Influence of Peripheral Velocity on Vane Shear Strength of an Artificial Clay

Chaney, RC; Demars, KR; Biscontin, Guido; Pestana, JM

doi:10.1520/gtj11140j

Cited by 145 publications

(18 citation statements)

References 9 publications

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“…The shear box was filled with water to saturate the gellan gum-treated soil and prevent any moisture loss from the specimen during testing. The initial dry densities before loading were 0.96, 1.23, 1.62, and 1.42 g/cm 3 on average for m c /m s = 1.0, 0.5, 0.2, and 0 soils, respectively. The target overburden stress of r v = 50, 100, 200, and 400 kPa was applied via a pneumatic actuator for 24 h to ensure that there was no A direct shear testing device (Humboldt HM-2560A) was used to perform direct shear tests.…”

Section: Direct Shear Testmentioning

confidence: 97%

“…Rod friction [76] and shear rate [3] effects were neglected due to the small penetration depth of 30 mm and the low peripheral velocity of 1.1 mm/min.…”

Section: Laboratory Vane Shear Testsmentioning

confidence: 99%

“…The undisturbed condition was investigated by sampling a 0.5-cm 3 piece of a cube (10 mm wide, 10 mm long, 5 mm high) of dried gellan gum-treated soil that had not been subjected to any testing. The disturbed condition was investigated by collecting fragments of 1% gellan gum-treated soil that had been crushed during unconfined compression tests.…”

Section: Scanning Electron Microscope (Sem) Imagesmentioning

confidence: 99%

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Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

2018

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Microbial biopolymers have recently been introduced as a new material for soil treatment and improvement. Biopolymers provide significant strengthening to soil, even in small quantities (i.e., at 1/10th or less of the required amount of conventional binders, such as cement). In particular, thermo-gelating biopolymers, including agar gum, gellan gum, and xanthan gum, are known to strengthen soils noticeably, even under water-saturated conditions. However, an explicitly detailed examination of the microscopic interactions and strengthening characteristics between gellan gum and soil particles has not yet been performed. In this study, a series of laboratory experiments were performed to evaluate the effect of soil-gellan gum interactions on the strengthening behavior of gellan gum-treated soil mixtures (from sand to clay). The experimental results showed that the strengths of sand-clay mixtures were effectively increased by gellan gum treatment over those of pure sand or clay. The strengthening behavior is attributed to the conglomeration of fine particles as well as to the interconnection of fine and coarse particles, by gellan gum. Gellan gum treatment significantly improved not only interparticle cohesion but also the friction angle of clay-containing soils.

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Section: Direct Shear Testmentioning

confidence: 97%

“…Rod friction [76] and shear rate [3] effects were neglected due to the small penetration depth of 30 mm and the low peripheral velocity of 1.1 mm/min.…”

Section: Laboratory Vane Shear Testsmentioning

confidence: 99%

Section: Scanning Electron Microscope (Sem) Imagesmentioning

confidence: 99%

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Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

2018

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“…Consequently, comparative work including other methods is necessary for translating dynamic data to quasi-static values common in soil engineering (e.g., Stark et al 2009). A second method based on an inverse sin-hyperbolic equation (Randolph and Hope 2004;Mitchell and Soga 2005;Chung et al 2006) and a third based on a power-law equation (Biscontin and Pestana 2001;Lehane et al 2009) are examined. All corrections are predicated on the ratio of the dynamic penetration rate (v dyn ) to v ref .…”

Section: Introductionmentioning

confidence: 99%

In situ dynamic piezocone penetrometer tests in natural clayey soils — a reappraisal of strain-rate corrections

SteinerAlois

KopfAchim

L’HeureuxJean-Sebastien

et al. 2014

Can. Geotech. J.

