中文摘要：

研究低温及冻融循环条件下岩体热、水、力特性对于寒区工程冻胀机理研究及防寒保温设计具有十分重要的指导意义。综述国内外低温及冻融循环条件下岩石的物理力学特性,温度,渗流特性以及水、热、力耦合特性4个方面的研究现状以及取得的研究成果,并结合寒区隧道的特点,提出以现场监测、大量室内冻融试验和单轴、三轴压缩试验为手段,以研究低温相变条件下的导热系数等热、水、力学参数为基础,以建立含相变低温岩体水热耦合模型和考虑空气温度和湿度影响的隧道风流场湍流模型为前提,以获得通风条件下寒区隧道温度–渗流–应力–损伤耦合模型为目的,用以研究寒区隧道围岩的冻胀破坏机制;同时,开发出兼具轻质、保温、抗冻、抗裂和抗震等功能的泡沫混凝土,用于寒区工程保温层及抗震层使用的基本思路。

英文摘要：

It is of significance to research the thermo-hydro-mechanical characteristics of rock mass under the condition of low temperature and freeze-thaw cycles for engineering construction in cold regions.The four aspects：physico-mechanical properties of rock,temperatures,seepage characteristics and thermo-hydro-mechanical coupling characteristics under the condition of low temperature and freeze-thaw cycles were reviewed;and combining with the characteristics of tunnel in cold regions,a new idea to research the frost heave of surrounding rock and its insulation measure were put forward;firstly,based on field monitoring,a large number of freeze-thaw tests,uniaxial compression tests and triaxial compression tests,the thermo-hydro-mechanical parameters,such as coefficient of thermal conductivity should be obtained exactly;and then a proper coupled thermo-hydraulic model for low temperature rock including phase change should be established;after this,a damage factor is proposed to consider the freeze-thaw effect in rock and the thermo-hydro-mechano-damage coupled model considering the effect of volumetric strain on temperature and seepage field of surrounding rock and the effect of temperature gradient,seepage pressure and frost heave pressure on mechanical field for tunnel in cold region can be established to study the frost heave of surrounding rock;meanwhile,a high-performance foamed concrete is designed as an insulation material used in tunnel,which has the characteristics of lightweight,insulation,cold-proof,crack resistance and aseismic.