Jia Hailin, Zou Qian, Cui Bo, Zeng Jinxiang
Collaborative Innovation Center of Coal Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
ACS Omega. 2023 Dec 8;8(50):48091-48103. doi: 10.1021/acsomega.3c06929. eCollection 2023 Dec 19.
To address, mitigate, or prevent thermal environmental issues arising from the heat dissipation of high-temperature surrounding rocks in deep hot tunnels, a research proposal is put forward based on previous studies and the team's initial experiments. The proposal involves using mechanical and chemical foaming to enhance the thermal insulation properties of foamed concrete, and this will be tested through engineering verification. Different proportions of cementitious materials, latex powder, polypropylene fiber, and self-made composite foam materials were designed using an orthogonal approach for testing the macroperformance and microstructure of foamed concrete. The pore structure of foamed concrete was quantitatively analyzed by Image-Pro Plus 6.0 software, and a fitting expression was established between thermal conductivity and the number of pores (1-2 mm). Characteristics of heat transfer inside the foam concrete were simulated and analyzed using COMSOL software, and the transmission path of heat streamline was found to be ″concave-convex form″, illustrating the blocking effect of foam concrete on heat. A thermal insulation engineering model was created using Fluent software to investigate the effects of thermal insulation layer thickness, water gushing heat release, seasonal factors, and other working conditions on the airflow temperature in the roadway before and after the application of foam concrete. The simulation results demonstrate that foam concrete can effectively reduce the airflow temperature in the roadway and weaken the surrounding rock heat dissipation. Additionally, it is found that the decreasing rate of heat dissipation of surrounding rock increases with the increase of insulation layer thickness, proving the engineering applicability of foam concrete for roadway insulation. The research results provide a theoretical basis and practical guidance for heat damage control of deep mining roadway.
为解决、减轻或防止深部热害巷道高温围岩散热引起的热环境问题，在以往研究和团队初步试验的基础上，提出了一项研究方案。该方案包括采用机械发泡和化学发泡来提高泡沫混凝土的保温性能，并将通过工程验证进行测试。采用正交试验方法设计了不同比例的胶凝材料、乳胶粉、聚丙烯纤维和自制复合泡沫材料，以测试泡沫混凝土的宏观性能和微观结构。利用Image-Pro Plus 6.0软件对泡沫混凝土的孔隙结构进行了定量分析，并建立了导热系数与孔隙数量（1-2mm）之间的拟合表达式。利用COMSOL软件对泡沫混凝土内部的传热特性进行了模拟分析，发现热流线的传递路径为“凹凸形”，说明了泡沫混凝土对热的阻隔作用。利用Fluent软件建立了保温工程模型，研究了保温层厚度、涌水放热、季节因素等工况对泡沫混凝土应用前后巷道风流温度的影响。模拟结果表明，泡沫混凝土能有效降低巷道风流温度，减弱围岩散热。此外，还发现围岩散热降低率随保温层厚度的增加而增大，证明了泡沫混凝土用于巷道保温的工程适用性。研究结果为深部开采巷道热害控制提供了理论依据和实践指导。
