Experimental Measurement of the Permeability of Calcareous Sands in the South China Sea

Yin, Wang; Ren, Yubin; Yang, Qing

doi:10.1061/9780784480151.028

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…This leads to a decrease in the effective over-water area of the seepage channel, causing an increase in seepage resistance and path. Consequently, the permeability coefficient decreases [30,31]. relatively loose skeleton.…”

Section: Permeability Test Resultsmentioning

confidence: 99%

Experimental Study on the Mechanical Strength, Deformation Behavior and Infiltration Characteristics of Coral Sand

Lv,

Wu,

Shi

et al. 2024

Sustainability

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In this investigation, coral sand is presented as a sustainable substitute for conventional river and machine-manufactured sand. This study comprehensively investigated the macro-scale strength, deformation, and permeability characteristics of coral sand, alongside analyzing the mechanical behavior, deformation, and permeability under various conditions and in relation to distinct particle characteristics. It revealed that coral sand primarily consists of biotite and high-Mg calcite, featuring abundant internal pore space. Its compressive properties resemble clayey soils, displaying minimal unloading rebound and predominant plastic deformation during compression. In direct shear tests, the stress–strain relationship follows an approximate hyperbola, with no pronounced strain softening. Describing particle fragmentation in the process proves challenging, making indicators like internal friction angle less applicable in engineering. Triaxial tests indicate a rapid initial bias stress increase, followed by a gradual decrease post-stress peak, suggesting a strain softening phenomenon. As surrounding pressure rises, the axial strain needed to reach peak strength also increases. The permeability coefficient of coral sand correlates linearly with pore ratio increase, represented by 10e. The complex interaction of multiple factors influences the strength, deformation, and permeability of coral sand blown fill mixes, with specimen porosity having the greatest impact. The design and construction of high-weight foundation elements in coral sand blown fill projects should consider porosity effects.

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Section: Permeability Test Resultsmentioning

confidence: 99%

Experimental Study on the Mechanical Strength, Deformation Behavior and Infiltration Characteristics of Coral Sand

Lv,

Wu,

Shi

et al. 2024

Sustainability

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show abstract

“…Equations ( 8) and ( 9) show that the permeability coefficient is an exponential function of C u and C c , respectively. Overall, k is roughly proportional to C u and C c [53], and most curves show a high fitting degree (R 2 > 90%). Notably, with the case of MT < 5, the curves involving C u showed a concave trend, while the curves involving C c showed a convex trend.…”

Section: Correlational Analysesmentioning

confidence: 93%

“…Thus, with sufficient MICP treatment cycles, larger C u provides more pore space for the filling of CaCO 3 crystals, thus leading to the significant reduction in pore space and lower permeability. However, larger C u may also result in a smaller size of induced CaCO 3 crystals, which tends to result in poor solidification effectiveness [53]. It is worth noting that despite the different particle gradations of the samples, the microstructure shows similar filling and coating effects on the surface of sand particles or interparticles after the MICP treatments.…”

Section: Scanning Electron Microscopy (Sem) Analysesmentioning

confidence: 96%

“…To reduce the influence of other factors, the effective particle size (d 10 ) of each sand sample was controlled to be a constant value. Therefore, d 10 was introduced into the fitting equation, based on the experience of the expression of the permeability coefficient established by some scholars [53]. The analysis results are shown in Figure 11, where MT = 1 means the MICP treatment is performed once, and so on.…”

Section: Correlational Analysesmentioning

confidence: 99%

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Experimental Study on the Permeability of Microbial-Solidified Calcareous Sand Based on MICP

Chen

2022

Applied Sciences

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In the construction of artificial islands in distant seas, calcareous sand has been widely used as a foundation filler due to its excellent mechanical properties and extensive availability in the marine environment. How to store more fresh water on the artificial islands by reducing its permeability is currently a great challenge. Microbial-induced carbonate precipitation (MICP) has always been considered as a great potential method to improve the cemented properties of calcareous sand, but the effect of grain gradation on the permeability of MICP-improved calcareous sand remains unclear. In this research, a self-made device was developed to conduct MICP grouting and permeability tests, where the permeability coefficient (k) under different grain gradations (curvature coefficient (Cc) and uniformity coefficient (Cu)) was measured. A CT scan was conducted to investigate the variation in the porosity (n) of sand samples before and after MICP treatment. The weighting method was adopted to measure the content of induced calcium carbonate (M). A scanning electron microscopy (SEM) technique was used to further study the micromechanism of the MICP treatment. Finally, the correlations between the k of MICP-treated sand and Cu, as well as Cc, were semiquantitively analyzed. The results show that the magnitude of M, k and n changes are closely related to Cc and Cu. The reduction amount of k and n increased with the rise in Cc and Cu, and the increased amount of M increased with the rise in Cc and Cu. The SEM results show that the particle surface became rough due to the coating effect of CaCO3 crystals, and the pore spaces were reduced because of the partially filling effect of the crystals, which was responsible for the decrease in permeability and porosity. Furthermore, k fitted well with Cu and Cc, respectively, and the fitting curve reveals that larger Cu (Cu ≥ 6.0) and smaller Cc (2.0 > Cc > 0.5) were more suitable for MICP treatments and lead to a large reduction in permeability. The above results indicate that the grain gradation of calcareous sand had a significant influence on its permeability improved by MICP.

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Predicting the permeability coefficient of polydispersed sand via coupled CFD–DEM simulations

Zhu

Cai

et al. 2022

Computers and Geotechnics

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Experimental Measurement of the Permeability of Calcareous Sands in the South China Sea

Cited by 4 publications

References 7 publications

Experimental Study on the Mechanical Strength, Deformation Behavior and Infiltration Characteristics of Coral Sand

Experimental Study on the Mechanical Strength, Deformation Behavior and Infiltration Characteristics of Coral Sand

Experimental Study on the Permeability of Microbial-Solidified Calcareous Sand Based on MICP

Predicting the permeability coefficient of polydispersed sand via coupled CFD–DEM simulations

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