Collapsibility, composition, and microfabric of the coastal zone loess around the Bohai Sea, China

Zhang, Weipeng; Sun, Yongfu; Chen, Wenwu; Song, Yupeng; Zhang, Jingke

doi:10.1016/j.enggeo.2019.05.019

Cited by 33 publications

(12 citation statements)

References 20 publications

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“…The 3D model and slices images obtained from CT scanning can clearly be used to characterize the microstructure of a sample, especially the pore size and its distribution [24,25]. Hence, the mathematical relationship between the CT image parameters and the pore index can be established through the analysis of pore volume.…”

Section: Computerized Tomography (Ct) Scanningmentioning

confidence: 99%

“…Defined as a combination of soil fabric and interparticle bonding [21,22], the soil structure is essentially a kind of physical property. Hence, it is usually associated with the complex mechanical or physical behavior of soil fabric [23], such as pore size [24] and distribution [25] and aggregate arrangement [26,27]. However, such work cannot be used to directly obtain or characterize the structural strength of soil, which reflects the bonding energy between soil aggregates or units [1,23].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Method for Obtaining the Loess Structural Index from Computed Tomography Images: A Case Study from the Lvliang Mountains of the Loess Plateau (China)

Tang

Guo

et al. 2021

Land

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The structural index is an important quantitative parameter for revealing the structural properties of loess. However, there is no a widely accepted measurement method for structural index at present. This study aims at presenting a novel method for obtaining the loess structural index (LSI), based on the application of computed tomography (CT) scanning techniques and laboratory physico-mechanical tests. The mountainous area of Lvliang in northwest China was taken as the study area, and Late Pleistocene loess samples were taken from various sites in the region. Several physical parameters were first measured using laboratory tests, including dry density, pore ratio, and liquidity index. CT scanning was used to observe sample microstructures, and a mathematical relationship was established between CT image parameters and the physical property indices, through three dimensions (3D) reconstruction and slice porosity analysis. The results revealed that LSI can be expressed as a non-linear function related to CT image parameters, dry density, and the liquidity index of the loess. Compared with traditional calculation methods, this novel technique calculates the LSI by using an empirical formula, which is less labor-intensive. Such results indicate that the method warrants wide application in the future.

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Section: Computerized Tomography (Ct) Scanningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Method for Obtaining the Loess Structural Index from Computed Tomography Images: A Case Study from the Lvliang Mountains of the Loess Plateau (China)

Tang

Guo

et al. 2021

Land

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“…The permeability difference is reflected in two aspects: anisotropy and difference between loess and paleosol. The anisotropy of pore structure is the original anisotropy caused by natural soil properties and the deposition environment, which is the essential cause of soil permeability anisotropy Zhang et al, 2019). The horizontal direction Note: C 0 is the nugget value, C 0 + C is the sill value, C 0 /C 0 + C is the spatial heterogeneity ratio, A is the variable range and R 2 is the goodness of fit.…”

Section: Explanation Of Microstructurementioning

confidence: 99%

“…Loess, as a type of porous and weakly cemented Quaternary sediment, had complex particle distribution, arrangement and contact modes (Gargiulo et al, 2013;Scarciglia et al, 2003;Zhang et al, 2019). The loess structural characteristics in the natural state are the product of the deposition and development, which directly affect loess permeability (Wang et al, 2018;Zhao et al, 2015).…”

Section: Establishment Of Empirical Formulamentioning

confidence: 99%

Seepage mechanisms and permeability differences between loess and paleosols in the critical zone of the Loess Plateau

Hou

Qian

Zhang

et al. 2021

Earth Surf Processes Landf

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The soil in the Loess Plateau has special permeability characteristics due to the alternating distribution of loess and paleosol layers. Using an analysis of the physical properties, microstructure and thermogravimetric analysis of loess and paleosol, this paper examines strata seepage mechanisms in the loess tableland area and considers the applicability of a hydraulic conductivity empirical formula. The analysis shows that hydraulic conductivity attenuation with depth can be represented by a negative exponential model, while hydraulic conductivity values are not normally distributed. The best-fitting models of hydraulic conductivity in the horizontal (K H ) and vertical (K V ) directions are Gaussian models, and both have strong spatial correlations. This study

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“…Studies on rock pore structures and damage have adopted a variety of advanced testing techniques, such as mercury injection testing [14,15], scanning electron microscopy (SEM) [16][17][18], computerized tomography (CT) [19][20][21][22][23], and NMR [24][25][26][27]. Each has its own advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

NMR Experimental Study on Dynamic Process of Pore Structure and Damage Mechanism of Sandstones with Different Grain Sizes under Acid Erosion

Wang

et al. 2020

Shock and Vibration

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In many engineering projects, it is critical to consider the acid erosion of rock. This study investigates dynamic changes in pore structure and damage mechanisms in sandstones subjected to acid erosion. Specimens with three grain sizes were immersed in acid solution and tested by the nuclear magnetic resonance technique. Changes in solution pH, specimen mass and porosity, T2 spectrum distribution, and area were analyzed. Damage mechanisms are discussed, and relationships between porosity and acid erosion damage variables are established. The results show that acid erosion has significant effects on pore structure and erosion damage in sandstone. With increasing soaking time, new micropores formed in sandstone, while existing micropores and mesopores gradually expanded into macropores, causing the T2 spectrum distributions to change greatly. The porosity, acid erosion damage, and T2 spectral areas of sandstones with different grain sizes all increased gradually. Under acid erosion, sandstones became gradually weakened, but the effects varied greatly according to grain size. Pore structure changes and acid erosion damage were greatest in coarse-grained sandstone, followed by medium- and fine-grained sandstone.

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Collapsibility, composition, and microfabric of the coastal zone loess around the Bohai Sea, China

Cited by 33 publications

References 20 publications

A Novel Method for Obtaining the Loess Structural Index from Computed Tomography Images: A Case Study from the Lvliang Mountains of the Loess Plateau (China)

A Novel Method for Obtaining the Loess Structural Index from Computed Tomography Images: A Case Study from the Lvliang Mountains of the Loess Plateau (China)

Seepage mechanisms and permeability differences between loess and paleosols in the critical zone of the Loess Plateau

NMR Experimental Study on Dynamic Process of Pore Structure and Damage Mechanism of Sandstones with Different Grain Sizes under Acid Erosion

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