文献类型：期刊文献

中文题名：基于未冻水含量的冻土热参数计算分析

英文题名：Calculation of frozen soil thermal parameters considering unfrozen water content

作者：陈之祥[1,2];李顺群[1,2];夏锦红[3];张勋程[2];桂超[3]

第一作者：陈之祥

通讯作者：Li, SQ[1];Li, SQ[2]

机构：[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;[2]天津市软土特性与工程环境重点实验室;[3]新乡学院土木工程与建筑学院

第一机构：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

通讯机构：[1]corresponding author), Chinese Acad Sci, Indtitute Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;[2]corresponding author), Tianjin Key Lab Soft Soil Characterist & Engn Env, Tianjin 300384, Peoples R China.

年份：2017

卷号：0

期号：S2

起止页码：67-74

中文期刊名：岩土力学

外文期刊名：Rock and Soil Mechanics

收录：CSTPCD;;EI(收录号：20180904849318);Scopus(收录号：2-s2.0-85042539372);WOS:【ESCI(收录号:WOS:000427563400009)】；北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：This work was supported by the Open Research Fund of State Key Laboratory Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics, Chinese Academy of Sciences(z013002) the National Natural Science Foundation of China(41472253), Key Project of Natural Science Foundation of Tianjin City (16JCZDJC39000), and Tianjin Construction System Science and Technology Project Development Plan(2016-25).

语种：中文

中文关键词：冻土;热参数;导热系数;比热;未冻水

外文关键词：frozen soil;thermal parameters;thermal conductivity;specific heat;unfrozen water

摘要：为提升冻土温度场预测精度和减少热参数测试工作量,根据饱和冻土的土、水、冰三相组成,对基于导热系数的冻土未冻水含量反演公式进行了推导。根依据干土和饱和土体的二相构成,推导了适用于土体矿物导热系数预估的计算公式。实测了粉质黏土在不同负温下的比热和导热系数值,分别结合比热确定未冻水含量的递推方法和基于导热系数建立的冻土未冻水含量反演公式,计算得到了粉质黏土在不同负温下的未冻水含量。基于实测和反演获取的未冻水含量,确定了随不同负温变化的冻土导热系数、比热和潜热。将基于冻土未冻水含量确定的热参数代入数值计算软件ABAQUS,获取不同计算热参数下的冻土瞬态温度场计算值。分别将各温度场计算值与模型试验实测值进行了比较,结果表明,从未冻水含量角度出发对冻土温度场计算用热参数的测试工作量进行缩减是可行的;基于Johansen法反演获取未冻水含量,进而确定的热参数能够较好地预测冻土温度场。
In order to improve the prediction accuracy of frozen soil temperature field and reduce the testing work load of thermal parameter, the inversion formula of unfrozen water content is deduced based on the thermal conductivity and the three-phase composition of soil, water and ice in saturated frozen soil. According to the two-phase structure of dry soil or saturated soil, a formula for predicting thermal conductivity of soil minerals is derived. The specific heat and thermal conductivity of silty clay are measured at different negative temperatures; and the unfrozen water contents of silty clay under different negative temperatures are calculated respectively through the recurrence method for unfrozen water content by specific heat and the inversion formula for unfrozen water content by thermal conductivity established in this paper. The thermal conductivity, specific heat and latent heat of frozen soil at different negative temperatures are determined based on the measured and inversed values of unfrozen water content. The thermal parameters calculated by the unfrozen water content are entered into ABAQUS; and the calculated values of frozen soil temperature field with different thermal parameters are obtained. The calculated values of each temperature field are compared with the measured values of the model test. The results show that the reducing testing work load of thermal parameters is feasible from the viewpoint of the unfrozen water content of frozen soil; and the thermal parameters obtained from the inversion of unfrozen water content based on the Johansen method can better predict the frozen soil temperature field.