Stress Conditions in NGI Simple Shear Test

Lucks, Albert Stanley; Christian, John T.; Brandow, Gregg E.; Höeg, Kaare

doi:10.1061/jsfeaq.0001729

Cited by 38 publications

(9 citation statements)

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“…Therefore, the results are fully and directly comparable, consider the vertical effective stresses calculated for 16 equal slices (slice thickness is 3 times the maximum particle diameter) across the specimen for D-100 and L-100, respectively. Similar to the previous findings of Roscoe [35], Lucks et al [28], and Budhu [7], the leading edge of the specimen experiences compression, while the trailing edge clearly experiences extension.…”

Section: Laboratory Validated 3d Dem Simulationssupporting

confidence: 89%

“…In addition to non-uniformities along the boundaries, a number of previous experimental studies [7,8,45] and numerical studies [10,28,38] showed that the stress conditions within the specimen differ from those on the horizontally oriented specimen boundaries. To capture internal localized measurements of stress, five measurement spheres were placed within the specimen (Fig.…”

Section: Laboratory Validated 3d Dem Simulationsmentioning

confidence: 99%

“…While non-uniformities exist, most studies show that the core region of the specimen is under uniform stress and strain conditions [10,18,19,28,33,34,38]. Through elaborate instrumentation on both the Cambridge and the NGI-type devices, Budhu [7] showed that the specimen core (measured using a central load cell on the horizontal boundary) was relatively unaffected by non-uniformities and that reliable normal and shear stress information could be obtained from this region of the specimen.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the stress distribution in a laminar direct simple shear device and implications for test data interpretation

2021

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Direct simple shear (DSS) testing allows observation of load-deformation response under rotation of the major principal stress plane, which is descriptive of many actual field problems.While the simplicity of the test configuration makes its use popular in research and industry, key uncertainties still remain regarding the interpretation of the laboratory data. This study uses laboratory validated discrete element method (DEM) models to examine the stress transmission in laminar-type direct simple shear devices under drained constant effective stress conditions. The DEM models (comprised of spheres) closely replicate physical specimens of precision chrome steel ball bearings for which the properties (e.g., shape, surface friction, and stiffness) were measured directly. The DEM models were also validated using experimental tests, so that conclusions regarding the system response can be derived with confidence from the available DEM data. The testing program included both loose and dense specimens, allowing for a comparison of the influence of density on stress state which has not been examined in previous simple shear DEM studies. Differences were observed between vertical effective stresses and shear stresses derived from boundary measurements (as commonly carried out in experimental programs) and those derived from force measurements within the DEM specimens. The failure state of the material in

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Section: Laboratory Validated 3d Dem Simulationssupporting

confidence: 89%

Section: Laboratory Validated 3d Dem Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the stress distribution in a laminar direct simple shear device and implications for test data interpretation

2021

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“…B. [16,25,26]) dargestellt, wobei die berechneten Zugspannungen im Versuch von der Bodenprobe nicht aufnehmbar sind. Diese Verteilung wurde annähernd auch in Laborversuchen gemessen.…”

Section: Aufsatz Articleunclassified

Untersuchungen zur Zellenkonstruktion und Auswertung von monotonen Einfachscherversuchen mit Sand

Glasenapp

Rackwitz

2022

Geotechnik

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Der Einfachscherversuch ist ein anspruchsvoller Laborversuch, der bereits in vielen Studien für die Untersuchung von statischem und zyklischem Bodenverhalten eingesetzt wurde. Trotz der vielfältigen Einsatzmöglichkeiten wird der Einfachscherversuch nicht verbreitet angewendet und es existieren weder eine Euronorm noch eine deutsche Norm für diese Art von Versuch. In diesem Beitrag werden die Anforderungen an ein Einfachschergerät definiert und die theoretischen Grundlagen zur Ermittlung des Spannungszustands dargestellt. Dazu werden die verschiedenen Gerätetypen für Einfachscherversuche vorgestellt und diskutiert. Um den Einfluss der Testrandbedingungen besser einschätzen zu können, werden monotone Versuche mit Sand an einem eigenen Gerät mit verschiedenen Zellenkonstruktionen durchgeführt. Für die Untersuchung der Probenverformung wird die PIV‐Methode eingesetzt. Anhand der Versuchsergebnisse werden die verschiedenen Randbedingungen und deren Einflüsse aufgezeigt und diskutiert sowie Hinweise für die Anwendung und Interpretation von Einfachscherversuchen gegeben.

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“…Por su parte, Lucks et al (1972) llegaron a las mismas conclusiones al estudiar las condiciones tensionales de un aparato de corte de célula cilindrica. Para ello utilizaron la técnica de los elementos finitos con una ecuación constitutiva elástica lineal.…”

Section: Caracterización Tensionalunclassified

Comportamiento de cimentaciones superficiales sobre suelos granulares sometidas a solicitaciones dinámicas.

Gepp¹

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Stress Conditions in NGI Simple Shear Test

Cited by 38 publications

References 0 publications

Analysis of the stress distribution in a laminar direct simple shear device and implications for test data interpretation

Analysis of the stress distribution in a laminar direct simple shear device and implications for test data interpretation

Untersuchungen zur Zellenkonstruktion und Auswertung von monotonen Einfachscherversuchen mit Sand

Comportamiento de cimentaciones superficiales sobre suelos granulares sometidas a solicitaciones dinámicas.

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