The cone penetration test in unsaturated silty sands

Yang, Hongwei; Russell, Adrian R.

doi:10.1051/e3sconf/20160909008

Cited by 3 publications

(4 citation statements)

References 21 publications

(22 reference statements)

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“…Lyell silty samples were subjected to a range of isotropic net confining stresses. Yang & Russell (2016) present plots of qc versus depth for CPTs performed in unsaturated samples. Stronger suctions caused larger cone penetration resistances.…”

Section: Cone Penetration Test Results In Unsaturated Sydney Sand Andmentioning

confidence: 99%

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Pitfalls in interpretation of cone penetration test data recovered from unsaturated geomaterials

Russell¹,

Reid²

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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Laboratory-controlled and field cone penetration test (CPT) results for unsaturated geomaterials (sands, silty sands, tailings) show that suction has a pronounced influence. The penetration resistances increase significantly due to the presence of suction when compared to those for saturated or dry states, for a given relative density and net confining stress. For unsaturated sands, when suction is included in the effective stress, the same semi-empirical expressions used for saturated conditions are found to link penetration resistance to the relative density and effective confining stress. However, the same is not true for unsaturated silty sands, as saturated and unsaturated silty sands behave very differently around a penetrating cone. Suction also has implications when using classification charts. Cone penetration test results from a range of soils and tailings for both saturated and unsaturated conditions are plotted in one type of chart. Suction-induced increases in penetration resistances, and changes of soil behaviours from partially drained/undrained to drained cause incorrect classifications and assessments that geomaterials are dilative. Failure to account for suction influences, and the altered material response, may also lead to overestimation of cyclic resistance ratio.

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Section: Cone Penetration Test Results In Unsaturated Sydney Sand Andmentioning

confidence: 99%

“…However, it is only in the past few years that correlations have emerged for the CPT that take into account the effects of unsaturation (Pournaghiazar et al 2013;Yang & Russell 2016). So far these have been limited to a clean quartz sand and a silty sand (decomposed granite).…”

Section: Introductionmentioning

confidence: 99%

Pitfalls in interpretation of cone penetration test data recovered from unsaturated geomaterials

Russell¹,

Reid²

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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“…Also, interpreting cone penetration test (CPT) results is complicated when the tailings is only partially saturated, as is predicting future saturated behaviour based on CPT data (e.g. Russell et al 2010;Yang & Russell 2016).…”

Section: Erroneous Density Readingsmentioning

confidence: 99%

How to compact filtered tailings

McKenna¹

2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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To control the risk of static or dynamic liquefaction, filtered tailings stacks are typically designed to be compacted and to remain unsaturated. In theory, compacting filtered tailings should be easy, since mines tend to produce a consistent, well-graded sandy silt or silty sand tailings. The filter presses are designed to produce tailings with a geotechnical moisture content within a narrow range; modest-sized equipment can compact the tailings in thin lifts; and traditional earthworks quality control methods are common and readily available.In practice, however, filtered tailings and mine owners often discover that the learning curve associated with compacting filtered tailings can be steeper than expected.The filter plant will typically produce tailings that are somewhat wet of the standard Proctor optimum moisture content, making compaction difficult. If not protected, tailings at the loadout can absorb water or freeze. The tailings stack must be kept graded to promote runoff. In some climates, evaporation may be insufficient for drying; in others, snow, ice, and freezing conditions present a challenge. At some mines, the tailings liquefy under cyclic loading by dozers, trucks, or compactors as they are being placed.Choosing a tailings field-density specification is not straightforward, especially where high stresses at the base of the stack can increase the risk of static or dynamic liquefaction. Method specs for compaction may be employed, but can be unreliable under certain conditions. A nuclear densometer often does not provide accurate readings of the density of some tailings, particularly those with elevated levels of metals. This paper presents practical, hard-won lessons and solutions from the field to aid in the design, operation, and closure of filtered tailings facilities based on firsthand experience in Canada and interviews with operators around the world, lessons that can help shorten the learning curve for new and existing filter stack operations.

