岩土介质在冻融过程中的温度场研究及工程应用  

STUDY OF TEMPERATURE FIELD IN PROCESS OF FREEZING-THAWING IN GEOTECHNICAL MEDIUM AND ITS APPLICATION

作　　者：谭贤君[1] 余祥宏[2] 陈卫忠[1,3] 伍国军[1] 于洪丹[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中交第二公路勘察设计研究院有限公司,湖北武汉430056 [3]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《岩石力学与工程学报》2012年第A01期2867-2874,共8页Chinese Journal of Rock Mechanics and Engineering

摘　　要：基于"三区域"(已冻区、正冻区和未冻区)理论,建立岩土介质在冻融过程中的温度场数学模型,并将利用有限元数值计算方法得到的结果与V.J.Lunardini等得到的经典解析解结果进行对比,验证该数学模型的正确性和可靠性。在此基础上,探讨岩土介质在冻融过程中相变潜热和正冻区的大小对温度场分布的影响,并对西藏嘎隆拉隧道围岩温度场以及保温层保温效果进行数值仿真分析。研究结果表明:采用二衬表面附设保温材料方法对隧道衬砌及围岩温度影响效果明显,在二衬表面施作6 cm厚的福利凯保温层后,衬砌和围岩不会承受冻融破坏。该研究成果对于寒区隧道冻融圈大小的确定及防寒保温措施的选用具有重要的理论和现实意义。Basing on the ＂three-zone＂ （frozen zone, freezing zone and unfrozen zone） theory, a mathematical model considering the process of freezing-thawing is presented to calculate the temperature field in geotechnical media, the model is verified by correctly simulating the V. J. Lunardini analytical solution for ice formation in a porous medium. Based on this, the influence of heat latent and range of freezing zone on the distribution of temperature in the process of freezing-thawing is studied, and a numerical simulation about a tunnel in Tibet is done to discusses the effect of insulation material. From the numerical results, it is found that the temperature of lining and surrounding rock are greatly changed by building insulation material at the surface of tunnel lining, after constructing a 6 cm thickness poly phenolic insulation, the lining and surrounding rock will not be affected by freezing-thawing damage. The results can give some references for design and construction of tunnel in cold regions.

关 键 词：土力学 寒区隧道 冻融 相变 温度场 

分 类 号：TU43[建筑科学—岩土工程]