Undrained Cyclic and Monotonic Behavior of Hormuz Calcareous Sand Using Hollow Cylinder Simple Shear Tests

Shahnazari, Habib; Jafarian, Yaser; Tutunchian, Mohammad Amin; Rezvani, Reza

doi:10.1007/s40999-016-0021-6

Cited by 52 publications

(7 citation statements)

References 20 publications

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“…However, the calcareous sand samples have a high apparent cohesion which decreases with the decreasing particle size. As calcareous sands consist of corals, shells, and alga, the particle shapes are columnar, dendritic, honeycomb, or sheet (Shahnazari et al, 2016;. Therefore, grain interlocking between coarse particles behaves as apparent cohesion in shearing.…”

Section: Effect Of Particle Size On Apparent Cohesion and Friction Anglementioning

confidence: 99%

“…Calcareous sand, which is primarily composed of remains of coral and snail, is largely located in tropical or subtropical areas around the world, such as South China Sea, Red Sea, the Hormuz Island and the Persian Gulf (Coop et al, 2004;Morsy et al, 2019;Shahnazari et al, 2016;Suescun-Florez & Iskander, 2017;Wang and Jiao, 2011). In ocean geotechnical engineering, calcareous sands are commonly used as the backfill material for road embankments or airport runways (Wang et al, 2011;Xiao et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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

Kuang¹,

Long²,

Wang³

et al. 2020

S&R

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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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Section: Effect Of Particle Size On Apparent Cohesion and Friction Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Kuang¹,

Long²,

Wang³

et al. 2020

S&R

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show abstract

“…e calcareous sands possess an intrapore structure, angular shape, and a rough surface. e calcareous sands are liable to be damaged at normal working stress [1][2][3][4]. us, calcareous sediments exhibit di erent mechanical response compared to the terrigenous sand.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mean Grain Size on the Small‐Strain Dynamic Properties of Calcareous Sand

Wen

2022

Advances in Civil Engineering

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Calcareous sand was selected as the prior material for island reclamation in many coastal regions. The mechanical properties of the granular materials are greatly affected by their grain size distribution conditions. The shear modulus and damping ratio are two important parameters for earthquake ground response analysis and liquefaction evaluation. A series of resonant column tests had been performed on calcareous sands with varying median grain diameter and uniform coefficient. The dependence of the shear modulus and damping ratio of the calcareous sand on grain size has been confirmed in this examination. The test results reveal that the shear modulus decreases with a rise in shear strain for calcareous sand samples at a given confining pressure and relative density. The maximum shear modulus tends to increase with confining pressure and relative density. On the maximum shear modulus and void ratio plane, the trend lines of the measured results shift toward up and right position with a rise in grain diameter. The measured results indicate that the influence of uniform coefficient on the maximum shear modulus is neglectable. A revised empirical equation based on the Hardin model had been proposed considering the influence of grain diameter to estimate the maximum shear modulus of calcareous sand. The predicted values show satisfactory agreement with the measured results. The results manifest that the effect of grading condition on small-strain dynamic properties of calcareous sands cannot be neglected for the evaluation of seismic safety for reclamation engineering sites.

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“…In the 1960s and 1970s, the engineering properties of calcareous sand have received global focus at both the academic and the practical levels [4,5]. After that, the basic engineering properties of calcareous sand have been paid more attention to studies [6]. The compressive properties of calcareous sand are similar to nanoclay, which is significantly affected by the particle breakage [7].…”

Section: Introductionmentioning

confidence: 99%

Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement

Wang

Jian

2021

Geofluids

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Calcareous sand is developed by the fracture of marine biological skeleton under the impact of seawater. Calcareous sand is not transported in the process of deposition. Therefore, calcareous sand retains the characteristics of marine biological skeleton, low strength, and porous. In order to study the effect of nanoclay and cement on the modification of calcareous sand, a series of tests were carried out on the modified cement calcareous sand (CCS) with different content of nanoclay. In this study, the triaxial mechanical properties and failure modes of nanoclay and cement composite modified calcareous sand (NCCS) were studied through the triaxial UU test. Then, SEM tests were carried out on CCS and NCCS samples, and the micromechanism of nanoclay and cement composite modified Nanhai calcareous sand was analyzed. The results showed that (1) the shear properties of CCS could be improved by adding nanoclay. The optimum admixture ratio of nanoclay was 8%, and its peak stress was 23%-39% higher than that of CCS. (2) The peak stress and strain of NCCS showed a linear correlation. (3) Compared with CCS, the internal friction angle and cohesion of NCCS were increased by 5.2% and 52%, respectively. (4) Nanoclay could improve the compactness and structure of cement calcareous sand, and the macroscopic performance is the improvement of peak stress and cohesion.

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Undrained Cyclic and Monotonic Behavior of Hormuz Calcareous Sand Using Hollow Cylinder Simple Shear Tests

Cited by 52 publications

References 20 publications

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

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

Effect of Mean Grain Size on the Small‐Strain Dynamic Properties of Calcareous Sand

Triaxial Mechanical Properties and Micromechanism of Calcareous Sand Modified by Nanoclay and Cement

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