Strength and deformation characteristics of a locked sand at low effective stresses

Bhandari, A. R.; Powrie, W.

doi:10.1007/s10035-013-0426-8

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…Recently, the effect of bonding on the mechanical behavior of bonded sands has been widely investigated by testing natural sands . Nevertheless, the sampling process will inevitably disturb the original micro‐structure of natural samples, leading to reduced strength and stiffness .…”

Section: Introductionmentioning

confidence: 99%

“…Copyright that bonded sands are widely distributed in nature and their mechanical behavior is controlled not only by density and stress history, but also by the inter-particle bonding not being described by classical geo-mechanics [3]. Hence, it is very important to take into account the bonding effect when studying the mechanical behavior of bonded sands.Recently, the effect of bonding on the mechanical behavior of bonded sands has been widely investigated by testing natural sands [4,5,[9][10][11][12][13][14][15]. Nevertheless, the sampling process will inevitably disturb the original micro-structure of natural samples, leading to reduced strength and stiffness [16,17].…”

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confidence: 99%

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A simple three‐dimensional distinct element modeling of the mechanical behavior of bonded sands

Jiang

Zhang

Thornton

2015

Num Anal Meth Geomechanics

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Summary This paper presents a simple three‐dimensional (3D) Distinct Element Method (DEM) for numerical simulation of the mechanical behavior of bonded sands. First, a series of micro‐mechanical tests on a pair of aluminum rods glued together by cement with different bond sizes were performed to obtain the contact mechanical responses of ideally bonded granular material. Second, a 3D bond contact model, which takes into account the influences of bond sizes, was established by extending the obtained 2D experimental results to 3D case. Then, a DEM incorporating the new contact model was employed to perform a set of drained triaxial compression tests on the DEM bonded specimens with different cement contents under different confining pressures. Finally, the mechanical behavior of the bonded specimens was compared with the available experimental results. The results show that the DEM incorporating the simple 3D bond contact model is able to capture the main mechanical behavior of bonded sands. The bonded specimen with higher cement content under lower confining pressure exhibits more pronounced strain softening and shear dilatancy. The peak and residual strengths, the apparent cohesion and peak/residual friction angles, and the position and slope of the critical state line increase with increase in cement content. Microscopically, bond breakage starts when the system starts to dilate and the maximum rate of bond breakage coincides with the maximum rate of dilation. Bond breakage is primarily due to tension‐shear failure and the percentage of such failures is independent of both confining pressure and cement content. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

A simple three‐dimensional distinct element modeling of the mechanical behavior of bonded sands

Jiang

Zhang

Thornton

2015

Num Anal Meth Geomechanics

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“…The shear strength of soil depends upon many factors such as soil type or formation cause (Guo 2008;Ramamurthy 2001), structure characteristic (Hattamleh et al 2007;Sazzad and Suzuki 2013), mineral composition or rock type of particle (Guo and Su 2007;Sadrekarimi and Olson 2010b), compactness (Härtl and Ooi 2008;Sazzad and Suzuki 2013;Wang et al 2014;Zhuang et al 2014), particle size (Bayat and Bayat 2013;Thevanayagam 1998), particle shape (Cécile 2010;Zhuang et al 2014), and environmental condition (water content, seepage, and stress state) (Bhandari and Powrie 2013;McDougall et al 2013;Sivathayalan and Vaid 1998;Sun et al 2014;Wang and Ni 2013;Zhang et al 2014). In the substance composition, the coarse granular soil is a mixture of different parent mineral particles, and its particle diameters range from 0.075 to 60 mm according to the definition of the soil mechanics (Terzaghi et al 1996).…”

Section: Introductionmentioning

confidence: 96%

Scale dependence of shear strength for a coarse granular soil using a superimposition-nest type of direct shear apparatus

Dai

2015

Arab J Geosci

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This study applies a modified superimposition-nest type of direct shear apparatus (DSA) to exploring the scale dependence of shear strength from the direct shear test (DST) of soil. The modified apparatus enables the variation of the diameter D and height H of specimens and can adjust the gap T between the upper and lower shear box halves. The DSTs in different combinations of T, D, and H were conducted under a constant vertical normal stress σ for a coarse granular soil. In each combination situation, five sets of tests were performed in parallel under the same σ value to validate the reproducibility and reliability of testing. The gap effect results show the influence of T on the failure shear stress τ f . The diameter and height effect results reveal the dependence of τ f on the D and H of specimen.The reasonable values of T, D, and H relative to the maximum particle diameter d max of the soil are evaluated for the coarse granular soil as well as the reasonable shear strength envelopes.

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Particle loss: An initial investigation into size effects and stress-dilatancy

McDougall

Kelly

Barreto

2019

Soils and Foundations

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Strength and deformation characteristics of a locked sand at low effective stresses

Cited by 4 publications

References 40 publications

A simple three‐dimensional distinct element modeling of the mechanical behavior of bonded sands

A simple three‐dimensional distinct element modeling of the mechanical behavior of bonded sands

Scale dependence of shear strength for a coarse granular soil using a superimposition-nest type of direct shear apparatus

Particle loss: An initial investigation into size effects and stress-dilatancy

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