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Cone penetration testing with pore pressure measurement (CPTU) is a cost-and time-efficient way of collecting in situ geotechnical parameters of near-surface marine soils for cable and pipeline tracks, offshore foundations, and geohazard identification. The measured dynamic CPTU parameters (cone penetration resistance, sleeve friction, pore pressure) are higher than the measured static CPTU parameters. This mismatch is caused by the different penetration rates used for dynamic and static CPTU tests (dynamic tests have up to 500 times higher penetration rates than the static tests; i.e., with the commonly used 2 cm/s penetration rate). This study presents comprehensive Calypso piston and gravity core as well as dynamic and static CPTU datasets acquired in the landslide-prone Sørfjorden area (Finneidfjord, northern Norway). The fjord-marine sediments at the study site are characterized as normally consolidated to slightly over consolidated clay-dominated soils with embedded layers of sandy silt to sand. The dynamic CPTU results were corrected to match the nearby static CPTU (i.e., distance less than 10 m) using strain-rate factors (SF) derived from three known correction methods. Based on a statistical test and visual comparison of dynamic and static CPTU profiles, the modified inverse sin-hyperbolic correction method is found to be best suited for the strain-rate correction of dynamic CPTU tests, and results in SF less than 1.35 for the corrected cone penetration resistance and up to 2.4 for the sleeve friction. Our data illustrate a positive correlation between penetration rate and penetration depth, which is governed by the consolidation state of the clays. The good agreement between SF-corrected dynamic CPTU data from 34 deployments (acquired within less than 36 h shiptime) with data obtained from static CPTU and laboratory experiments on sediment cores further demonstrates that the MARUM dynamic CPTU device is a powerful tool for characterizing the properties of surficial seafloor sediments in shallow-water environments.Key words: dynamic cone penetration testing with pore pressure measurement (CPTU), static CPTU, clayey soils, in situ comparison, Finneidfjord, weak layer, strain-rate effect, soil-specific rate coefficient.Résumé : L'essai de pénétration du cône avec la mesure des pressions interstitielle (CPTU) est une façon efficace d'un point de vue temps et coûts pour récolter des paramètres géotechniques in situ de sols marins près de la surface pour des applications comme le placement de câbles et pipelines, les fondations en mer et l'identification des risques géotechniques. Les paramètres dynamiques CPTU mesurés (résistance à la pénétration du cône, friction de l'enveloppe, pression interstitielle) sont supérieurs aux paramètres statiques CPTU mesurés. Cette différence est due aux taux de pénétration différents qui sont utilisés pour les essais dynamiques et statiques de CPTU (les essais dynamiques ont des taux de pénétration jusqu'à 500 fois plus élevés que les essais statiques, par exemple un taux de...

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“…The soil viscosity coefficient has been applied for dynamic penetrations with penetrometers in clayey sediments, where it ranges between 0.04 and 1.50 (Dayal and Allen 1975;Dayal 1980;Randolph 2004;O'Loughlin et al 2004O'Loughlin et al , 2013Einav and Randolph 2005;Aubeny and Shi 2006;Low et al 2008;Zhou and Randolph 2009;Young et al 2011;Nazem et al 2012;Steiner et al 2012Steiner et al , 2014Airey 2013, 2014). Applications of the strain rate correction on silty sediments yield a soil viscosity coefficient between 0.13 and 0.36 (Perlow and Richards 1977;Biscontin and Pestana 2001). Several authors employing lightweight dynamic penetrometers penetrating sands at high rates have used values of 0.7-1.5 for the soil viscosity coefficient λ, although Dayal (1974), Dayal and Allen (1975), and Lunne et al (1997) concluded from laboratory observations that the strain rate correction is applicable only to cohesive sediments.…”

Section: Processing Of Impact Penetrometer Datamentioning

confidence: 99%

Validation of impact penetrometer data by cone penetration testing and shallow seismic data within the regional geology of the Southern North Sea

2015

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This study presents the assessment of total cone resistance from in situ deceleration measurements using the Lance Insertion Retardation meter (LIRmeter) in the Southern North Sea. The penetrometer is equipped with a measurement lance that is up to 6 m in length. The aim was to validate LIRmeter data interpretation within the regional geological context by comparison with static velocity cone penetration testing (CPT) and sub-bottom profiles. In total, 13 datasets were taken, in addition to preexisting hydroacoustical and static velocity CPT datasets. The dynamically acquired data were processed and compared to the reference static velocity data. The validation encourages the use of acceleration-based dynamic penetration tests, since a high degree of agreement was demonstrated between independently acquired dynamic and static cone resistance data. Moreover, the results reveal evidence of two successive formations with different geotechnical properties, consistent with existing knowledge on the regional setting. Additionally, there is novel indication of an incised glacial valley with muddy low-permeability sediments extending much further than reported to date, which would necessitate updating of older maps. The main advantage of penetrometer-based deceleration measurements lies in the robustness of the method, and the reliability of the sensors. However, penetration depth is, for dimensioning reasons, limited to the order of a few meters. Additionally, data processing includes the dependency of knowledge about the soil type to correct the dynamic data. These limitations can be satisfactorily outweighed by combination with reference data from static velocity tests, as demonstrated by integrating these data into a soil classification scheme.

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Influence of Peripheral Velocity on Vane Shear Strength of an Artificial Clay

Cited by 145 publications

References 9 publications

Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

In situ dynamic piezocone penetrometer tests in natural clayey soils — a reappraisal of strain-rate corrections

Validation of impact penetrometer data by cone penetration testing and shallow seismic data within the regional geology of the Southern North Sea

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