Evaluation and Control of Collapsible Soils

Basma, Adnan A.; Tuncer, Erdil Riza

doi:10.1061/(asce)0733-9410(1992)118:10(1491)

Cited by 88 publications

(27 citation statements)

References 5 publications

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“…Some researchers (Basma and Tuncer, 1992;Dipova, 2002;Zorlu, 2003) investigated different types of collapsible soils and suggested empirical relations for indirect estimation of the collapse potential based on easily determined physical properties of these soils. Same authors, who investigated eight different soils, tufas in Antalya city (Turkey) and caliches in Adana (Turkey), indicated that there exist statistically significant empirical relationships between the collapse potential and unit weight, specific gravity, void ratio, coefficient of compressibility and percent of fines.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

An experimental investigation of the mechanical behavior and microstructural features of a volcanic soil (Isparta, Turkey) and stability of cut slopes in this soil

Avşar

Ulusay

Mutlutürk

2015

Engineering Geology

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Section: Accepted Manuscriptmentioning

confidence: 99%

An experimental investigation of the mechanical behavior and microstructural features of a volcanic soil (Isparta, Turkey) and stability of cut slopes in this soil

Avşar

Ulusay

Mutlutürk

2015

Engineering Geology

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“…Habibagahi and Taherian proposed the use of three types of neural networks to predict the collapse potential based on the initial collapsible soil properties. Basma and Tuncer investigated the effect of compaction water content, initial dry unit weight, applied pressure at wetting, and soil type on the collapse potential by conducting 138 single oedometer tests on eight different soil types obtained from different locations in Jordan. Basma and Tuncer proposed a method to estimate the water content after which no collapse takes place (ie, critical water content).…”

Section: Introductionmentioning

confidence: 99%

“…Basma and Tuncer investigated the effect of compaction water content, initial dry unit weight, applied pressure at wetting, and soil type on the collapse potential by conducting 138 single oedometer tests on eight different soil types obtained from different locations in Jordan. Basma and Tuncer proposed a method to estimate the water content after which no collapse takes place (ie, critical water content). Furthermore, a nomograph was suggested by Reference to predict the collapse potential based on the pressure at wetting, coefficient of uniformity, dry unit weight, and the critical water content.…”

Section: Introductionmentioning

confidence: 99%

“…Basma and Tuncer proposed a method to estimate the water content after which no collapse takes place (ie, critical water content). Furthermore, a nomograph was suggested by Reference to predict the collapse potential based on the pressure at wetting, coefficient of uniformity, dry unit weight, and the critical water content. Qian et al conducted a series of laboratory tests on nine groups, each composed of three undisturbed collapsible soil specimens to study the hydro‐collapsibility and characteristics of loess in Northwest China.…”

Section: Introductionmentioning

confidence: 99%

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Modelling the behavior of inundated collapsible soils

Ashour

Abbas

Altahrany

et al. 2020

Engineering Reports

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The properties of collapsible soil exhibit a lot of sensitivity toward the increase of water content, especially when the soil is close to the dry state. The inundation of collapsible soils induces a considerable drop in the void ratio (e) (ie, collapse potential, Cp, increase), which in return affects the dry unit weight ( d ), friction angle ( ), and shear strength of the soil. The presented study employs large numbers of sandy and silty specimens of collapsible soils with different initial conditions (gathered from the literature) to develop a correlation that evaluates Cp of the soil (ie, settlement) due to inundation. The developed relationship accounts for the soil's initial properties such as the void ratio (e 0 ), degree of saturation (Sr), and pressure applied to the inundated specimens. The presented model reflects the significant influence of Sr on Cp of inundated soil which considerably decreases by the increase of Sr. The determined properties of inundated collapsed soil, such as e and , are employed to construct the post-inundation stress-strain curve (ie, mobilized shear strength) of the soil based on the concepts of the conventional triaxial test. Comparisons between predicted and measured stress-strain curves of inundated collapsible soils are presented for validation. K E Y W O R D Scollapse potential, collapsible soil, constitutive model, stress-strain curve INTRODUCTIONCollapsible soils or metastable soils are unsaturated soils that undergo a significant volume reduction upon saturation with or without additional load. Generally, collapsible soils maintain an open "honeycombed" structure that could have negative pore water pressure and cementing agents that result in considerable shear strength. As a result of wetting, effective stresses are reduced due to the dissipation of the negative pore water pressure. Furthermore, the water dissolves or softens the bonds between the particles, causing a reduction in shear strength, nonetheless a denser particle packing.Collapsible soils may exist in natural deposits as well as in man-made fills and have been under investigation for many years in a broad literature. El Howayek et al 1 investigated the susceptibility of man-made fills to undergo collapse by conducting experimental investigations on two loess soil types that were compacted to a wide range of values of relative compaction (RC). El Howayek et al 1 observed that even specimens compacted to approximately 90% RC on the dry side of the optimum moisture content experienced large wetting-induced strains. In general, El Howayek et al 1 concluded that the collapse potential increases with decreasing compaction water content, RC, and degree of saturation.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Tuncer (1992) pesquisaram os parâmetros que afetam o potencial de colapso de um solo, utilizando diferentes tipos de solos, compactados. Os corpos de prova sul do Brasil, concluiu que os recalques provenientes do colapso estrutural do solo por efeito da inundação provavelmente só seriam observados nos trechos em que a barragem fosse de pequena altura.…”

