A new experimental setup for the determination of drying soil–water characteristic curve and coefficient of permeability using the continuous evaporation method and osmotic tensiometers

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2024-05-08 DOI:10.1016/j.sandf.2024.101470

Yan Zhao , Harianto Rahardjo , Hengshuo Liu

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引用次数: 0

Abstract

Soil-water characteristic curve (SWCC) and coefficient of permeability (k) are amongst the most crucial soil properties in unsaturated soil mechanics for soil moisture conservation. The direct measurement and prediction of such properties are important to engineering applications, but they are complicated. This study developed a new experimental setup (the OT permeameter) using osmotic tensiometers (OTs) and the continuous evaporation method. The proposed OT permeameter could directly measure SWCC and k up to 1000 kPa suction within one to two weeks. Moreover, the proposed setup is fully automated and data processing was minimal. In addition, a new general equation has been developed to predict and best fit the unsaturated k measurement. The proposed equation uses a minimal number of parameters that carry physical meaning and provides an intuitive and easy way to predict and best-fit k measurement. The accuracy and robustness of both the proposed OT permeameter and prediction equation were evaluated using published data and experimental data from this study.

查看原文本刊更多论文

利用连续蒸发法和渗透张力计测定干燥土壤水特性曲线和渗透系数的新实验装置

土壤水特征曲线（SWCC）和渗透系数（k）是非饱和土壤力学中对土壤水分保持最关键的土壤性质之一。直接测量和预测这些特性对工程应用非常重要，但却非常复杂。本研究利用渗透张力计（OT）和连续蒸发法开发了一种新的实验装置（OT 渗透仪）。拟议的 OT 渗透仪可在一至两周内直接测量高达 1000 kPa 吸力的 SWCC 和 k。此外，所提议的装置是全自动的，数据处理量极小。此外，还开发了一个新的通用方程，用于预测和最佳拟合非饱和 k 测量值。所提出的方程只使用了极少量具有物理意义的参数，为预测和最佳拟合 k 测量提供了一种直观、简便的方法。利用已公布的数据和本研究的实验数据，对所提出的加时赛渗透仪和预测方程的准确性和稳健性进行了评估。

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

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.