3D quantitative characterization and flow simulation of granite residual soil based on CT scanning

Cai, Peichen; Que, Yun; Jiang, Zhenliang; Li, Xian

doi:10.1360/sst-2021-0308

Cited by 6 publications

(2 citation statements)

References 28 publications

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“…Currently, the integration of non-destructive X-ray CT scanning and image processing technologies facilitates the extraction of quantitative attributes of soil pore structure without destroying the original soil structure and is regarded as one of the most effective non-destructive methods [37][38][39][40]. This advancement plays a pivotal role in constructing accurate pore models of authentic soil samples, offering significant insights into the physical characteristics of the soil pore structure [41].…”

Section: Introductionmentioning

confidence: 99%

Simulating Two-Phase Seepage in Undisturbed Soil Based on Lattice Boltzmann Method and X-ray Computed Tomography Images

Jiang,

Lin,

Chen

et al. 2024

Sensors

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The two-phase seepage fluid (i.e., air and water) behaviors in undisturbed granite residual soil (U-GRS) have not been comprehensively studied due to a lack of accurate and representative models of its internal pore structure. By leveraging X-ray computed tomography (CT) along with the lattice Boltzmann method (LBM) enhanced by the Shan–Chen model, this study simulates the impact of internal pore characteristics of U-GRS on the water–gas two-phase seepage flow behaviors. Our findings reveal that the fluid demonstrates a preference for larger and straighter channels for seepage, and as seepage progresses, the volume fraction of the water/gas phases exhibits an initial increase/decrease trend, eventually stabilizing. The results show the dependence of two-phase seepage velocity on porosity, while the local seepage velocity is influenced by the distribution and complexity of the pore structure. This emphasizes the need to consider pore distribution and connectivity when studying two-phase flow in undisturbed soil. It is observed that the residual gas phase persists within the pore space, primarily localized at the pore margins and dead spaces. Furthermore, the study identifies that hydrophobic walls repel adjacent fluids, thereby accelerating fluid movement, whereas hydrophilic walls attract fluids, inducing a viscous effect that decelerates fluid flow. Consequently, the two-phase flow rate is found to increase with then-enhanced hydrophobicity. The apex of the water-phase volume fraction is observed under hydrophobic wall conditions, reaching up to 96.40%, with the residual gas-phase constituting 3.60%. The hydrophilic wall retains more residual gas-phase volume fraction than the neutral wall, followed by the hydrophobic wall. Conclusively, the investigations using X-ray CT and LBM demonstrate that the pore structure characteristics and the wettability of the pore walls significantly influence the two-phase seepage process.

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Section: Introductionmentioning

confidence: 99%

Simulating Two-Phase Seepage in Undisturbed Soil Based on Lattice Boltzmann Method and X-ray Computed Tomography Images

Jiang,

Lin,

Chen

et al. 2024

Sensors

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“…In the world, granite residual soil is widely distributed. With the rapid development of the transportation industry, in railway and highway construction projects, in order to ensure the stability of the route, some granite residual soil is often excavated, thus forming a large number of cut-slope projects [1][2][3]. Granite residual soil has good compressive strength, but its cohesion is poor.…”

Section: Introductionmentioning

confidence: 99%

Study on the Seepage Mechanism of Rainwater on Granite Residual Soil Cut Slopes

Guo

Zhang

et al. 2023

Advances in Civil Engineering

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In order to study the seepage process of rainwater on granite residual soil cut slopes, a numerical model for seepage analysis of granite residual soil cut slopes was established. Then, by applying the rainfall boundary condition, the seepage path of rainwater on the slope was analyzed under the condition of rainfall infiltration. Finally, during rainwater seepage, the volumetric water content and pore-water pressure change characteristics inside the slope were analyzed, and the seepage mechanism of rainwater in the granite residual soil slope was revealed. The results show that, under the condition of rainfall infiltration, the surface area of the slope gradually forms a saturated area in a temporary stable state. As the saturated area in the temporary stable state gradually extends to the inside of the slope, the area gradually increases and a groundwater level recharge area is gradually formed at the foot of the slope. Rainwater infiltration changes the original stable state of the slope, causing the granite residual soil slope to change from the two original distribution states of the unsaturated area and saturated area to the three distribution states of the temporarily stable saturated area, unsaturated area, and saturated area from top to bottom. The volumetric moisture content of slope-monitoring points increased gradually with an increase in the duration, and the overall distribution showed an “S” shape. The infiltration of rainwater causes the pore-water pressure of the granite residual soil to increase gradually, and matric suction gradually disappears. In particular, the disappearance of the matric suction at the foot of the slope will lead to the gradual weakening of the shear strength of the slope soil, thus affecting the slope stability.

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Pore-scale permeability estimation of undisturbed granite residual soil: A comparison study by different methods

Que,

Chen,

Jiang

et al. 2024

J Soils Sediments

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3D quantitative characterization and flow simulation of granite residual soil based on CT scanning

Cited by 6 publications

References 28 publications

Simulating Two-Phase Seepage in Undisturbed Soil Based on Lattice Boltzmann Method and X-ray Computed Tomography Images

Simulating Two-Phase Seepage in Undisturbed Soil Based on Lattice Boltzmann Method and X-ray Computed Tomography Images

Study on the Seepage Mechanism of Rainwater on Granite Residual Soil Cut Slopes

Pore-scale permeability estimation of undisturbed granite residual soil: A comparison study by different methods

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