利用多相晶格玻尔兹曼法研究土壤-水特性曲线中的滞后源

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Reihaneh Hosseini, Krishna Kumar, Jean-Yves Delenne
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引用次数: 0

摘要

土壤水特征曲线(SWCC)是非饱和土壤力学中最基本的关系,它将土壤中的水量与相应的母吸力联系起来。根据实验证据可知,SWCC 具有滞后性(即湿润/干燥路径依赖性)。造成 SWCC 滞后的因素有很多,包括空气夹带、接触角滞后、墨水瓶效应以及膨胀和收缩引起的土壤结构变化;但是,这些因素的重要性还存在争议。通过使用多相晶格玻尔兹曼法进行孔隙尺度数值模拟,我们发现,即使控制了所有这些因素,SWCC 滞后现象仍会发生,这表明存在一些未被这些因素考虑在内的潜在来源。我们通过比较二维和三维颗粒填料模拟润湿和干燥实验的液相/气相分布,找到了这种潜在的来源。我们看到,在润湿(即孔隙填充)过程中,许多液桥同时膨胀并连接在一起,从最小的孔隙填充到最大的孔隙,从而使半月板具有更大的曲率半径(更低的母吸力)。而在干燥(即孔隙排空)过程中,只有有限的现有气团可以膨胀,它们受到周围孔隙大小的限制,导致半月板曲率半径较小(母吸力较大)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Investigating the source of hysteresis in the soil–water characteristic curve using the multiphase lattice Boltzmann method

Investigating the source of hysteresis in the soil–water characteristic curve using the multiphase lattice Boltzmann method

Investigating the source of hysteresis in the soil–water characteristic curve using the multiphase lattice Boltzmann method

The soil–water characteristic curve (SWCC) is the most fundamental relationship in unsaturated soil mechanics, relating the amount of water in the soil to the corresponding matric suction. From experimental evidence, it is known that SWCC exhibits hysteresis (i.e., wetting/drying path dependence). Various factors have been proposed as contributors to SWCC hysteresis, including air entrapment, contact angle hysteresis, ink-bottle effect, and change of soil fabric due to swelling and shrinkage; however, the significance of their contribution is debated. From our pore-scale numerical simulations, using the multiphase lattice Boltzmann method, we see that, even when controlling for all these factors, SWCC hysteresis still occurs, indicating that there is some underlying source that is not accounted for in these factors. We find this underlying source by comparing the liquid/gas phase distributions for simulated wetting and drying experiments of 2D and 3D granular packings. We see that during wetting (i.e., pore filling) many liquid bridges expand simultaneously and join together to fill the pores from the smallest to the largest, allowing menisci with larger radii of curvature (lower matric suction). Whereas, during drying (i.e., pore emptying), only the limited existing gas clusters can expand, which become constrained by the size of the pore openings surrounding them and result in menisci with smaller radii of curvature (higher matric suction).

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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