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“…O SPT, CPT e o DMT são ensaios de campo bastante empregados para definir o perfil do subsolo e estimar parâmetros de projeto, bem como para avaliação da variabilidade do terreno. Entretanto, a interpretação dos resultados desses ensaios depende de correlações elaboradas para serem utilizadas em solos saturados ou secos (YANG, 2014). Tais correlações, quando aplicadas em solos parcialmente saturados, podem levar a erros sistêmicos na estimava de parâmetros, comprometendo, por sua vez, a aplicabilidade de modelos que são normalmente utilizados para este fim (POURNAGHIAZAR et al, 2014).…”

Section: Considerações Iniciaisunclassified

Previsão da curva tensão-recalque a partir de ensaios de campo e avaliação do efeito da condição não saturada em um perfil de solo tropical

Silva¹

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Aos meus pais pelo apoio incondicional e a minha avó, Maria Dolores, em memória. AGRADECIMENTOSÀ Deus, pela saúde e proteção de todos os dias.À minha família, que traduz tudo o que sou hoje. Aos meus pais por me incentivarem a seguir em busca das minhas conquistas. Ao meu pai, Valdemar Silva, minha maior referência de dedicação e comprometimento profissional. A minha mãe, Elizabeth Marques, por todo carinho, incentivo e por não medir esforços para realização dos meus sonhos. A minha irmã, que mesmo longe, é minha maior torcedora e revisora.Ao professor Heraldo Luiz Giacheti pela confiança e parceria ao longo deste trabalho.Agradeço pela paciência, pelos ensinamentos e pela orientação no decorrer desta pesquisa.Ao meu colega de trabalho, Breno Rocha, obrigada pela disponibilidade, por todo suporte técnico e pelos infinitos materiais encaminhados e dúvidas sanadas no decorrer da pesquisa.Aos técnicos do Departamento de Geotecnia da EESC-USP, principalmente ao Oscar, pelo auxilio sempre que preciso, além da amizade e companhia diária. Também aos funcionários do Departamento de Geotecnia: Neiva, Maristela, Álvaro e Herivelto por estarem sempre dispostos a nos ajudar.À todos os professores e professoras que tive o prazer de trabalhar durante a minha formação geotécnica e que tanto contribuíram, compartilhando seus conhecimentos e abrindo as portas da geotecnia. Em especial à professora Juliana Azoia Lukiantchuki, pelas conversas, amizade e oportunidade inicial de me aprofundar no meio geotécnico. E ao professor Orencio Vilar, pela atenção e prontidão em sempre ajudar.Às minhas amigas e companheiras de pós graduação: Deborah Perotti; Fabiane Ferrer; Fernanda Medeiros; Ivinny Barros; Camila Amorim; e Liana Rocha, pelas manhãs, tardes e noites de estudos e descontração compartilhadas. Sem esquecer daqueles que me acompanham desde a graduação, Gabriel Marques e Jean Belo, obrigada pelos materiais, pela companhia e pela amizade de sempre. Às minhas amigas "irmãs", que caminham ao meu lado desde as primeiras etapas da minha vida, sendo fonte de força, inspiração, incentivo e descontração diária: Juliana; Paula; Bianca; Gabriele S.; Camila; Gabriela; Amanda; Mariana; Maria Carolina; e Nicolly. À todos que passaram por mim durante essa jornada, me auxiliando de diversas maneiras, minha eterna gratidão! RESUMO SILVA, N. M. Previsão da curva tensão-recalque a partir de ensaios de campo e avaliação do efeito da condição não saturada em um perfil de solo tropical. 2019. 137 p. Dissertação

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The cone penetration test in unsaturated silty sands

Cited by 3 publications

References 21 publications

Pitfalls in interpretation of cone penetration test data recovered from unsaturated geomaterials

Pitfalls in interpretation of cone penetration test data recovered from unsaturated geomaterials

How to compact filtered tailings

Previsão da curva tensão-recalque a partir de ensaios de campo e avaliação do efeito da condição não saturada em um perfil de solo tropical

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