Creep behavior in Virginia Beach sand

KarimpourHamid,; LadePoul, V

doi:10.1139/cgj-2012-0467

Cited by 71 publications

(32 citation statements)

References 38 publications

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“…Pilot tests showed that particle crushing is negligible at a confining stress of 250 kPa when compared with tests performed at a confining stress of 8000 kPa. Previous studies (Karimpour and2013) showed that particle crushing is at the root of time-dependent behavior of quartz sand. Therefore, confining pressures of 250 and 8000 kPa, with more focus on the latter, were chosen to study stress relaxation of Virginia Beach sand.…”

Section: Experimental Programmentioning

confidence: 97%

“…More detailed information on specimen preparation, triaxial apparatus and testing procedure is described in Karimpour and Lade (2013).…”

Section: Page 8 Of 68mentioning

confidence: 99%

“…In an additional study (Karimpour and Lade 2013), seven 1-day creep experiments were performed on Virginia Beach sand under a confining stress of 8000 kPa and a "1-day creep curve" was achieved. As shown in Fig.…”

Section: Comparison Between 1-day Creep and 1-day Stress Relaxation Cmentioning

confidence: 99%

“…(2012) and Karimpour and Lade (2013) have experimentally studied creep behavior of granular materials.…”

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confidence: 99%

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Stress relaxation behavior in Virginia Beach sand

Lade

Karimpour

2015

Can. Geotech. J.

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Effects of strain rate on the stress-strain and subsequent stress relaxation behaviors have been studied by performing triaxial compression tests on dense Virginia Beach sand specimens at three different strain rates (ratio of 256 between the slowest and the fastest) under low and high confining pressures. For the tests performed under low confining pressure, the specimens that were initially sheared at a faster rate showed a slightly higher amount of stress relaxation, but almost identical stress-strain behaviors were achieved. For tests performed under high confining pressure, the same amount of strength was achieved at high axial strains (10% to 20%) but specimens sheared at higher strain rates showed a slightly stiffer stress-strain response at low axial strains (up to 10%). Similar to the tests performed under low confining pressure, higher strain rates produced to some extent higher amounts of stress relaxation.Effects of correction of axial strain due to load cell expansion and drainage condition during stress relaxation have also been studied and the results indicated that correction of axial strain and undrained condition will both increase the observed amount of stress relaxation.Moreover, a 1-day stress relaxation curve was obtained by connecting the ending stress-strain points of six stress relaxation tests initiated at different deviator stress levels, and this curve was found to be different from the 1-day creep curve obtained from a previous study. A long-term stress relaxation test was also performed, and it showed linear reduction of deviator stress with the logarithm of time during stress relaxation. Observations made are all aligned with the phenomenon of static fatigue and the proposed mechanism for time effects in granular materials.

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Section: Experimental Programmentioning

confidence: 97%

“…More detailed information on specimen preparation, triaxial apparatus and testing procedure is described in Karimpour and Lade (2013).…”

Section: Page 8 Of 68mentioning

confidence: 99%

Section: Comparison Between 1-day Creep and 1-day Stress Relaxation Cmentioning

confidence: 99%

“…(2012) and Karimpour and Lade (2013) have experimentally studied creep behavior of granular materials.…”

mentioning

confidence: 99%

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Stress relaxation behavior in Virginia Beach sand

Lade

Karimpour

2015

Can. Geotech. J.

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“…In this simulation, various initial strain rates were obtained in the loading phase under various creep stress levels. It can be anticipated that different creep strains will be obtained, since the amount of creep is related to the initial loading strain rates …”

Section: Experimental Validationmentioning

confidence: 99%

Modelling the time‐dependent behaviour of granular material with hypoplasticity

Wang

Yin

et al. 2018

Num Anal Meth Geomechanics

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Summary This paper presents a constitutive model for time‐dependent behaviour of granular material. The model consists of 2 parts representing the inviscid and viscous behaviour of granular materials. The inviscid part is a rate‐independent hypoplastic constitutive model. The viscous part is represented by a rheological model, which contains a high‐order term denoting the strain acceleration. The proposed model is validated by simulating some element tests on granular soils. Our model is able to model not only the non‐isotach behaviour but also the 3 creep stages, namely, primary, secondary, and tertiary creep, in a unified way.

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A Generalized Backward Euler algorithm for the numerical integration of a viscous breakage model

Marinelli

Buscarnera

2018

Num Anal Meth Geomechanics

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Summary This paper discusses the formulation and the numerical performance of a fully implicit algorithm used to integrate a rate‐dependent model defined within a breakage mechanics framework. For this purpose, a Generalized Backward Euler (GBE) algorithm has been implemented according to two different linearization strategies: The former is derived by a direct linearization of the constitutive equations, while the latter introduces rate effects through a consistency parameter. The accuracy and efficiency of the GBE algorithm have been investigated by (1) performing material point analyses and (2) solving initial boundary value problems. In both cases, the overall performance of the underlying algorithm is inspected for a range of loading rates, thus simulating comminution from slow to fast dynamic problems. As the viscous response of the breakage model can be recast through a viscous nucleus function, the presented algorithm can be considered as a general framework to integrate constitutive equations relying on the overstress approach typical of Perzyna‐like viscoplastic models.

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Creep behavior in Virginia Beach sand

Cited by 71 publications

References 38 publications

Stress relaxation behavior in Virginia Beach sand

Stress relaxation behavior in Virginia Beach sand

Modelling the time‐dependent behaviour of granular material with hypoplasticity

A Generalized Backward Euler algorithm for the numerical integration of a viscous breakage model

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