Pingdingshan 467099, Henan, China
Abstract: Aiming at the problem of high temperature heat damage caused by the surrounding rock of the tunnel in deep-hot mine excavation as one of the main heat sources, the active heat resistance/insulation method that delays or restricts the heat transfer of the high temperature surrounding rock to the mine tunnel is proposed to achieve source control of heat damage research conception. Based on the mine thermal damage and heat and mass transfer theory, combined with the surrounding rock lithology and air flow parameters of the actual tunnel, the calculations proved the theoretical feasibility of using low thermal conductivity thermal insulation materials to achieve active resistance and heat insulation. Using the knowledge of concrete science and colloidal chemistry, the cementitious materials, aggregates, admixtures and admixtures of heat damage isolation materials were selected and self-matched. Based on the orthogonal test, experimental test and efficiency coefficient analysis, the optimal ratio of the comprehensive performance of heat damage isolation material is obtained. That is,the dosage of fly ash is 30% of the cement, the dosage of redispersible latex powder and polypropylene fiber are 0.5% and 0.4% of cementitious material respectively, and the water-cement ratio is 0.6. Through black-red binarization treatment and scanning electron microscope analysis, it was found that the internal micropores of the thermal insulation material with the optimal ratio were dense and evenly distributed, and they were unconnected closed-pore structure, the number of which was much larger than other ratios. The key performance parameters of the new type of mine tunnel thermal insulation material are as follows: dry density is 602.7 kg/m3, compressive strength is 2.58 MPa, thermal conductivity is 0.193 7 W/(m·K), thermal conductivity is only 0.113 3 times of ordinary concrete, which basically meets the thermal insulation requirements of high-temperature surrounding rock in mines, and has a wide range of application values.
贾海林, 项海军, 郭明生, 赵万里, 赵晓举, 张民远, 于水军. 深热井巷热害隔离材料复配体系及性能研究[J]. 材料导报, 2022, 36(20): 21050031-10.
JIA Hailin, XIANG Haijun, GUO Mingsheng, ZHAO Wanli, ZHAO Xiaoju, ZHANG Minyuan, YU Shuijun. Study on Combined System and Performance of the Thermal Insulation Material Applying to High Temperature Strata Tunnel in Deep Coalmine. Materials Reports, 2022, 36(20): 21050031-10.
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2022, Vol. 36 
