正冻土水热迁移的移动泵模型

doi:10.7522/j.issn.1000-0240.2016.0126

冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 1083-1089.doi: 10.7522/j.issn.1000-0240.2016.0126

正冻土水热迁移的移动泵模型

周家作¹, 韦昌富¹, 李东庆², 魏厚振¹

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, 湖北武汉 430071;
2. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃兰州 730000

收稿日期:2016-02-05 修回日期:2016-07-15 出版日期:2016-08-25 发布日期:2016-09-19
作者简介:周家作(1987-),男,四川达州人,助理研究员,2015年在中国科学院武汉岩土力学研究所获博士学位,现从事冻土与天然气水合物方面的研究.E-mail:jiazuoz@gmail.com
基金资助:
国家重点基础研究发展计划（973计划）项目（2012CB026102）；冻土工程国家重点实验室开放基金项目（SKLFSE201502）资助

A moving-pump model for moisture and heat transfer during soil freezing

ZHOU Jiazuo¹, WEI Changfu¹, LI Dongqing², WEI Houzhen¹

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2016-02-05 Revised:2016-07-15 Online:2016-08-25 Published:2016-09-19

摘要/Abstract

摘要： 通过引入脉冲函数将流量边界条件转化为源（汇）项，冻结锋面处的假想泵从未冻土中抽吸水分并储存在冻结锋面附近的狭窄区域.将水分扩散方程在整体求解域上等效分解为两个方程，避免了处理移动冻融边界的难题.在一个分解方程中引入汇项以表达未冻区水分的流出，在另一个分解方程中引入相同大小的源项以表达冻土中水分的聚集.将移动泵模型相关场方程和变量输入COMSOL Multiphysics模拟软件的数学模块中，对一个封闭系统非饱和土冻结过程中水分和温度的变化过程进行了数值模拟，将模拟结果与前人试验和模拟结果进行了对比.

关键词: 冻土, 水热迁移, 数值模拟, 移动泵模型

Abstract: The pulse function was used to transform the flux boundary condition into the source (or sink) term. An imaginary pump located in the freezing front was sucking water from the frozen zone and storing it in a narrow transition zone near the freezing front. The water diffusion equation was divided effectively into two equations in the whole solving domain to avoid the problem of dealing with the moving interface between frozen and unfrozen zone. A sink term was introduced in one dividing equation to express the discharge of water from the unfrozen zone and a source term was introduced in the other dividing equation to express the gathering of water in the frozen zone. The field equations and relations between variables were inputted into the mathematical module of the simulation software COMSOL Multiphysics to model a freezing test of an unsaturated soil sample in closed system, and the simulated results was compared with the experimental and simulated results performed by predecessors.

Key words: frozen soil, moisture and heat transfer, numerical simulation, moving-pump model

中图分类号:

P642.14

周家作, 韦昌富, 李东庆, 魏厚振. 正冻土水热迁移的移动泵模型[J]. 冰川冻土, 2016, 38(4): 1083-1089.

ZHOU Jiazuo, WEI Changfu, LI Dongqing, WEI Houzhen. A moving-pump model for moisture and heat transfer during soil freezing[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2016, 38(4): 1083-1089.

参考文献

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正冻土水热迁移的移动泵模型

A moving-pump model for moisture and heat transfer during soil freezing

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