Microanisotropy and preferred orientation of grains and aggregates (POGA) of the Malan loess in Yan’an, China: a profile study

Li, Xian; Hong, Bo; Wang, Li; Li, Lincui; Sun, Jianqiang

doi:10.1007/s10064-019-01674-0

Cited by 19 publications

(2 citation statements)

References 69 publications

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“…The directionality of particles has a significant effect on the permeability of soil [52]. To characterize the particle orientation of each soil layer sample, the IPP6.0 software was used for microscopic image processing.…”

Section: The Influence Of Particle Orientation On Permeability Anisot...mentioning

confidence: 99%

Anisotropy Study on the Process of Soil Permeability and Consolidation in Reclamation Areas: A Case Study of Chongming East Shoal in Shanghai

Yao,

Wang,

et al. 2023

Buildings

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Anisotropic permeability is of great significance for assessing the consolidation and drainage mode of soil layers in reclamation areas, as well as for preventing and controlling ground settlement after project construction. This paper analyzes the anisotropic permeability of the inland and nearshore soil layers in Chongming East Shoal, Shanghai, and the formation mechanism of anisotropic permeability through permeability and scanning electron microscope (SEM) tests. The results highlight that compared with dredger fill and sandy silt, the horizontal permeability coefficient of underlying soft clay (USC) is significantly higher than its vertical permeability coefficient, which is more significant in nearshore USC. Interestingly, the upper clay (21.5 m) in the thickest clay layer shows greater anisotropic permeability than the lower clay (41.5 m). Due to the instability of seepage channels, the USC anisotropic permeability increases in a fluctuating manner as the hydraulic gradient increases. Microstructural parameters are used to reveal the mechanism of anisotropic permeability, which shows that a simple soil skeleton and structure, strong particle orientation, decreased particle abundance, increased particle roundness, decreased particle contact area, and increased pore area all contribute to the enhancement of permeability. Moreover, micro-parameters have been proposed to evaluate anisotropic permeability in terms of the effective seepage-pore area. This approach addresses the constraint of water films on the permeability efficiency of USC particles.

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Section: The Influence Of Particle Orientation On Permeability Anisot...mentioning

confidence: 99%

Anisotropy Study on the Process of Soil Permeability and Consolidation in Reclamation Areas: A Case Study of Chongming East Shoal in Shanghai

Yao,

Wang,

et al. 2023

Buildings

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“…The perimeter is the length of the red contour, and the pore area is the white area inside the red contour (Figure 12). This index can better reflect the plane shape characteristics of the pore; the larger the roundness value is, the closer the pore is to the circle [55]. (4) Fractal dimension: it is used to describe the fractal characteristics of the pores, and it reflects the irregularity of the contact boundary between the pores and the solid particles in loess [56].…”

Section: Correlation Analysis Of the Macro And Micro Characteristics ...mentioning

confidence: 99%

Static Liquefaction Capacity of Saturated Undisturbed Loess in South Jingyang Platform

Yan

Peng

Zhang

et al. 2020

Water

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According to a previous geological investigation, high-speed and long-distance loess landslides in the South Jingyang platform in Shaanxi Province are closely related to the static liquefaction of loess. Considering the typical loess landslides in this area, isotropic consolidated undrained (ICU) triaxial tests and scanning electron microscopy analyses were conducted in this study. The main conclusions are as follows: (1) The stress-strain curves indicate strong strain softening under different confining pressures. The pore water pressure increases significantly and then remains at a high level; (2) The liquefaction potential index (LPI) shows an increasing trend followed by stabilization; the larger the LPI is, the smaller the state parameter (Ψ) is. The steady-state points of the loess are in the instability region; however, the steady-state strength is not zero; (3) Based on the ICU test results, the average pore diameter decreases; the shape ratio remains essentially unchanged; and the fractal dimension and roundness show different trends. The proportions of the macropore and mesopore decrease; that of the small pore increases slightly; and that of the micropore increases significantly; (4) The compression deformation of the highly spaced pores causes rapid strain hardening. A rapid strain softening results from the pore throat blockage at the beginning of particle rearrangement and reorganization. A stable strain softening is related to the agglomeration blocking of the reconstructed pore throat in the gradually stable stage of particle rearrangement and reorganization.

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3D scanning-based morphological characterization of rammed layer interfaces: a case study of the Ming Great Wall in northwestern China

Zhang

Chen

et al. 2022

Bull Eng Geol Environ

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Microanisotropy and preferred orientation of grains and aggregates (POGA) of the Malan loess in Yan’an, China: a profile study

Cited by 19 publications

References 69 publications

Anisotropy Study on the Process of Soil Permeability and Consolidation in Reclamation Areas: A Case Study of Chongming East Shoal in Shanghai

Anisotropy Study on the Process of Soil Permeability and Consolidation in Reclamation Areas: A Case Study of Chongming East Shoal in Shanghai

Static Liquefaction Capacity of Saturated Undisturbed Loess in South Jingyang Platform

3D scanning-based morphological characterization of rammed layer interfaces: a case study of the Ming Great Wall in northwestern China

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