A proposal of structural models for colluvial and lateritic soil profile from southwestern Brazil on the basis of their collapsible behavior

Benatti, Júlio César Beltrame; Miguel, Miriam Gonçalves

doi:10.1016/j.enggeo.2012.11.003

Cited by 22 publications

(3 citation statements)

References 18 publications

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“…3.1 Evaluation of Compressibility Benatti and Miguel (2013) proposed the structural models for colluvial and lateritic soil based on their three stages of collapsible behavior, considering the effects of matrix suction and cementation. Analogously, intact loess has typical characteristics of unsaturated and intergranular cementation.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States

et al. 2022

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Loess is widely deposited in arid and semi-arid areas and is characterized by low dry density, developed pore space, and loose structure, which is not commensurate with high structural strength and shear strength in the dry state. Many natural phenomena and experimental results show that intact loess is very sensitive to the change of water content, and a slight increase in water content can cause a rapid reduction in strength. Abundant information is available in the literature for the collapsibility of loess. However, research on the evolution of loess compressibility during wetting, which is very helpful in understanding loess collapsible deformation caused by long-term irrigation, remains minimal. To this end, in this article, the evolution of the compressibility of intact loess at different wetting stages is investigated by oedometer tests, and microstructure and pore size distribution (PSD) were characterized on intact loess specimens at different water contents before and after oedometer tests by scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) methods. The results show that the compression index (Cc) and secondary compression index (Cα) of intact loess depend on water content and vertical stress and change abruptly when vertical stress exceeds yield stress. Cα/Cc values of intact loess are not constant, which increases with vertical stress to a peak and then gradually decreases to 0.025. Wetting and loading can cause damage to the microstructure of intact loess; specifically, loading leads to the collapse of the overhead structure and the transformation from a bimodal PSD into a unimodal PSD, and wetting intensifies the collapse of the microstructure to form a compacted interlocking structure and promotes the transformation of medium pores into small pores.

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Section: Resultsmentioning

confidence: 99%

Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States

et al. 2022

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show abstract

“…Evaluation of compressibility Benatti and Miguel (2013) proposed the structural models for colluvial and lateritic soil based on their three stages of collapsible behavior, taking into account the effects of matrix suction and cementation.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Compressibility and Microstructure Evolution of Intact Loess During Wetting Process

Jian

Kong

Bai

et al. 2021

Preprint

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Loess is widely deposited in arid and semi-arid areas and is characterized by low dry density, developed pore space, and loose structure, which is not commensurate with that high structural strength and shear strength in the dry state. Many natural phenomena and experimental studies show that intact loess is very sensitive to the change of water content, with slight increases in water content causing a rapid reduction in strength. Abundant information is available in the literature for collapsibility of loess; however, the research on the evolution of loess compressibility during wetting is still minimal, which is very helpful to understand the loess collapsible deformation caused by long-term irrigation. In this paper, the evolution of compressibility of intact loess during wetting are studied by oedometer test, and the microstructure and pore size distribution (PSD) is characterized on intact loess specimens with different water content before and after oedometer tests by scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) methods. The results show that the compression index (Cc) and secondary compression index (Cα) of intact loess depend on water content and vertical stress and change abruptly after the vertical stress exceeds the yield stress. The Cα/Cc values of the intact loess are not constant, which increased with the vertical stress to peak and then gradually decreased and tend to 0.025. Both wetting and loading can cause microstructural damage to the intact loess, in which loading leads to the collapse of the overhead structure and transformation from a bimodal PSD into a single PSD, and wetting intensifies the collapse of microstructure to form a compacted interlocking structure and promotes the transformation of medium pores into small pores.

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“…O estudo das características microestruturais, mineralógicas e químicas das partículas constituintes é primordial para o entendimento básico das características e propriedades geotécnicas de um solo desenvolvido, principalmente, em ambiente tropical (ZHANG ET AL., 2017;BENATTI;MIGUEL, 2013;OTALVARO ET AL., 2016).…”

Section: Introductionunclassified

Caracterização e peculiaridades de um perfil típico de solo residual de basalto

Oliveira,

Maia Gutierrez,

Tsuyoshi Nonose

2023

Geosul

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As propriedades de um solo são influenciadas pelas condições geológicas, climáticas locais e mineralogia. O perfil de solo analisado, resultante de basalto, é constituído por dois conjuntos: superior (solo evoluído – Latossolo) e inferior (saprolito). Com o aumento da profundidade, os valores de NSPT e umidade tenderam a crescer e os teores de argila reduziram, enquanto os índices de plasticidade aumentaram, pressupondo a existência de um bloqueio da argila no conjunto superior. O solo evoluído exibiu uma distribuição de poros bimodal com predomínio de poros interagregados (70%) e redução no tamanho dos poros maiores com o aumento da profundidade. Essas peculiaridades são úteis na definição de parâmetros geotécnicos e justificam valores, nem sempre condizentes com os esperados, para os solos finos.

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A proposal of structural models for colluvial and lateritic soil profile from southwestern Brazil on the basis of their collapsible behavior

Cited by 22 publications

References 18 publications

Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States

Investigation on Compressibility and Microstructure Evolution of Intact Loess at Different Wetting States

Investigation on Compressibility and Microstructure Evolution of Intact Loess During Wetting Process

Caracterização e peculiaridades de um perfil típico de solo residual de basalto

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