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首页> 外文期刊>Transport in Porous Media >Effective Stress in Unsaturated Soils: A Thermodynamic Approach Based on the Interfacial Energy and Hydromechanical Coupling
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Effective Stress in Unsaturated Soils: A Thermodynamic Approach Based on the Interfacial Energy and Hydromechanical Coupling

机译:非饱和土壤中的有效应力:基于界面能和流体力学耦合的热力学方法

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摘要

In recent years, the effective stress approach has received much attention in the constitutive modeling of unsaturated soils. In this approach, the effective stress parameter is very important. This parameter needs a correct definition and has to be determined properly. In this paper, a thermodynamic approach is used to develop a physically-based formula for the effective stress tensor in unsaturated soils. This approach accounts for the hydro-mechanical coupling, which is quite important when dealing with hydraulic hysteresis in unsaturated soils. The resulting formula takes into account the role of interfacial energy and the contribution of air-water specific interfacial area to the effective stress tensor. Moreover, a bi-quadratic surface is proposed to represent the contribution of the so-called suction stress in the effective stress tensor. It is shown that the proposed relationship for suction stress is in agreement with available experimental data in the full hydraulic cycle (drying, scanning, and wetting).
机译:近年来,有效应力方法在非饱和土的本构模型中受到了广泛的关注。在这种方法中,有效应力参数非常重要。此参数需要正确的定义,并且必须正确确定。本文采用热力学方法为不饱和土壤中的有效应力张量建立了基于物理的公式。这种方法考虑了水力耦合,这在处理非饱和土壤中的水力滞后时非常重要。所得公式考虑了界面能的作用以及空气-水比界面面积对有效应力张量的贡献。此外,提出了双二次曲面来表示所谓的吸力应力在有效应力张量中的作用。结果表明,拟定的吸力关系与整个水力循环(干燥,扫描和润湿)中的可用实验数据一致。

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