无机固化泡沫流固态下防控高温煤岩裂隙机理研究

矿井火灾是煤矿主要灾害之一，其中由于煤岩裂隙漏风导致的煤自燃火灾事故占矿井火灾总数的90%以上。固化泡沫作为矿用防灭火材料发展的一个新方向，亟需开展其流固态下对高温煤岩裂隙渗流封堵、立体覆盖、降温隔热、持续固结等防控作用机理研究。本项目采用化学热动力分析和微观表征研究受热情况下泡沫液膜排液和颗粒骨架水化凝结过程，揭示高温环境对泡沫流体热稳定性影响的内在机制。基于半球面稳态法建立泡沫流体导热模型，运用大涡模拟揭示其在高温煤岩裂隙渗流过程中的降温传热规律。构建并反演水平单裂隙通道内泡沫流体流动数学模型，考虑重力和裂隙内热气流逆向运移阻滞作用，提出纵向倾斜高位裂隙中泡沫流体的时变温变扩散模型。探究其流固态下与煤岩体界面的粘结特性，研究动载荷作用下固化泡沫冲击力学及吸能特性，揭示泡沫固结煤岩裂隙抗矿压扰动持续堵漏风机理。研究成果可为流固态转变的浆泡体系材料高效防治煤自燃火灾提供理论支持和科学依据。

Mine fire is one of the main disasters in coal mine. The coal spontaneous combustion induced by the air leakage form coal and rock fracture accounts for more than 90% of the total mine fire. Solidified foam is a new development direction of mine fire prevention materials. It is urgent to investigate the preventing and controlling mechanism of seepage blocking, three dimensional coverage, cooling and heat insulation and continuous consolidation for the high temperature coal and rock fracture. The project will investigate the two chemical processes include the dynamic drainage of foam liquid film and hydration condensation of grain skeleton by chemical thermodynamic analysis and microscopic characterization. The internal thermal stability mechanism of foam fluid under the high temperature environment will be revealed. The fluid thermal conductivity model will be established by the hemispherical steady state method, based on which, the cooling and heat transfer law in the process of the fracture seepage will be revealed using the large eddy simulation. The flow mathematical model of foam fluid in the horizontal single fracture channel will be established and inversed. Considering the gravity and reverse migration of heat gas flow in the fracture channel, the time and temperature-varying diffusion model of foam fluid in the longitudinal, sloping and high fracture will be proposed. The bonding characteristics of interface of foam with coal and rock in fluid and solidified state will be explored. The impact mechanical and energy absorption characteristics of solidified foam under dynamic loading will be investigated. At last, the mechanism and plugging the air leakage and resistance to the mine pressure disturbance by the consolidation of foam with coal and rock fracture will be indicated. The research results can provide theoretical support and scientific basis for coal spontaneous combustion control by foam materials with transformation from fluid state to solidified state .