饱和土在单向冻结过程中的水-热-力耦合分析

罗会武; 刘恩龙

doi:10.13409/j.cnki.jdpme.2017.04.012

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饱和土在单向冻结过程中的水-热-力耦合分析

HM耦合作用下岩土体力学特性 | 更新时间：2025-12-11

- 饱和土在单向冻结过程中的水-热-力耦合分析
- Hydro-thermo-mechanical Coupling Analysis of Saturated Soils during the Process of Freezing in Uni-direction
- 防灾减灾工程学报 2017年37卷第4期页码：586-592
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  中国科学院率先行动百人计划择优支持项目资助
- DOI：10.13409/j.cnki.jdpme.2017.04.012
  中图分类号： U445
- 纸质出版：2017
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[1]罗会武,刘恩龙.饱和土在单向冻结过程中的水-热-力耦合分析[J].防灾减灾工程学报,2017,37(04):586-592.

罗会武, 刘恩龙. Hydro-thermo-mechanical Coupling Analysis of Saturated Soils during the Process of Freezing in Uni-direction[J]. 2017, 37(4): 586-592.
[1]罗会武,刘恩龙.饱和土在单向冻结过程中的水-热-力耦合分析[J].防灾减灾工程学报,2017,37(04):586-592. DOI： 10.13409/j.cnki.jdpme.2017.04.012.

罗会武, 刘恩龙. Hydro-thermo-mechanical Coupling Analysis of Saturated Soils during the Process of Freezing in Uni-direction[J]. 2017, 37(4): 586-592. DOI： 10.13409/j.cnki.jdpme.2017.04.012.

摘要

给出了一多物理场模型来模拟饱和正冻土的水-热-力耦合过程。冻土区采用的是非线性弹性本构模型

而未冻区采用修正的剑桥模型。在这一数学模型中

克拉伯龙方程用于描述水和冰在相变时满足的平衡条件

并通过修正孔隙比来描述与温度有关的传导系数

由此描述未冻水的迁移。假定单元中土颗粒的长度不变且沿土柱冰晶从低温向高温有序生成

由此考虑水相变成冰的相对体积变化。以土颗粒的长度为分析目标来考虑冻胀过程中的较大变形。对于给定的边界条件

采用COMSOL软件对耦合的非线性偏微分方程进行求解。结果表明

这一方模型可以较好的模拟饱和土在冻结过程中的水-热-力耦合特征。

Abstract

A multiphysical field model is presented to simulate the coupled hydro-thermo-mechanical processes in freezing saturated soils. The nonlinear elastic theory is applied in frozen soils to describe the relationship of stress and strain and the modified Cam model is used in unfrozen soils. In the mathematical model

the Clapeyron equation is employed as the phase equilibrium condition of water and ice in soil. The hydraulic conductivity

which is a function of temperature

is adjusted by void ratio to describe the unfrozen water migration. Here the length of soil grains in the element are assumed to be constant and the ice grain is formed in order from lower temperature to higher. So the relative c

hange of volume is taken into account when water turns into ice.The soil grain length dx

is regarded as analysis object which is suited to describe the large deformation. The coupled nonlinear partial differential equation system is solved under typical boundary condition with the assistance of COMSOL software. The simulation results indicate that the model properly captures the coupling characteristics of hydro-thermo-mechanical process in saturated freezing soil.

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references

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