Compression responses and particle breakage of calcareous granular material in reclaimed islands

Shen, Jing; Chen, Xiang; Wang, Xing; Wang, Xinzhi; Qin, Yue; Wu, Hao

doi:10.1016/j.powtec.2023.118277

Cited by 15 publications

(5 citation statements)

References 50 publications

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“…This deviation markedly behaves differently from the outcomes observed in the remaining test groups, and this discrepancy could be a ributed to the presence of substantial voids within the Dr = 0.2 specimen, resulting in a predominant point-to-point contact pa ern among the granules. Similar results were observed by Shen et al [46]. Consequently, a considerable allowance for particle movement could be considered to exist in the case of Dr = 0.2.…”

Section: Test Schemesupporting

confidence: 88%

“…This can be attributed to the prevalent point-to-point contact mode among particles when D r = 0.2. In contrast to the point-to-face and face-to-face contact modes, the point-to-point contact mode results in a smaller inter-particle contact area, leading to increased contact stress and, consequently, more pronounced fragmentation, which is consistent with the experimental results of Shen [46]. Comparatively, medium-dense and dense sands exhibit more breakage in looser sands with minor fluctuations, predominantly influenced by the morphology of the calcareous sands.…”

Section: The Effect Of Relative Densitysupporting

confidence: 86%

Section: Test Schemementioning

confidence: 99%

“…The D r of the calcareous sands varied as 0.2, 0.4, 0.6, and 0.8, while the S r of specimens were set at 0 and 100%, respectively, for a comparative analysis of the lateral mechanical response between dry sand and saturated sand [5]. Furthermore, the P e was designated as 100 kPa, 200 kPa, 400 kPa, 800 kPa, and 1600 kPa to represent the different loading amplitudes corresponding to practical coastal engineering [46]. 4 illustrates th correlation between void ratio (e) and lgP at various Dr. As shown in Figure 4a, a notabl reduction in e was observed in calcareous sands during the initial loading phase across al groups.…”

Section: Test Schemementioning

confidence: 99%

See 3 more Smart Citations

Investigation on the Confined Breakage Characteristics of Calcareous Sand in the South China Sea Integrated Using Relative Breakage Ratio and Fractal Dimension

Zhu,

Zheng,

Yang

2024

Sustainability

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Calcareous sand, ubiquitous in the geotechnical makeup of the South China Sea, exhibits both compressibility and vulnerability to fragmentation when subjected to external loading, spanning a spectrum from typical to extreme conditions. This investigation aims to quantitatively assess the compression and particle breakage characteristics of calcareous sand under varied parameters, including relative density, saturation, applied loads, and loading paths, specifically focusing on sustainable geotechnical methodologies. Through a series of confined compression tests, this evaluation employed the relative breakage ratio and fractal dimension as key evaluative metrics. The results indicated that employing this integrated approach offered a more comprehensive understanding of calcareous sand breakdown mechanisms than relying on a singular particle breakage index. Furthermore, an increase in relative density can induce a transition in particle contact behavior, shifting from point-to-point interactions to face-to-face contact, thereby reducing inter-particle stress and minimizing grain breakage, particularly under loads below 200 kPa. Increasing loads exacerbated particle breakage, with finer particles predominantly initiating this process. During reloading, pore ratios across various load levels surpass those observed during initial loading, except at 1600 kPa, where a decline in pore ratio was noted, coinciding with pore water extrusion and the onset of new particle fracturing. The lubricating effect of water reduces inter-particle friction, enhancing stress concentration at particle edges and localized particle breakage, thereby increasing the presence of finer particles without significantly altering the overall structure. Notably, the influence of pore water pressure is evident during the reloading phase. These findings contribute to a refined theoretical framework for predicting coastal erosion risks and devising effective environmental protection strategies for sustainable coastal engineering practices.

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Section: Test Schemesupporting

confidence: 88%

Section: The Effect Of Relative Densitysupporting

confidence: 86%

Section: Test Schemementioning

confidence: 99%

Section: Test Schemementioning

confidence: 99%

See 2 more Smart Citations

Investigation on the Confined Breakage Characteristics of Calcareous Sand in the South China Sea Integrated Using Relative Breakage Ratio and Fractal Dimension

Zhu,

Zheng,

Yang

2024

Sustainability

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“…The primary geomaterial for reclamation and construction, coral sand (CS), is a deposit formed from the organic remnants of entities like corals, algae, and shells eroded by seawater. CS possesses distinct characteristics such as an irregular shape, high void ratio, rough surface, and abundant internal pores [3][4][5][6][7]. Research has validated CS's exceptional mechanical properties [8][9][10], making it indispensable in island reef construction.…”

Section: Introductionmentioning

confidence: 99%

Study on Effect of Particle Size Distribution on Water-Retention Capacity of Coral Sand from Macro and Micro Perspective

Wu,

Lei,

Chen

et al. 2024

JMSE

Self Cite

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The reclamation coral sand (CS) layer is the survival environment for island reef vegetation in the South China Sea. The root system within the CS bed draws water necessary for vegetation growth, implying that the water-retention capacity of CS plays a pivotal role in determining vegetation viability. Particle size distribution (PSD) significantly influences the water-retention capacity of geomaterials. This study examines the impact of PSD on the water-retention capacity of CS from both macro (soil–water characteristic curve, SWCC) and micro (pore water distribution) perspectives using the pressure plate test and nuclear magnetic resonance technique, and an F&X model was used to analyze the SWCC of CS. The findings indicated that the F&X model aptly describes the SWCC of CS with different PSDs. Both the air entry value and residual water content rise with an increased content of fine grains (d < 0.25 mm), suggesting that the presence of fine grains augments the water-retention capacity of CS. It is considered that a size range of d = 0.075–0.25 mm predominantly impacts the water-retention capacity of CS. The PSD primarily influences the water-retention capacity by affecting the pore size distribution of CS. The volume of small pores swells with the surge of fine-grain content, while the maximum pore size contracts with increasing fine-grain content. Limited pore connectivity in CS means macropores can retain water even under high suction, bolstering the water-retention capacity of CS. These findings offer theoretical guidance for selecting gradation parameters for the planting layer on island reefs.

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Particle Breakage Prediction of Coral Sand Using Machine Learning Method

Li,

Zhou,

Wang

2024

Lecture Notes in Civil Engineering

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Compression responses and particle breakage of calcareous granular material in reclaimed islands

Cited by 15 publications

References 50 publications

Investigation on the Confined Breakage Characteristics of Calcareous Sand in the South China Sea Integrated Using Relative Breakage Ratio and Fractal Dimension

Investigation on the Confined Breakage Characteristics of Calcareous Sand in the South China Sea Integrated Using Relative Breakage Ratio and Fractal Dimension

Study on Effect of Particle Size Distribution on Water-Retention Capacity of Coral Sand from Macro and Micro Perspective

Particle Breakage Prediction of Coral Sand Using Machine Learning Method

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