A hydraulic conductivity model incorporating adsorption and capillarity for unsaturated/frozen soil

IF 6.9 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Yijie Wang , Yandi Wu , Liming Hu , Pierre-Yves Hicher , Zhen-Yu Yin
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引用次数: 0

Abstract

Hydraulic conductivity is a key parameter for describing seepage-related issues in soils. The soil water retention, soil water freezing, and soil water flow are essentially dominated by adsorption and capillarity. However, these mechanisms have not been effectively incorporated into a unified hydraulic conductivity model. This study proposes a hydraulic conductivity model based on the Navier-Stokes equations and capillary bundle model, which is applicable to both unsaturated and frozen soils. By considering the different influences of adsorption and capillarity on water flow and water freezing, the model can predict the hydraulic conductivities of soils in different states and distinguish the contributions of capillary flow and film flow to the total permeability. Benefiting from the consideration of physical mechanisms, the proposed model can use any of the soil water characteristic curve, the soil freezing characteristic curve, or the particle size distribution as input. The model achieves better prediction accuracy than existing models that do not consider the film flow and its reliability is validated through extensive experimental data including various sands, silts, and lean clays. This study not only provides an effective tool for predicting hydraulic conductivity but also highlights the underlying physical connections between soil water retention, soil water freezing, and seepage.
结合吸附和毛细作用的非饱和/冻土导电性模型
导流系数是描述土壤渗流相关问题的关键参数。土壤水分的保持、冻结和流动基本上是由吸附和毛细作用主导的。然而,这些机制尚未有效地纳入统一的水力导电性模型。基于Navier-Stokes方程和毛细束模型,提出了一种适用于非饱和土和冻土的水力传导性模型。该模型通过考虑吸附和毛细流对水流动和水冻结的不同影响,可以预测不同状态下土壤的水力导率,区分毛细流和膜流对总渗透率的贡献。由于考虑了物理机制,该模型可以使用土壤水分特征曲线、土壤冻结特征曲线或粒径分布中的任意一条作为输入。与不考虑膜流的现有模型相比,该模型具有更好的预测精度,并通过包括各种砂、粉砂和贫粘土在内的大量实验数据验证了其可靠性。该研究不仅提供了预测水力导率的有效工具,而且强调了土壤保水、土壤水冻结和渗透之间潜在的物理联系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Engineering Geology
Engineering Geology 地学-地球科学综合
CiteScore
13.70
自引率
12.20%
发文量
327
审稿时长
5.6 months
期刊介绍: Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.
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