寒区冻土层含冰孔隙结构导热模型构建及应用分析  

Construction and Application Analysis of Thermal Conduction Model of Ice Containing Pore Structure in Frozen Soil Layer in Cold Regions

作　　者：张田震 王志国[1] 薛孟 董芋双 秦晓凯 韩强 ZHANG Tian-zhen;WANG Zhi-guo;XUE Meng;DONG Yu-shuang;QIN Xiao-kai;HAN Qiang(School of Civil Engineering and Architecture,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学土木建筑工程学院,大庆163318

出　　处：《科学技术与工程》2023年第17期7231-7238,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51706154);黑龙江省科学基金(E2018011);天津市自然科学基金(18JCQNJC77300)。

摘　　要：冻土主要由固、液和气三相物质构成,其中固体可以看成骨架,另外两相物质填充在孔隙中,是典型的多孔介质。寒区冻土层融沉过程中,其中的孔隙结构、矿物颗粒和含冰量等参数变化幅度较大,导热系数等热物性参数随之变化,目前在精细表征和分析研究方面存在一定不足。针对含冰冻土,采用多孔介质描述方法,考虑其相态变化特性,将其分为未冻区、融化区、固结区及已冻区;基于表征单元体(representative elementary volume,REV)方法,结合冻土物理学和传热传质学理论,构建了冻土层导热分析模型,包括微观模型和宏观分析模型;以寒区土壤冻融过程为例进行模拟计算,分析了孔隙率、含水率、含冰率以及通道构成系数等对冻土导热系数的影响规律。所建模型可为寒区冻土传热机理分析及导热特性研究提供理论基础。In the process of thawing settlement of frozen soil layer in cold regions,the phase state and composition structure of frozen and thawed soil change greatly,and the relevant physical parameters also change accordingly.For thermal physical parameters such as thermal conductivity,they are related to mineral particles,ice content,porosity and soil properties.The current analysis model has some deficiencies.The frozen soil was divided into unfrozen area,thawed area,consolidated area and frozen area in consideration of its phase change characteristics.Based on the representative elementary volume(REV)porous medium description method,the thermal conductivity analysis model of ice containing pore structure was established.Finally,the effects of porosity,water content,ice content and channel composition coefficient on the thermal conductivity of frozen soil were analyzed by numerical calculation.The model established can provide a theoretical basis for the analysis of heat transfer mechanism and heat transfer characteristics of frozen soil in cold regions.

关 键 词：冻土融沉 多孔介质 表征单元体 导热分析模型 

分 类 号：P642.14[天文地球—工程地质学]