基于FLAC^(3D)的含相变三场耦合简化算法  

Practical algorithm of THM coupling process with ice-water phase change based on FLAC^(3D)

作　　者：李国锋[1] 李宁[1,2] 刘乃飞[1] 朱才辉[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《岩石力学与工程学报》2017年第A02期3841-3851,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(11572246;51678484)~~

摘　　要：为了探求简便实用且可服务于实际冻土工程研究的含相变THM(温度场–渗流场–应力场)耦合算法,基于含相变三场耦合能量平衡方程和冻融过程能量阶段假设,提出水–冰相变简化算法;对热–流–力算法进行串并联,得到三场耦合简化算法;并将该简化联合算法应用于FLAC^(3D)对室内岩样冻融试验进行再现,模拟结果与室内试验结果吻合较好,表明该简化算法可行。同时对试验进行扩展,探讨不同因素对温度场和变形场的影响,结果表明:对流换热系数、冻结温度、环境温度越高相变持续时间越短,径向最大冻结应变越大;孔隙率或含水率越大,相变持续时间越长,径向最大冻结应变越大;膨胀系数和冻融循环次数越大,径向最大冻结应变也越大。研究成果对认识岩石冻融环境下温度、变形规律以及相关室内试验设计有一定的参考意义。The water-ice phase change simple algorithm was put forward based on the freeze-thaw energy stage assumption and the energy balance equation considering phase change.The THM（Thermal-Hydraulic-Mechanical）coupling simple algorithm was obtained according to series parallel of T-H-M.The combined simple algorithm was applied to FLAC^（3D） to reproduce indoor freeze-thaw tests and get similar results.And the experiment was extended to investigate sensitivity of various influence factors.As the convection heat transfer coefficient,freezing temperature and boundary temperature are greater,so the time of water-ice phase is shorter and the maximum freezing strain of radial direction is bigger.However,the greater porosity or water content is,the longer time of water-ice phase is.And the greater thermal expansion coefficient and freezing-throwing cycles＇ time are,the bigger maximum freezing strain of radial direction are,etc.The results have some reference significance for understanding temperature and deformation regularity and designing related experiments about rock under freezing-throwing.

关 键 词：岩石力学 水冰相变 三场耦合 冻融循环 

分 类 号：TU45[建筑科学—岩土工程]