Mechanical properties of calcareous silts in a hydraulic fill island-reef

Wang, Xing; Cui, Jie; Wu, Yang; Zhu, Changqi; Wang, Xinzhi

doi:10.1080/1064119x.2020.1748775

Cited by 30 publications

(14 citation statements)

References 37 publications

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“…Rubber particles have low stiffness, strong deformation capacity, and large elasticity, and thus can easily change shape. In contrast, sand particles can be assumed to be rigid particles, especially relative to rubber particles [ 38 , 43 ]. Figure 15 presents schematic diagrams of the internal contact and force transmission chains of the various specimen types evaluated in this study.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Dynamic Shear Modulus and Damping Ratio of Sand–Rubber Mixtures under Large Strain Range

Cui

Shan

et al. 2020

Materials

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Adding rubber into sands has been found to improve the mechanical behavior of sands, including their dynamic properties. However, ambiguous and even contradictory results have been reported regarding the dynamic behavior of sand–rubber mixtures, particularly in terms of the damping ratio. A series of cyclic triaxial tests were, therefore, performed under a large range of shear strains on sand–rubber mixtures with varying rubber volume contents, rubber particle sizes, and confining pressures. The results indicate the dynamic shear modulus decreases with increasing rubber volume content and with decreasing particle size and confining pressure. The relationship of the damping ratio to the evaluated parameters is complicated and strain-dependent; at shear strains less than a critical value, the damping ratio increases with increasing rubber volume content, whereas the opposite trend is observed at greater shear strains. Furthermore, sand–rubber mixtures with different rubber particle sizes exceed the damping ratio of pure sand at different rubber volume contents. A new empirical model to predict the maximum shear moduli of mixtures with various rubber volume contents, rubber particle sizes, and confining pressures is accordingly proposed. This study provides a reference for the design of sand–rubber mixtures in engineering applications.

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Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

Dynamic Shear Modulus and Damping Ratio of Sand–Rubber Mixtures under Large Strain Range

Cui

Shan

et al. 2020

Materials

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“…This shows that different unsaturated soils have significant differences in their strength parameters depending on the ω. Additionally, most of these research results are based on terrigenous soil. Owing to the special marine organisms in coral sand, it is significantly different from terrigenous soils; it has extremely irregular particle shapes and high porosity and fragility, and is often accompanied by cementation [20], which are significantly different from terrigenous soils. Therefore, whether the above research results are applicable to coral sand remains to be discussed.…”

Section: Introductionmentioning

confidence: 99%

“…In 1988, the first international calcareous soil mechanics conference held in Perth, Australia, triggered a great upsurge in research on the mechanical properties of coral sand. At present, researchers have mainly studied coral fine-grained soil [2,20,[22][23][24], medium-coarse sand [25][26][27][28][29][30][31], and coarse-grained soil [32,33]. There are relatively few studies on the mechanical properties of coral gravelly sand [34,35], and these research results are mostly limited to the effects of density, gradation, stress state, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand

Wang

Shen

et al. 2020

JMSE

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The effect of capillary water caused by heavy rainfall and groundwater level fluctuations can induce the erosion and collapse of island reef coral sand foundations. Here, the effects of water content (ω) on the shear strength parameters of coral gravelly sand are analyzed at the macro and micro scales by laboratory consolidated-drained triaxial compression and nuclear magnetic resonance tests. Furthermore, particle breakage characteristics of coral gravelly sand under the static load are discussed. With increasing ω, (1) the internal friction angle increases slightly (<1°) then decreases; (2) the apparent cohesion is more sensitive to the change in the ω; (3) with an increase from 5.4% to 21.3%, the bound water content remains almost unchanged; (4) the capillary water content is the main factor impacting the apparent cohesion; (5) the increase in free water content is the internal cause of the decreasing internal friction angle of coral gravelly sand with ω > 11.1%; and (6) the particle breakage increases, and there is an approximately linear relationship between the median particle diameter (d50) and relative breakage index (Br). The established physical model can reflect the influence of water content and plastic work and describe the evolution law of particle breakage.

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“…Calcareous sediments characterized by unique grain morphology are widely distributed near coral reefs [1]. They are commonly adopted as a building material in offshore engineering, ranging from conventional geotechnical applications (e.g., foundations, embankments, and retaining walls) to offshore hydrocarbon industries [2][3][4][5]. Understanding the engineering properties of calcareous sand is therefore of great importance.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation of the Mechanical Properties of a Rubber–Calcareous Sand Mixture: The Effect of Rubber Content

2020

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This paper introduces a rubber–calcareous sand mixture as a lightweight building material in offshore engineering. The mechanical properties of mixtures of varying rubber contents were investigated by performing a one-dimensional (1-D) compression test in a modified oedometer cell, as well as a resonant column test. A discussion on the test results, along with detailed interpretations regarding the role of rubber chips in the mixtures, are provided. It was found that the virgin compression curves of the rubber–calcareous sand mixtures tended to converge at a certain stress level, whilst the stress level depended on the rubber content. Moreover, the relative breakage was examined by comparing the particle size distribution curves of the calcareous sand before and after the compression test. It was shown that the grain crushing of calcareous sand was less remarkable with the inclusion of rubber chips. Furthermore, the small strain shear modulus (G0) of the mixtures decreased with the rubber content, yet the modulus reduction and damping curves exhibited little difference for the specimens of varying rubber contents.

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Mechanical properties of calcareous silts in a hydraulic fill island-reef

Cited by 30 publications

References 37 publications

Dynamic Shear Modulus and Damping Ratio of Sand–Rubber Mixtures under Large Strain Range

Dynamic Shear Modulus and Damping Ratio of Sand–Rubber Mixtures under Large Strain Range

Experimental Study on the Impact of Water Content on the Strength Parameters of Coral Gravelly Sand

Laboratory Investigation of the Mechanical Properties of a Rubber–Calcareous Sand Mixture: The Effect of Rubber Content

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