Assessment of test data for selection of 3-D failure criterion for sand

Lade, Poul V.

doi:10.1002/nag.471

Cited by 71 publications

(36 citation statements)

References 43 publications

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“…Several experimental studies have shown that the friction angle in TE, e CS  , is close to c CS  for pluviated sands (e.g. Vaid et al 1990;Lade 2006). In the present study, a stress ratio Fig.…”

Section: Fig 10 Critical State Strength Of Hostun Sand In Compressisupporting

confidence: 71%

Critical State–Based Interpretation of the Monotonic Behavior of Hostun Sand

Azeiteiro

Coelho

Taborda

et al. 2017

J. Geotech. Geoenviron. Eng.

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A series of bender element tests and drained and undrained monotonic triaxial compression and extension tests were performed on air-pluviated samples of Hostun sand. Samples were prepared to different initial void ratios, consolidated under various isotropic and anisotropic stress states and sheared using different stress-paths and a wide range of deformations to characterise the sand's stress-strain response. The results suggest that the sand's small-strain behaviour essentially depends on the current void ratio and mean effective stress. Within the medium to large strain range, a state parameter approach in conjunction with the critical state framework can successfully predict the distinctive states of the sand's monotonic response, namely the phase transformation, the peak stress ratio and the critical states. Furthermore, the data is used to examine a stress-dilatancy relationship often incorporated in constitutive models. The characterisation presented herein aims at assisting the efficient calibration of numerical models and provides insight into this sand's behaviour, thus supporting the interpretation of results of physical modelling involving this sand. This paper highlights the importance of characterising sand's behaviour over the full strain range and shows that accurate predictions of the critical state and small-strain stiffness are crucial to assess other aspects of the sand's behaviour.

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Section: Fig 10 Critical State Strength Of Hostun Sand In Compressisupporting

confidence: 71%

Critical State–Based Interpretation of the Monotonic Behavior of Hostun Sand

Azeiteiro

Coelho

Taborda

et al. 2017

J. Geotech. Geoenviron. Eng.

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“…Usually, the 2D strength criterion underestimates the actual strength when b ½ 5 ðs 0 2 2 s 0 3 Þ=ðs 0 1cyc 2 s 0 3 Þ . 0, where b represents the role of intermediate stress (Matsuoka and Nakai 1982;Lade 2006). However, in this study, the 2D failure criterion still can predict the shear strength with acceptable accuracy for small b values (≅ 0.01).…”

Section: Finite-element Simulationmentioning

confidence: 64%

Stress-Strain Degradation Response of Railway Ballast Stabilized with Geosynthetics

Indraratna

Nimbalkar

2013

J. Geotech. Geoenviron. Eng.

153

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Large cyclic loading on ballasted railroad tracks is now inevitable owing to an increased demand for freight and public transport. This leads to a progressive deterioration and densification of railroad ballast and consequently to the loss of track geometry and differential settlement. Understanding these complex stressstrain and degradation mechanisms is essential to predict the desirable track maintenance cycle, as well as the design of new track. This paper presents the results of cyclic drained tests and numerical studies carried out on a segment of model railway track supported on geosynthetically reinforced railroad ballast bed. The relative performance and effectiveness of single-and dual-layer configurations of geosynthetic reinforcement was evaluated using a large-scale prismoidal triaxial chamber. Laboratory tests on unreinforced and reinforced railway track were simulated in a numerical model, and the results were then analyzed to better understand the distribution of displacements and stresses inside the railroad ballast layer. It was observed that in view of strain and breakage control, both the type of reinforcement and its layout played a vital role in improving the capacity of the track. These laboratory test findings were supported by the predictions from an advanced elastoplastic numerical analysis. Abstract: Large cyclic loading on ballasted railroad tracks is now inevitable owing to an increased demand for freight and public transport. This leads to a progressive deterioration and densification of railroad ballast and consequently to the loss of track geometry and differential settlement. Understanding these complex stress-strain and degradation mechanisms is essential to predict the desirable track maintenance cycle, as well as the design of new track. This paper presents the results of cyclic drained tests and numerical studies carried out on a segment of model railway track supported on geosynthetically reinforced railroad ballast bed. The relative performance and effectiveness of single-and dual-layer configurations of geosynthetic reinforcement was evaluated using a large-scale prismoidal triaxial chamber. Laboratory tests on unreinforced and reinforced railway track were simulated in a numerical model, and the results were then analyzed to better understand the distribution of displacements and stresses inside the railroad ballast layer. It was observed that in view of strain and breakage control, both the type of reinforcement and its layout played a vital role in improving the capacity of the track. These laboratory test findings were supported by the predictions from an advanced elastoplastic numerical analysis.

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“…These conflicting observations may be caused by the differences in sample conditions or testing methods. The data of three-dimensional true triaxial experiments from the literature were evaluated and factors influencing the angle of shearing resistance were reviewed by Lade et al [9]. It is well accepted that different mechanical behaviors may arise from samples with similar void ratios but different fabrics.…”

Section: Introductionmentioning

confidence: 99%

Macro–micro responses of crushable granular materials in simulated true triaxial tests

Zhou¹,

Yang²,

Ma³

et al. 2015

Granular Matter

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This paper presents simulations of true triaxial tests on crushable granular materials. Considering both the shear and tensile fracture modes of the particle, the MohrCoulomb model with tension cut-off is employed as the fracture criterion of single particle. When the particle stresses satisfy the fracture criterion, three new balls are generated to replace the broken particle. The new balls overlap enough within the bounding parent sphere to obey the mass conservation law. A polydisperse assembly consisting of 7935 spheres was isotropically compressed until the desired confining pressure was reached. Then the sample with no bias in initial fabric was subjected to axial compression at a constant minor principal stress under different intermediate principal stress ratios, b. The simulated stress-strain-dilation responses were in agreement with the experimental observations. The macro-micro responses including stress-strain characteristics, fabric tensors, anisotropies, the orientation tensor and force chain characteristics were discussed in details. It is shown that volumetric responses is affected by b. The anisotropies vary with b, but a unique macro-micro linkage exists between the anisotropies and stress ratio, q/ p, irrespective of the value of b. A linear relationship is found between the obliquity of σ 1 /σ 3 and the strength indicator (β = ln(τ 1 /τ 3 )) using the orientation tensor method.

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Assessment of test data for selection of 3-D failure criterion for sand

Cited by 71 publications

References 43 publications

Critical State–Based Interpretation of the Monotonic Behavior of Hostun Sand

Critical State–Based Interpretation of the Monotonic Behavior of Hostun Sand

Stress-Strain Degradation Response of Railway Ballast Stabilized with Geosynthetics

Macro–micro responses of crushable granular materials in simulated true triaxial tests

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