Modeling the bimodal SWCC of highly weathered tropical soils using grain-size information

IF 6.9 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Roberto D. Alves , Gilson de F.N. Gitirana Jr , Sai K. Vanapalli
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引用次数: 0

Abstract

The soil-water characteristic curve (SWCC) of highly weathered tropical soils is often bimodal, presenting two main slopes that are strongly related to the macro and micropores. The bimodal SWCC behavior is commonly attributed to fine particle aggregations that affect soil fabric and its pore-size distribution. In this paper, the relationship between basic soil properties (e.g., the Atterberg limits and the grain-size distribution) and the bimodal SWCCs are investigated using a database comprised of 40 different remolded and undisturbed soils. The proposed modeling framework is based on the relationship between the pore-size and the grain-size distributions, using a newly proposed soil property called the β-function. The findings suggest that microporosity has a strong relationship with the liquid limit whereas the total porosity varies mainly as a function of the macrostructure. The grain-size distribution curves under aggregated and disaggregated conditions offer key information on the degree of aggregation and, consequently, on the retention properties of macro and micropores. Several basic soil properties are found to be related to the desaturation zones of the micro and macropores, including the coefficient of uniformity of the fine particle range and the degree of particle aggregation. The developed model offers reasonable estimations for suctions up to approximately 20,000 kPa, with performance exceeding R2 values of 0.80.
利用粒度信息模拟高风化热带土壤的双峰SWCC
热带强风化土壤的土壤-水特征曲线(SWCC)往往是双峰型的,呈现出与宏观和微观孔隙密切相关的两个主坡。双峰SWCC行为通常归因于影响土壤结构及其孔径分布的细颗粒聚集。本文利用一个包含40种不同重塑和原状土壤的数据库,研究了土壤基本性质(如阿特贝格极限和粒度分布)与双峰swcc之间的关系。所提出的建模框架是基于孔隙大小和粒度分布之间的关系,使用一种新提出的称为β-函数的土壤属性。结果表明,微孔隙度与液限关系密切,而总孔隙度的变化主要受宏观结构的影响。聚集和分解条件下的粒度分布曲线提供了聚集程度的关键信息,从而提供了宏观和微观孔隙的保留特性。土壤的一些基本性质与微孔和大孔的脱饱和区有关,包括细颗粒范围的均匀系数和颗粒的聚集程度。所开发的模型提供了高达约20,000 kPa的吸力的合理估计,其性能超过R2值0.80。
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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