Development of a Multifunctional Triaxial System for Unsaturated Soils: Addition of Permeameter Function

Wang, Hailong; Tian, Jaylord U. Tan; Koseki, Junichi; Sato, Takeshi

doi:10.1520/gtj20190453

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Specifically, on basis of the theory of two stress variables of unsaturated soils proposed by Fredlund and Morgenstern [10], Fredlund [10] and Fredlund and Hasan [11] proposed a systematic consolidation theory of unsaturated soils. Wang et al [12] developed permeameter function for measurement of coefficient of permeability of unsaturated sandy specimens. Zhang et al [13] simulated the moisture migration of unsaturated clay embankments in southern China considering stress state by a numerical method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of One‐Dimensional Consolidation for Unsaturated Soils under Piecewise Cyclic Loading

Huang

Shen

et al. 2021

Advances in Civil Engineering

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This paper studies the one-dimensional (1D) consolidation behavior for unsaturated stratum subjected to piecewise cyclic loading. Combined with the widely accepted consolidation theory of unsaturated soils, a semianalytical method was employed to investigate the consolidation of unsaturated foundation considering piecewise cyclic loading in the Laplace domain. Furthermore, the reduced solutions were produced to perform the verification work accompanied by the results in the existing literature. Finally, a case study was conducted to explore the consolidation characteristics under piecewise cyclic loading (i.e., triangular and trapezoidal cyclic loadings). Parametric studies were carried out by variations of excess pore pressures and settlement against the ratio of air-water permeability coefficients, depth, and loading parameters. The research proposed in this paper can provide theoretical basis for the ground treatment of unsaturated soils, especially for rationally accelerating consolidation or avoiding sudden settlement.

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Section: Introductionmentioning

confidence: 99%

Analysis of One‐Dimensional Consolidation for Unsaturated Soils under Piecewise Cyclic Loading

Huang

Shen

et al. 2021

Advances in Civil Engineering

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Soil Structure in Volcanic Pumice Soil of Dozou-sawa River Evaluated from In Situ and Laboratory Tests

Hashimoto,

Horinouchi,

Sato

et al. 2023

Geotechnical Testing Journal

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Volcanic pumice soils are widely distributed in many countries and sometimes cause severe geo-disasters including large-scale slope failures and long-distance debris flows triggered by seismic ground motion. However, the understanding of the mechanical properties of volcanic pumice soils is still limited because volcanic pumice soils generally have a sensitive structure and are typically distributed in mountain areas that are sometimes difficult to approach. In this study, a portable in situ direct shear test apparatus was developed to evaluate shear strengths of a volcanic pumice soil without disturbing the natural soil structure. A series of in situ direct shear tests was conducted for the volcanic pumice soil in Dozou-sawa river, where a large-scale slope failure followed by debris flow occurred in the 2008 Iwate-Miyagi Nairiku Earthquake. A series of laboratory direct shear tests and triaxial tests were also carried out with intact and reconstituted specimens. The in situ direct shear tests and laboratory direct shear tests using intact specimens showed consistent shear strength. Intact specimens had an extremely loose and sensitive structure because of highly crushable porous particles and a very loose soil skeleton sustained by weak cementation between particles. Such a fragile soil structure could never be reproduced in reconstituted specimens. It was confirmed that the soil structure significantly affected peak shear strengths. For the evaluation of mechanical behavior of such sensitive soils, it is important to use as few disturbed specimens as possible. The newly developed in situ direct shear test apparatus was confirmed to be an effective tool to simply evaluate the shear strength of sensitive volcanic pumice soils on site under low disturbed conditions.

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Effect of moisture change on water retention behavior of unsaturated silty soil under loading- unloading conditions

Shah,

Malik,

Haq

et al. 2024

Preprint

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Earthen embankments either natural or constructed artificially often comprise of unsaturated soils being considered stronger in terms of compressibility and permeability. However, the internal nomenclature of unsaturated soils due to the presence of air, water and soil particles makes it more complex while such soils interact with moisture under the circumstances of applied stress history during the earthen structure’s life span. To investigate this behavior this study is designed to understand the soil water interaction and quantify the retention behavior during loading and unloading conditions. To serve this idea custom designed static compaction tests were carried out under un-drained water and drained air condition at applied stress history. The results show sufficient impact on the soil water retention behavior with the application of loading unloading with varying soil water contents. During the initial stages of the loading process, suction increases with decreasing void ratio due to the heterogeneous distribution of water in the soil at the initial stage. Whereas there is a unique increasing trend in suction at the reloading or wetting phase of the water retention curve at all moisture contents. To examine the impact on void ratio the experimental data has been compared with the selected model incorporating suction, void ratio and degree of saturation for prediction of soil water retention behaviors. The model prediction deviates from the experimental data and shifts away from the model prediction indicating that loading-unloading sequence coupled with the variation in moisture does affect the soil behavior.

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Development of a Multifunctional Triaxial System for Unsaturated Soils: Addition of Permeameter Function

Cited by 3 publications

References 24 publications

Analysis of One‐Dimensional Consolidation for Unsaturated Soils under Piecewise Cyclic Loading

Analysis of One‐Dimensional Consolidation for Unsaturated Soils under Piecewise Cyclic Loading

Soil Structure in Volcanic Pumice Soil of Dozou-sawa River Evaluated from In Situ and Laboratory Tests

Effect of moisture change on water retention behavior of unsaturated silty soil under loading- unloading conditions

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