Influence of Specimen-Reconstituting Method on the Undrained Response of Sand

Chaney, RC; Demars, KR; Vaid, Y. P.; Sivathayalan, Siva; Stedman, David James

doi:10.1520/gtj11110j

Cited by 236 publications

(24 citation statements)

References 17 publications

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“…Other researchers have indicated that tests on samples prepared by dry funnel pluviation are more stable and dilatant than those prepared by wet deposition (Benahmed et al, 2004;Canou, 1989). Vaid et al (1999) confirmed this finding and also showed that wet deposition promotes the quicker onset of liquefaction compared to pluviation under water. In their laboratory investigation, Yamamuro et al (2008) concluded that dry pluviation causes the instability of samples as opposed to the method of sedimentation.…”

Section: Introductionsupporting

confidence: 70%

Efecto de la presión de confinamiento y el método de deposición sobre la respuesta de corte no drenada de arena de densidad media

2011

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This study examines the effects of the confining pressure and sample preparation method on the shearing behavior shown by sand from the Chlef River (Algeria). Undrained monotonic triaxial compression tests were performed on samples with an initial relative density of 50% at initial confining pressures of 50 to 200 kPa. Samples were prepared using two depositional methods: dry funnel pluviation and wet deposition. Our results reveal marked differences in the undrained shearing responses produced under identical conditions of density and stress and therefore determined by the soil fabric. Thus, at low confining pressures, samples prepared by the wet deposition method showed complete static liquefaction (zero effective confining pressure and zero stress difference). For both sample types, as confining pressures increased, effective stress paths exhibited increasing resistance to liquefaction indicated by increasing dilatant tendencies.Keywords: liquefaction, sand, dry funnel oluviation, wet deposition, triaxial, confining pressure ResumenEn este trabajo se han estudiado los efectos de la presión de confinamiento y los métodos de preparación de muestras sobre el comportamiento de rotura de arena Chlef. Los resultados de las pruebas sin escurrir monótona de compresión triaxial realizadas en muestras con una densidad relativa inicial del 50% y presiones de confinamiento inicial variaron desde 50 hasta 200 kPa. Las muestras fueron preparadas por dos métodos de deposición seca con embudo de pluviacion y deposición húmeda. Se encontró que existía una marcada diferencia en el comportamiento sin escurrir a pesar de que las condiciones de la densidad y el estrés eran idén-ticas. La conclusión fue que la estructura del suelo fue la responsable de este resultado. Los resultados también indicaron que a baja presión de confinamiento, las muestras preparadas mediante un método de deposición húmedo, completan la licuefacción estática (ninguna presión de confinamiento efectiva y ninguna diferencia de estress). Los resultados indicaron también que a bajas presiones ISSN (print): 1698-6180. ISSN (online): 1886-7995

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Section: Introductionsupporting

confidence: 70%

Efecto de la presión de confinamiento y el método de deposición sobre la respuesta de corte no drenada de arena de densidad media

2011

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“…Laboratory observations have consistently found that two specimens of a sand prepared by different reconstitution methods to the same density may display quite different responses to applied monotonic loading under otherwise similar conditions (e.g., Arthur and Menzies 1972;Oda 1972;Miura and Toki 1982;Vaid et al 1999;Yang et al 2008). The differences are thought to be linked to the different fabrics of the specimens formed by the different methods, which can be defined as the spatial arrangement of sand particles and associated voids (Brewer 1964;Oda and Iwashita 1999).…”

Section: Introductionmentioning

confidence: 99%

Failure Modes of Sand in Undrained Cyclic Loading: Impact of Sample Preparation

Sze¹,

Yang²

2014

J. Geotech. Geoenviron. Eng.

199

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This paper presents a systematic experimental investigation into the impact of specimen preparation on the cyclic loading behavior of saturated sand, including the deformation pattern, pore-water pressure generation, stress-strain relationship, and cyclic shear strength. Moist tamping and dry deposition were used in the laboratory to prepare sand specimens with distinct fabrics for cyclic triaxial tests under a range of conditions. It is found that the soil fabric formed by dry deposition can lead to unique failure modes different from those of moist-tamped samples in certain situations. These failure modes are hybrid in nature, characterized by a contractive response in the form of limited flow followed by cyclic strain hardening in the form of either cyclic mobility or plastic-strain accumulation. The hybrid nature of the failure patterns makes defining failure for liquefaction-resistance evaluation crucial; the conventional failure criteria based on a certain level of strain or pore-water pressure do not appear to properly represent the failure mechanism involved and may lead to a substantial overestimation of liquefaction resistance. The experiments reveal that the method used to reconstitute specimens or the soil fabric they form plays a role that is far more complicated than previously thought. Depending on the combination of relative density, confining stress, and degree of stress reversal in cyclic loading, a change of reconstitution method can have a marked or little effect on the nature of the response in terms of deformation pattern and failure mechanism; nevertheless, the two reconstitution methods always give significantly different liquefaction-resistance values under otherwise similar testing conditions.

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“…Hence, the choice of a proper sample preparation method is essential to determine the 9 instability potential of sandy soils. The sedimentation deposition method tends to reproduce well field performance as shown by Chaney et al (1999). In this present study, dry funnel pluviation was used as a sample preparation method in order to replicate the soil conditions at the field.…”

Section: Experimental Program Preparation Methodsmentioning

confidence: 96%

Shear Behavior of Sand–Silt Mixtures: A Laboratory Investigation of Coastal Silty Sand Soils of Mostaganem

Derkaoui

Missoum²,

Bendani³

et al. 2015

Marine Georesources & Geotechnology

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In recent years, interest in understanding the mechanisms of mechanical instability of porous media leading to catastrophic failure has been continuously revised to include new porous media parameters generating the phenomenon of liquefaction under static or dynamic loadings. Results from experimental test programs have concluded to many physical concepts based on material intrinsic properties, initial states and other characteristics. Despite the great progress on the subject, these concepts do not allow a unified treatment of such porous media. The assessment of critical shear strength of sandy soils as porous media under undrained conditions is a major challenge in stability analysis. Such strength serves to evaluate the occurrence of flow deformation under liquefaction phenomena. The determination of the critical undrained strength is essentially fundamental for the design of soil structures such as earth dams, bridge supports, building foundations as well as soil densification process in order to avoid catastrophic failure due to soil instability manifested by failure or large displacement such as settlement. In this work, experimental program on reconstituted loose and medium dense specimens of terrigenous silica sands with different specified fine contents was carried out in order to analyze its mechanical behavior under undrained conditions. The present paper is an attempt to experimentally describe mechanical behavior and theoretically justify such response of loose and medium dense sand by means of critical state soil parameters

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Influence of Specimen-Reconstituting Method on the Undrained Response of Sand

Cited by 236 publications

References 17 publications

Efecto de la presión de confinamiento y el método de deposición sobre la respuesta de corte no drenada de arena de densidad media

Efecto de la presión de confinamiento y el método de deposición sobre la respuesta de corte no drenada de arena de densidad media

Failure Modes of Sand in Undrained Cyclic Loading: Impact of Sample Preparation

Shear Behavior of Sand–Silt Mixtures: A Laboratory Investigation of Coastal Silty Sand Soils of Mostaganem

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