[1]魏道凯,荆皓,陈琦,等.寒区土体一维水-热-力耦合模型与数值分析[J].自然灾害学报,2022,31(05):150-157.[doi:10.13577/j.jnd.2022.0517]
 WEI Daokai,JING Hao,CHEN Qi,et al.One-dimensional hydro-thermal-mechanical coupling model and numerical analysis of soils in cold region[J].,2022,31(05):150-157.[doi:10.13577/j.jnd.2022.0517]
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寒区土体一维水-热-力耦合模型与数值分析
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
31
期数:
2022年05期
页码:
150-157
栏目:
出版日期:
2022-10-28

文章信息/Info

Title:
One-dimensional hydro-thermal-mechanical coupling model and numerical analysis of soils in cold region
作者:
魏道凯1 荆皓2 陈琦2 寇海磊2
1. 山东交通职业学院 公路与建筑系, 山东 潍坊 261206;
2. 中国海洋大学 工程学院, 山东 青岛 266100
Author(s):
WEI Daokai1 JING Hao2 CHEN Qi2 KOU Hailei2
1. Department of Highway and Architecture, Shandong Transport Vocational College, Weifang 261206, China;
2. College of Engineering, Ocean University of China, Qingdao 266100, China
关键词:
冻融灾害水热力三场耦合一维土柱温度场水分场冻结锋面冻胀变形
Keywords:
freezing and thawing disastershydro-thermal-mechanical couplingone-dimensional soil columntemperature fieldwater fieldfrozen frontfrost heave deformation
分类号:
TU445;P642.14;X43
DOI:
10.13577/j.jnd.2022.0517
摘要:
寒区土体的冻胀融沉特性对结构物稳定带来极大挑战,冻土冻融作用机理的研究对寒区冻融灾害预防具有极其重大的意义。文中通过质量守恒定律以及能量守恒定律建立寒区一维土柱水分场、温度场数值模型,考虑冰水相变引起土体内部应力变化以建立应力场。构建一维非饱和土柱水热力耦合模型,通过与已有研究比对以验证三场耦合数值模型的准确性。研究表明:冻结锋面随冻结时间不断下移。在冻结初期,冻结锋面下移速度较快,在冻结后期冻结速度变缓,且土柱内温度成近似线性分布趋势。土柱内水分场在冻结锋面处出现明显的S形曲线。在冻结条件下,土柱发生竖向的冻胀变形,模拟结果与已有试验数据吻合良好,验证了该模型的合理性以及准确性。
Abstract:
The freeze-swelling and thawing characteristics of cold zone soils pose great challenges to the stability of structures,while the research on the mechanism of freeze-thawing action of frozen soils is of great significance to the prevention of freeze-thawing disasters in cold zones. In this paper,the numerical models of moisture and temperature fields of one-dimensional soil columns in cold zones are established by the law of conservation of mass andthelawofconservationofenergy,andtheinternalstresschangesofsoilcausedbythephasechangeoficeand water are considered to establish the stress field. The one-dimensional unsaturated soil column hydro-thermal-mechanical coupling model is constructed and compared with existing studies to verify the accuracy of the three-field coupling numerical model. The research reflects that the freezing front moves downward continuously with the freezing time. In the early stage of freezing,the freezing front moves downward faster. In the late stage,the freezing speed becomes slower and the temperature inside the soil column has an approximately linear distribution trend. The moisture field in the soil column shows an obvious S-shaped curve at the freezing front. Under the freezing condition, the soil column undergoes vertical freezing deformation,while the simulation results are in good agreement with the available experimental data,which verifies the reasonableness and accuracy of the model.

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备注/Memo

备注/Memo:
收稿日期:2021-5-6;改回日期:2021-10-7。
基金项目:西藏自治区重点研发计划(XZ202001ZY0013G)
作者简介:魏道凯(1970-),男,教授,工程硕士,主要从事公路铁路路基,冻土研究.E-mail:2359608743@qq.com
通讯作者:魏道凯(1970-),男,教授,工程硕士,主要从事公路铁路路基,冻土研究.E-mail:2359608743@qq.com
更新日期/Last Update: 1900-01-01