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Influências de aspectos estruturais no colapso de solos do norte do Paraná

Gutierrez¹

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AGRADECIMENTOSDurante vários anos dedicados à elaboração desta tese, várias pessoas e entidades colaboraram, direta ou indiretamente, no desenvolvimento deste trabalho, às quais registro os meus agradecimentos: Ao Prof. Dr. Orencio Monje Vilar pela confiança, orientação, incentivo e amizade que sempre marcaram o nosso relacionamento. À Profa. Dra. Maria Teresa de Nóbrega pela orientação, discussões técnicas e colaboração nas análises micromorfológicas e, acima de tudo pela amizade e constante estímulo na realização deste trabalho. À Profa. Dra. Maria Luiza Melchert de Carvalho e Silva pelo apoio recebido nos momentos mais difíceis, na interpretação das análises mineralógicas e pela amizade. e Igor, pelos bons momentos de convívio e troca de experiências. Aos funcionários do Departamento de Geotecnia da EESC/USP, em especial à Maristela, Neiva, Álvaro, Erivelto, José Luís, Oscar e Benedito pela amizade, receptividade e atenção manifestadas em todos os momentos. Ao meu marido Gutierrez, aos meus filhos Isabella e Alexandre e à minha mãe Deolinda, pela imensa paciência, apoio e compreensão em todos os momentos. E especialmente a Deus, que sempre iluminou o meu caminho. RESUMO GUTIERREZ, N. H. M. Influências de aspectos estruturais no colapso de solos do norte do Paraná. 2005. 311p. Tese (Doutorado) -Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2005. Este trabalho tem como objetivo avaliar o comportamento colapsível, sob o aspecto estrutural, de três perfis de solos tropicais típicos, que ocorrem na região norte do Paraná e que podem ser considerados representativos do território brasileiro. Dois desses perfis são classificados pela pedologia como Latossolos Vermelhos, um de textura argilosa e outro de textura média e o terceiro perfil, de textura argilosa, como Nitossolo Vermelho. Tem por objetivo, também, em função da abordagem pedológica adotada para a caracterização dos solos, poder associar comportamentos característicos observados para as diferentes classes estudadas, visando a extrapolação e aplicação desses conhecimentos a outros solos de ocorrência em zona tropical que se enquadrem nas mesmas classes dos materiais estudados. Ensaios edométricos simples e duplos foram conduzidos para a avaliação da colapsibilidade dos solos. O acompanhamento da evolução da macro e da microestrutura dos solos, antes e após colapso, através de análises micromorfológicas, permitiu estabelecer correlações com a dinâmica do colapso. Os resultados apontam um comportamento colapsível em todos os níveis dos perfis dos Latossolos enquanto que, para o horizonte característico do Nitossolo, as deformações volumétricas por inundação não foram suficientes para classificá-lo como colapsível. Os resultados ressaltam, ainda, a influência da tensão de pré-adensamento virtual e dos fatores pedogenéticos na variabilidade das características físicas dos solos analisados e na magnitude do colapso. Os maiores coeficientes de colapso parecem estar associados principalmente à presença, em maior proporção, de plasma micr...

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Evaluation and Control of Collapsible Soils

Cited by 88 publications

References 5 publications

An experimental investigation of the mechanical behavior and microstructural features of a volcanic soil (Isparta, Turkey) and stability of cut slopes in this soil

An experimental investigation of the mechanical behavior and microstructural features of a volcanic soil (Isparta, Turkey) and stability of cut slopes in this soil

Modelling the behavior of inundated collapsible soils

Influências de aspectos estruturais no colapso de solos do norte do Paraná

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