Coupled thermo-hydro-mechanical mechanism in view of the soil particle rearrangement of granular thermodynamics
Coupled thermo-hydro-mechanical mechanism in view of the soil particle rearrangement of granular thermodynamics
复制标题
颗粒热力学视角下土壤颗粒重排的热-水-力耦合机制
DOI：
10.1016/j.compgeo.2021.104272
复制
发表时间：
2021-06-07
影响因子：
5.3
通讯作者：
Yang, Guangchang
中科院分区：
文献类型：
--
作者：
Bai, Bing;Zhou, Rui;Yang, Guangchang
在颗粒热力学框架下，针对饱和/非饱和土的颗粒重排问题，建立了热-水-力耦合机理。该模型避免了流动法则、屈服函数、耗散势函数和硬化准则等概念。通过构造一个考虑结构强度的弹性势能密度函数，考虑了加载路径和土体结构的影响，并引入了退化因子。即应力状态的变化与土颗粒的重排和不同物质相态之间的转换密切相关。推导了适用于热-水-力耦合过程的广义有效应力原理。推导的广义相应力不同于经典的基于线弹性多孔介质的有效原理，能够自动考虑应力路径、温度路径和土体结构的影响。所建立的模型涵盖了土体从非饱和到饱和的全过程，并得到了典型试验结果的验证。
This paper established a coupled thermo-hydro-mechanical mechanism in view of the soil particle rearrangement for saturated/unsaturated soils under the framework of granular thermodynamics. This model avoids concepts such as the flow rule, yield function, dissipation potential function, and hardening criterion. The effects of the loading path and the soil structure are reflected by constructing a density function of elastic potential energy considering the structural strength of a solid skeleton with a degradation factor. That is, the changes in the stress states are closely related to soil particle rearrangement and the transitions between different matter phases. A generalized effective stress principle is derived and is suitable for the coupled thermo-hydro- mechanical process. The deduced generalized phase stresses differ from the classical effective principle based on linear elastic porous media and can automatically consider the impact of the stress path, temperature path and soil structure. The established model spans the complete process from unsaturated to saturated soils and is verified by the typical test results.