Influence of different axis-translation techniques using ceramic disks/microporous membrane filters on mechanical/hydraulic behavior of unsaturated soil

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-10-24 DOI:10.1016/j.sandf.2023.101382
Junnan Ma , Xi Xiong , Feng Zhang
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Abstract

Element tests, such as water retention tests and triaxial tests, are efficient and widely used methods for investigating the elementary hydro-mechanical behavior of unsaturated soil. In recent research, discrepancies observed in unsaturated test results using axis-translation techniques (ATTs) with ceramic disks and microporous membrane filters (MM filters) have indicated that misunderstandings might be hiding behind the perceived elementary behavior seen in element tests. In this study, triaxial tests with ceramic disks and MM filters were firstly conducted on specimens of unsaturated completely decomposed granite sand, referred to as Masado in Japan, to compare the influence of different techniques on the test results. Then a soil–water-air coupled finite element-finite difference (FE-FD) method, based on a newly proposed unsaturated/saturated constitutive model coupled with a deformation-dependent water retention curve (WRC), was utilized to simulate triaxial tests as boundary value problems (BVPs) because of the non-uniform deformation of the specimens. Drained/vented triaxial tests showed that the stress–strain relation of Masado is basically the same regardless of the applied technique, while the amount of drainage discharge and degree of saturation during the shearing stage are quite different. The calculated average stress–strain relation basically reproduced a tendency similar to that of the tests. It was also shown from the calculation that the ATT with ceramic disks or MM filters significantly influences the distributions of saturation and stress within the specimens during shearing. It should be emphasized that unsaturated triaxial tests with the ATT are basically BVPs instead of so-called element tests.

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陶瓷盘/微孔膜过滤器不同轴向平移技术对非饱和土力学/水力特性的影响
水保持试验和三轴试验等单元试验是研究非饱和土基本水力学特性的有效且广泛使用的方法。在最近的研究中,使用陶瓷盘和微孔膜过滤器(MM过滤器)的轴平移技术(ats)观察到的不饱和测试结果的差异表明,误解可能隐藏在元素测试中看到的感知基本行为背后。本研究首先对日本Masado非饱和完全分解花岗岩砂试件进行了陶瓷盘和MM滤材的三轴试验,比较了不同技术对试验结果的影响。基于新提出的非饱和/饱和本构模型,结合变形相关的保水曲线(WRC),采用土-水-空气耦合有限元-有限差分(FE-FD)方法,将三轴试验作为边值问题(BVPs)进行模拟。泄放三轴试验表明,无论采用何种技术,Masado的应力-应变关系基本相同,而剪切阶段的泄放量和饱和程度则存在较大差异。计算得到的平均应力-应变关系与试验结果基本一致。计算还表明,在剪切过程中,带有陶瓷片或MM滤片的ATT对试件内的饱和度和应力分布有显著影响。应该强调的是,非饱和三轴试验与ATT基本上是bvp,而不是所谓的元素试验。
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
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
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.
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