Hydro-mechanical behavior of expansive soils with different dry densities over a wide suction range

Zhang, Junran; Niu, Geng; Li, Xuchang; Li, Jingpei

doi:10.1007/s11440-019-00874-y

Cited by 60 publications

(23 citation statements)

References 40 publications

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“…Lime is a prevalent and effective additive that has been widely used for soil stabilization. Previous studies showed that lime addition can increase the optimum water contents, shrinkage limits, and strengths of the mixtures but decrease the liquid limits, plasticity indexes, and maximum dry densities of the mixtures [6][7][8][9][10][11][12][13]. However, in engineering practice, there are lots of environmental conditions which can affect the effect of chemical stabilization of soil foundations.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Lime‐Stabilized Red Bed Soil after Cyclic Wetting‐Drying in Triaxial Tests and SEM Analysis

Song

Zhang²,

Mao

et al. 2020

Advances in Materials Science and Engineering

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Most red beds demonstrate inferior geotechnical properties in natural conditions and need to be improved when used as construction material. In this study, a serious of triaxial tests, permeability tests, and scanning electron microscopy (SEM) analysis were carried out on lime-stabilized and untreated red bed soil after experiencing different wetting-drying (W-D) cycles. e test results showed that, with the increase in the added lime, the shear strength, strength parameters (including the cohesion and the internal friction angle), and the shear modulus of red bed soil increased gradually. For the untreated specimens, the four parameters decreased considerably after experiencing W-D cycles, while for the lime-stabilized specimens, they generally increased with an increase in the W-D cycles. Without experiencing the W-D cycles, the permeability coefficient increased by two times after it was stabilized with 10% lime. But with an increase in the W-D cycles, the permeability coefficient of the untreated and lime-stabilized specimens continuously increased and significantly decreased, respectively. Finally, variations in microstructure of the red bed soil under the effects of the lime stabilization and W-D cycles were discussed based on the SEM analysis. e results may contribute to improvement of red bed soil when used as roadbed and airfield fillings.

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Section: Introductionmentioning

confidence: 99%

Behavior of Lime‐Stabilized Red Bed Soil after Cyclic Wetting‐Drying in Triaxial Tests and SEM Analysis

Song

Zhang²,

Mao

et al. 2020

Advances in Materials Science and Engineering

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“…In addition, the modulus of soils with high suction are normally very large and the changes of void during shear tests are thus small. Thereby, shear tests under constant water content are often considered as under constant suction in high suction range (Gao et al, 2019;Zhang et al, 2020). Substitution of qf, ̅ , + + and s (see Tables 1, 2 and 3) into Eq.…”

Section: Evaluation Of the Proposed Methods Through Shearmentioning

confidence: 99%

Determining Bishop's parameter χ based on pore size distribution

Niu

Cui

Pereira

et al. 2021

Géotechnique Letters

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Extension of the effective stress concept to unsaturated soils has been a major concern for decades. Recent studies significantly contributed to the understanding of the fundamentals behind Bishop's parameter χ which is generally used to define the effective stress for unsaturated soils. Examination of the recently proposed methods showed that the contribution of suction to effective stress was often overestimated, especially in high suction range. In this study, considering that soil pores with different sizes contribute differently to the overall hydro-mechanical behaviour, a new method to determine Bishop's parameter χ is proposed. The key variable used in this method is the ratio of the change in water volume to the change in macro-pore void volume due to loading at constant suction. Shear strength data for a weakly expansive clay were used for validation. A good agreement was obtained between prediction and measurement, indicating the validity of the proposed method.

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“…Also, a pH of more than 10 is required to perform some reactions. The type and concentration of cations in soil moisture and pores as well as the type of clay mineralization are important in the reactions (Zhang et al, 2020). The addition of cement to clay in suitable conditions causes cation exchange reaction, pozzolanic reaction, integration, and carbonation (Li et al, 2020).…”

Section: Chemical Stabilization Of Claymentioning

confidence: 99%

Evaluating the Effect of Environment Acidity on Stabilized Expansive Clay

Jahromi

Noori

2023

Studia Geotechnica Et Mechanica

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In this article, the effects of environmental acidity on the mechanical and volumetric properties of cement-stabilized clay soils have been investigated through various tests on experimental scale. In this study, a problematic clay was chemically stabilized by cement under three treatment conditions including short term, medium term, and long term with different conditions varying from acid to alkaline environments, which were tested by different methods to evaluate their mechanical and volumetric behavior and properties. Mechanical characteristics assessment tests in this study include compaction tests, and unconfined compressive strength, which was conducted on samples under different conditions in terms of acidity and treatment time. The results of the study indicated that soil improvement by cement increases the mechanical strength and decreases the rate of soil swelling over time and treatment duration. However, the degree of acidity of the environment affects the chemical reactions of soil and cement, especially cement hydration, which causes changes in soil strength and volume variation due to swelling.

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Hydro-mechanical behavior of expansive soils with different dry densities over a wide suction range

Cited by 60 publications

References 40 publications

Behavior of Lime‐Stabilized Red Bed Soil after Cyclic Wetting‐Drying in Triaxial Tests and SEM Analysis

Behavior of Lime‐Stabilized Red Bed Soil after Cyclic Wetting‐Drying in Triaxial Tests and SEM Analysis

Determining Bishop's parameter χ based on pore size distribution

Evaluating the Effect of Environment Acidity on Stabilized Expansive Clay

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