Modelling water retention and volume change behaviours of unsaturated soils in non-isothermal conditions
Modelling water retention and volume change behaviours of unsaturated soils in non-isothermal conditions
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DOI：
10.1016/j.compgeo.2013.07.011
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发表时间：
2014
影响因子：
5.3
通讯作者：
Annan Zhou;D. Sheng;Jie Li
中科院分区：
文献类型：
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作者：
Annan Zhou;D. Sheng;Jie Li
本文提出了一种简单的方法来模拟温度对变形土的土壤-水保持曲线的影响，并考虑了以下两个方面：(1)温度对液-气界面张力的影响；(2)温度引起的土骨架变形。第一个方面，温度效应，可以用Grant和Salehzadeh提出的方程[18]来模拟，但第二个方面在文献中通常被忽略了。为了量化非饱和土热-水-力(THM)变形(即上述第二个方面)，在原有SFG框架的基础上提出了一个简单的体积变化方程，称为非等温SFG体积方程[37]。本文给出了一种在净平均应力、吸力和温度空间中的三维THM屈服面。提出的体积变化方程通过一个简单的流体-机械耦合定律被整合到非等温SWRC中[38]。通过几个数值算例研究了非等温SFG体积方程和非等温SWRC方程的性能。利用文献报道的大量实验结果验证了所提出的非等温SFG体积变化方程和非等温SWRC方程的正确性。
This study presents a simple approach to modelling the effect of temperature on the soil–water retention curves (SWRCs) of deformable soils and takes into consideration the following two aspects: (1) the effect of temperature on the liquid–gas interfacial tension and (2) temperature-induced deformation of the soil skeleton. The first aspect, the temperature effect, can be modelled using an equation proposed by Grant and Salehzadeh [18], but the second aspect is generally neglected in the literature. To quantify the thermo-hydro-mechanical (THM) deformation of unsaturated soils (i.e., the second aspect mentioned above), a simple volume change equation, referred to as the non-isothermal SFG volumetric equation, is proposed on the basis of the original SFG framework [37]. A three-dimensional THM yield surface in the space of net mean stress, suction and temperature is presented here. The proposed volume change equation is integrated into the non-isothermal SWRC by means of a simple hydro-mechanical coupling law [38]. The performance of the non-isothermal SFG volumetric equation and the non-isothermal SWRC equation is investigated through several numerical examples. A number of experimental results reported in the literature are employed to confirm the validity of the proposed non-isothermal SFG volume change equation and the non-isothermal SWRC equation.