Long-term behaviour and degradation of calcareous sand under cyclic loading

He, Shaoheng; Ding, Zhi; Tang-dai, Xia; Zhou, Wan-Huan; Gan, Xiaolu; Chen, Yong-Zhan; Xia, Fan

doi:10.1016/j.enggeo.2020.105756

Cited by 46 publications

(8 citation statements)

References 65 publications

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“…The carbonate-based sand adopted in this study was obtained from the upper layer of the coral island reef in the South China Sea, which is a good construction filler material widely used in marine reclamation projects. Through additional X-ray diffraction tests already conducted on this carbonated-based sand [2], it was found that this sand is mainly composed of aragonite and calcite, and the calcium carbonate (CaCO3) content of this sand is about 92%. The silicate sands adopted in this study were quartz sand (see Figure 1b) and glass bead (see Figure 1c) used for comparison experiments.…”

Section: Methodsmentioning

confidence: 97%

“…For example, it has been adopted as the filling material for the foundations of wharves, roads, and airport runways and in island reefs. Carbonate-based sand has more complex mechanical properties than silicate-based sand because its particle shape is more irregular [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The microstructure of soils, especially the pore-size distribution (i.e., PSD), has been extensively acknowledged to be related to mechanical properties, such as shear strength, compressibility, and water-retention ability [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Grain Size on Microscopic Pore Structure and Fractal Characteristics of Carbonate-Based Sand and Silicate-Based Sand

Ding

et al. 2021

Fractal Fract

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In this study, a series of nuclear magnetic resonance (NMR) tests was conducted on calcareous sand, quartz sand, and glass bead with a wide range of grain sizes, to understand the effect of grain size on the micro-pore structure and fractal characteristics of the carbonate-based sand and silicate-based sand. The pore size distribution (PSD) of the tested materials were obtained from the NMR T2 spectra, and fractal theory was introduced to describe the fractal properties of PSD. Results demonstrate that grain size has a significant effect on the PSD of carbonate-based sand and silicate-based sand. As grain size increases, the PSD of sands evolves from a binary structure with two peaks to a ternary structure with three peaks. The increase in the grain size can cause a remarkable increase in the maximum pore size. It is also found that the more irregular the particle shape, the better the continuity between the large and medium pores. In addition, grain size has a considerable effect on the fractal dimension of the micro-pore structure. The increase of grain size can lead to a significant increase in the heterogeneity and fractal dimension in PSD for calcareous sand, quartz sand and glass bead.

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Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Microscopic Pore Structure and Fractal Characteristics of Carbonate-Based Sand and Silicate-Based Sand

Ding

et al. 2021

Fractal Fract

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“…Researches on the creep properties of soil mainly cover creep tests and creep constitutive models. In the aspect of soil creep tests, the researches have been conducted on a variety of soils, including coarse-grained soil [2], loess [3][4][5], calcareous sand [6,7], marine soil [8], frozen soil [9][10][11][12]. Abundant literatures about creep characteristics of soft soil [13][14][15][16][17] have been reported due to its obvious creep characteristics with high moisture content and high compressibility.…”

Section: Introductionmentioning

confidence: 99%

Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model

Kong

2021

Period. Polytech. Civil Eng.

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The creep behaviors of expansive soils play an important role in landslide prediction and long-term stability analysis. In this paper, triaxial drained compression creep tests of expansive soils were conducted on the improved stress-controlled triaxial apparatus. The test results show that only transient deformation and attenuation creep occur with low deviator stress, and the increment of axial strain increases exponentially with deviator stress increasing; while deviator stress reaches a certain value, attenuation creep, steady creep and accelerated creep all occur in a creep curve. Meanwhile, the volumetric strain presents the shear shrinkage characteristic at the initial stage of loading, and the shear shrinkage is small. With the extension of loading time, the volumetric strain gradually varies from shear contraction to dilatancy. When entering the accelerated creep stage, the development rate of volumetric strain increases sharply. Besides, isochronous stress-strain curves of expansive soils indicate that their creep process possesses nonlinear characteristics, and the nonlinear degree is related to creep time and stress level. Imitating the empirical formula of cyclic cumulative deformation of clay, a new nonlinear creep model is presented, which may well describe the creep property of expansive soils. Furthermore, critical failure stress could be obtained based on the proposed creep model. The ratio of the critical failure stress to conventional shear failure stress ranges from 70% to 80%, with average of 75.56%, therefore, critical failure stress may be estimated by conventional triaxial tests with the margin of error 5.5% within.

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“…Seismic damages in Guam (1993), Hawaii (2006), and Haiti (2010 have demonstrated the significance of studying these deposits. The cyclic behavior of calcareous deposits has been studied by Hyodd et al (1998), Nanda et al (2018), Shahnazari et al (2019), He et al (2020), andRezvani et al (2020), among others. Moreover, many researchers, including Yasufuku and Hyde (1995), Kuwajima et al (2009), andWu et al (2013), have investigated the influence of these soils on the bearing capacity of piles.…”

Section: Introductionmentioning

confidence: 99%

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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Long-term behaviour and degradation of calcareous sand under cyclic loading

Cited by 46 publications

References 65 publications

Effect of Grain Size on Microscopic Pore Structure and Fractal Characteristics of Carbonate-Based Sand and Silicate-Based Sand

Effect of Grain Size on Microscopic Pore Structure and Fractal Characteristics of Carbonate-Based Sand and Silicate-Based Sand

Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model

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

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