水利水电技术2017，Vol.48Issue(5)：136-141,6.DOI:10.13928/j.cnki.wrahe.2017.05.021
热参数对冻土温度场的影响及敏感性分析
Analysis on impact and sensitivity of thermal parameter on frozen soil temperature field
摘要
Abstract
In order to evaluate the impact from the value selection of thermal parameter on the temperature field of frozen soil,thermal conductivity,specific heat and latent heat are taken as the factors of the impacts on the temperature field of frozen soil for the experiment design.The thermal conductivity,specific heat and latent heat of the saturated silty clay under different negative temperatures are measured through the relevant lab test,and then an algorithm for modifying the thermal parameters under the consideration of the unfrozen water content of the frozen soil is proposed herein based on Johansen method;from which the calculated values are substituted into the numerical analysis software—ABAQUS with the forms of variable parameter and constant parameter,thus the calculated values of different temperature fields are obtained.Substituting the thermal parameters under different negative temperatures and the average thermal parameters in a negative temperature stage into the numerical analysis software,the impacts from the changes of the thermal parameters on temperature field of the frozen soil are analyzed.In accordance with the relevant freezing test,the measured value of the temperature field in the model box which is frozen for 150h is obtained;furthermore,the calculated value is compared with the measured one.The result shows that the impacts from different thermal parameters are larger in the initial freezing stage and then the differences among all the calculated values are gradually reduced.Taking the average parameters in a certain negative temperature stage as the constant thermal parameters for the numerical calculation,the precision requirements cannot be microscopically met.The latent heat is the main factor to impact freezing temperature field,while the values from the calculation with the consideration of the thermal conductivity,specific heat and latent heat of the soil mass with different negative temperatures are more close to the measured ones.The research results will provide reference for the design and construction of water conservancy projects in cold regions.关键词
冻土/热参数/温度场/数值模拟/未冻水/冻胀/相变/潜热Key words
frozen soil/thermal parameters/temperature field/numerical simulation/unfrozen water/frost-heave/phase transition/latent heat分类
建筑与水利引用本文复制引用
陈之祥,李顺群,王杏杏,夏锦红..热参数对冻土温度场的影响及敏感性分析[J].水利水电技术,2017,48(5):136-141,6.基金项目
国家自然科学基金项目(41472253) （41472253）
天津市自然科学基金重点项目(16JCZDJC39000) （16JCZDJC39000）
天津市建设系统科学技术项目发展计划(2016-25) （2016-25）
