The effect of shape and stiffness of originally different marine soil grains on their contractive and dilative behavior

Shahnazari, Habib; Salehzadeh, Hossein; Rezvani, Reza; Dehnavi, Yasser

doi:10.1007/s12205-014-0286-8

Cited by 37 publications

(3 citation statements)

References 12 publications

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“…As observed by Coop et al (2004), Sharma and Ismail (2006), Kim et al (2008), Shahnazari et al (2014) and Aghajani et al (2016), Shen et al (2020), and Zhang and Luo (2020), particle breakage in carbonate sands impacts their stress-strain behavior, bringing about a reduction in void ratio. The additional settlement resulting from particle crushing dominates the initial elastic compression as noted by Kim et al (2008).…”

Section: Introductionmentioning

confidence: 75%

Crushability and compressibility of carbonate and siliceous sands in the one-dimensional oedometer test

2021

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Carbonate sediments are originated from the skeletal remains of marine organisms, which are abundantly situated at the tropical and petrochemical reservoir in Australia, India, the North Sea coasts, and the Persian Gulf. The different behavior of carbonate remains in comparison to siliceous soils has attracted attention among researchers. Crushability is a significant feature of carbonate sands which leads to changes in particle size distribution at high pressures and causes enormous damage to structures. This study aims to evaluate the compressibility of Hormuz Island carbonate sand and compare it to the Chamkhaleh Beach siliceous sand through one-dimensional compression tests in a pneumatic oedometer apparatus. Experiments were subjected to overburden pressures up to 2 MPa, and grain crushing was measured after each experiment. Results illustrated that particle crushing in the Hormuz Island sand impacted its compressibility and led to an abrupt increase in strain and settlement.

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Section: Introductionmentioning

confidence: 75%

Crushability and compressibility of carbonate and siliceous sands in the one-dimensional oedometer test

2021

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“…It is found that the empirical dilatancy index for different particle sizes increases with the increasing effective confining pressure, indicating that the volumetric dilatancy behaviour is suppressed by the increasing effective confining pressures. For calcareous sand, the particle breakage has a significant influence on the volumetric behaviour (Bandini & Coop, 2011;Shahnazari et al, 2014;Shahnazari et al, 2015). It seems that both a higher effective confining pressure and a larger particle size can lead to a larger extent of particle breakage, which reduces the volumetric dilatancy Shahnazari et al, 2015).…”

Section: Effect Of Particle Size On Strain Softening and Dilatancymentioning

confidence: 99%

Experimental study on particle size effect on mechanical behaviour of dense calcareous sand

Kuang¹,

Long²,

Wang³

et al. 2020

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To investigate the effect of particle size on mechanical properties of calcareous sand, a series of consolidated drained triaxial tests were performed on calcareous sand with different particle sizes. At a low effective confining pressure of 50 kPa, the shear peak strength increases with the increasing particle size. However, under a relatively large effective confining pressure (³ 200 kPa), the shear peak strength decreases with the increasing particle size. Moreover, the apparent cohesion increases, and the corresponding friction angle decreases with the increase of particle size. The softening and dilatancy coefficient were proposed to evaluate the softening and dilatancy behaviour quantitatively. Calcareous sands with larger particle size show the greater strain hardening and volumetric contraction behaviour, which is more susceptible to the effective confining pressure.

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“…Therefore, the physical and mechanical properties of calcareous sand are significantly deviated from those of silica sand [1]. To use calcareous sand in geotechnical projects, the characterization of engineering properties of calcareous sand is very important; therefore, many researchers have evaluated the compressibility and large strain shear strength (or friction angle) of calcareous sands [1][2][3]. However, studies focusing on the small strain stiffness of calcareous sand have been very limited.…”

Section: Introductionmentioning

confidence: 99%

Maximum shear modulus of calcareous sand in Dejebel Dahar, Tunisia and its dependency on applied stress

et al. 2019

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The present experimental investigation aims at investigating the small strain stiffness of calcareous sand as a function of applied stress. The calcareous sand was sampled at Tunisia's Dejebel Dahar region, and the shear wave velocity (Vs) of calcareous sand was measured using modified oedometer cell equipped with bender elements. The results of this study demonstrate that the Vs of the tested calcareous sand is smaller than that of silica sand with minimal crushable particles at relatively low applied stress (σ); however, Vs of calcareous sand is greater than that of silica sand at high σ, reflecting strong dependency of calcareous sand on σ. The applied stress dependency of soils can be expressed as a power function of applied stress (Vs = α (σ / 1 kPa)β, where α = Vs at σ = 1 kPa and β = stress exponent). Generally, the single α-β can capture the dependency of Vs on σ, and the typical β value for sand is around 0.25. The measured β of tested silica sand was around 0.20; while, Tunisia calcareous sand shows β of greater than 0.32, and the dependency of Vs on σ cannot be captured by single α-β. This can be attributed to the fact that the variation of Vs of tested calcareous sand with increasing σ reflects not only fabric change but also particle crushing.

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The effect of shape and stiffness of originally different marine soil grains on their contractive and dilative behavior

Cited by 37 publications

References 12 publications

Crushability and compressibility of carbonate and siliceous sands in the one-dimensional oedometer test

Crushability and compressibility of carbonate and siliceous sands in the one-dimensional oedometer test

Experimental study on particle size effect on mechanical behaviour of dense calcareous sand

Maximum shear modulus of calcareous sand in Dejebel Dahar, Tunisia and its dependency on applied stress

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