Recent Improvements in the Use, Interpretation, and Applications of DMT and SDMT in Practice

Marchetti, Silvano; Monaco, Paola Alfonsa Vieira Lo

doi:10.1520/gtj20170386

Cited by 9 publications

(9 citation statements)

References 15 publications

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“…A detailed description of the DMT equipment and test procedure can be found in Marchetti (1980), Marchetti et al (2001) and Marchetti & Monaco (2018).…”

Section: Flat Dilatometer Test (Dmt)mentioning

confidence: 99%

“…The flat dilatometer (DMT) has been shown to be an accurate test technique for site characterization (Marchetti et al, 2001;Marchetti & Monaco, 2018), compacted fill analyses (Queiroz et al, 2012;Amoroso et al, 2015), laterally loaded pile analyses (Robertson et al, 1987;Marchetti et al, 1991), as well as to predict foundation settlements (Schmertmann, 1986;Monaco et al, 2006;Anderson et al, 2007;Monaco et al, 2014). Very few studies evaluating the applicability of such test for predicting the complete loadsettlement curves of shallow foundations in unsaturated tropical soils have been found in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Load-Settlement Curves by the DMT in an Unsaturated Tropical Soil Site

Silva¹,

Rocha²,

Giacheti³

2019

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Several methods for prediction of the load-settlement curves of shallow foundations have been proposed based on in-situ testing data. However, the good accuracy of such prediction depends on the definition of appropriate soil stiffness. Seasonal variability and its influence on the soil behavior need to be considered for unsaturated tropical soils. In this context, this study uses a procedure to determine the complete load-settlement curves of shallow foundations by the flat dilatometer test (DMT) in an unsaturated tropical soil site, considering seasonal variability. The DMT and the plate load tests carried out at the experimental research site of the University of São Paulo (São Carlos, Brazil) are presented and discussed. It was found that the DMT is an adequate test for predicting soil stiffness, and the presented procedure allows a good estimate of the complete load-settlement curves. It was also observed that seasonal variability should be considered in the prediction of such curves for the studied site.

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“…A detailed description of the DMT equipment and test procedure can be found in Marchetti (1980), Marchetti et al (2001) and Marchetti & Monaco (2018).…”

Section: Flat Dilatometer Test (Dmt)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Load-Settlement Curves by the DMT in an Unsaturated Tropical Soil Site

Silva¹,

Rocha²,

Giacheti³

2019

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“…Penetration probes insertion may partly destroy the microstructure. In general, it can be expected that the DMT insertion may produce pronounced destructive effects in cemented soils (Baligh & Scott, 1975;Marchetti & Panone, 1981;Marchetti & Monaco, 2018).…”

Section: Maximum Shear Modulus (mentioning

confidence: 99%

“…Furthermore, the SDMT provides additional readings including: corrected first reading (p 0 ), corrected second reading (p 1 ), and time derived from DMT decay dilatometer test (T f lex ) with depth. The collection of multiple measurements is beneficial towards a comprehensive site characterization program at any given site (Marchetti, 1980;Marchetti et al, 2001;Marchetti & Monaco, 2018). However, the SDMT blade insertion in hard soils can be difficult precluding this test type.…”

Section: Seismic Testsmentioning

confidence: 99%

“…The V s values can be used for a static deformation analysis such as slope stability and the settlement and an evaluation for ground improvements (Burland et al, 1977;Kim & Park, 1999;Ashford & Sitar, 2002). Recently, maximum shear modulus (G 0 ) calculated from V s profiles has also been used to investigate non-textbook materials (Robertson, 2016;Marchetti & Monaco, 2018). For these reasons, the demand for a site investigation for V s and G 0 profiling is increasing rapidly in the field of geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

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Characterizing a Tropical Soil via Seismic in Situ Tests

Rocha¹,

Giacheti²

2019

Braz J Geophys

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ABSTRACT. The shear wave velocity (Vs) is an important geotechnical parameter to be used in dynamic problems (e.g. earthquakes and vibration problems) as well as in static deformation analysis such as excavations and foundation engineering design. There are several in situ seismic tests to determine Vs such as the crosshole and the downhole techniques, as well as hybrid tests (e.g. seismic dilatometer – SDMT). This paper presents crosshole, downhole and SDMT tests carried out in a typical tropical soil profile from Brazil. Advantages and limitations regarding the test procedures and interpretation are briefly presented and differences observed among Vs determined by these techniques are discussed. Shear wave velocities (Vs) estimated from the crosshole, downhole and SDMT tests ranging from 194 to 370 m/s. The shear wave velocity suggests that the experimental site could be divided into two strata, which are in agreement with soil profile description. The maximum shear modulus (G0) calculated from the Vs by theory of elasticity can be used to show the investigated tropical soil is a typical unusual geomaterial. This article also emphasizes that the SDMT is a useful test for site investigation since it allows a great means for profiling geostratigraphy and soil engineering properties during routine site investigation as well as for dynamics problems. Keywords: shear wave velocity, maximum shear modulus, crosshole, downhole, SDMT.RESUMO. A velocidade de onda cisalhante (Vs) é um parâmetro geotécnico empregado em análises dinâmicas (terremotos e problemas de vibração), bem como em análises estáticas (escavações e projeto de fundações). Existem vários ensaios sísmicos de campo para a determinação de Vs, entre eles as técnicas crosshole e downhole, e os ensaios híbridos (por exemplo, dilatômetro sísmico – SDMT). Este artigo apresenta os ensaios crosshole, downhole e SDMT realizados em um perfil típico de solo tropical do Brasil, as vantagens e limitações dos procedimentos de ensaio e de interpretação são brevemente apresentadas, e as diferenças observadas entre os valores de Vs determinados pelas diferentes técnicas são discutidas. Os perfis de Vs determinados pelas diferentes técnicas variaram de 194 a 370 m/s. A velocidade da onda cisalhante sugere que o campo experimental investigado pode ser dividido em dois horizontes, os quais estão de acordo com a descrição do perfil do solo estudado. O módulo de cisalhamento máximo (G0), calculado a partir de Vs pela teoria da elasticidade, pode ser utilizado para demonstrar o comportamento não convencional do solo investigado. Este artigo também enfatiza que o SDMT é um ensaio geotécnico útil para a investigação geotécnica do subsolo, uma vez que permite a definição do perfil estratigráfico e a estimativa de parâmetros estáticos e dinâmicos de um projeto.Palavras-chave: velocidade de onda cisalhante, módulo de cisalhamento máximo, crosshole, downhole, SDMT.

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Accumulated Plastic Strain Behavior of Granite Residual Soil under Cycle Loading

et al. 2020

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Recent Improvements in the Use, Interpretation, and Applications of DMT and SDMT in Practice

Cited by 9 publications

References 15 publications

Prediction of Load-Settlement Curves by the DMT in an Unsaturated Tropical Soil Site

Prediction of Load-Settlement Curves by the DMT in an Unsaturated Tropical Soil Site

Characterizing a Tropical Soil via Seismic in Situ Tests

Accumulated Plastic Strain Behavior of Granite Residual Soil under Cycle Loading

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