Evaluation of Structural Strength and Parameters of Collapsible Loess

Lei, Pan; Jun-gao, Zhu

doi:10.1061/(asce)gm.1943-5622.0001978

Cited by 20 publications

(7 citation statements)

References 22 publications

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“…Collapsibility and structural behavior are the most commonly mentioned in loess, including the relationship between them (Haeri et al, 2014;Pan et al, 2021). Collapsibility mainly is caused by diverse loess structural peculiarities in different regions .…”

Section: Discussionmentioning

confidence: 99%

“…The microstructures of undamaged loess and compacted loess can be compared to better understand their differences in collapse behavior. For example, Pan et al, (2021) examined the collapse coefficients of intact and remolded loess in Xinjiang Province, China, and characterized the link between loess structure and collapse by using the integral of collapse potential as a structural parameter. This is an excellent sample to examine the relationship between the structure of loess and its apparent water-sensitive qualities from the macroscopically mechanical view.…”

Section: Introductionmentioning

confidence: 99%

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Change in Microstructure and Fractal Characteristics of Intact and Compacted Loess due to its Collapsibility

Zhang,

Shao,

Shao

et al. 2023

Preprint

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This work aimed to examine the fractal dimension and difference law of intact and compacted loess before and after collapse. The uniaxial compression tests were performed to obtain specimens under different vertical stresses, and mercury intrusion porosimetry (MIP) tests were conducted to determine the pore size distribution (PSD). Three models were selected to determine the fractal dimensions based on PSD. As a result, the pores were classified into ultra-micropores (d < 0.1 µm), micropores (0.1 µm < d < 2 µm), small pores (2 µm < d < 10 µm), and large pores (d > 10 µm). When the fractal dimensions were determined using the capillary pressure model, there were three fractal intervals (Ds1, Ds2, and Ds3), with only Ds1 and Ds2 meeting the definition of fractal dimension. Ds1 increased considerably after the collapse, but Ds2 declined. The thermodynamic law-based model presented the best linear fit, and there was only one fractal interval. The fractal dimension Dn increased dramatically after the specimen was wet collapsed. Combined with fractal theory, it revealed that collapse changed the pore uniformity and complexity of the loess. After collapse, the microscopic pores of the loess became coarser and more complicated.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Change in Microstructure and Fractal Characteristics of Intact and Compacted Loess due to its Collapsibility

Zhang,

Shao,

Shao

et al. 2023

Preprint

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show abstract

“…Loess has high silt content, low natural water content, high porosity, low natural tensile strength, and readily collapses when exposed to water. It is easy to produce a differential settlement, cracking, and collapse when directly used as engineering filler, making it challenging to meet actual construction requirements 1 , 2 . As one of the three significant soil strengths, tensile strength is often neglected because of soil’s relatively weak tensile resistance.…”

Section: Introductionmentioning

confidence: 99%

Splitting tensile strength and microstructure of xanthan gum-treated loess

Jiang

Zhao

Zhang

2022

Sci Rep

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The tensile strength of loess is closely related to geological disasters. As eco-friendly materials, biopolymers have an excellent strengthening effect on the mechanical properties of soil. The effect of different initial dry densities and xanthan gum (XG) contents on the microstructure and mechanical behavior of XG-treated loess was studied with a series of microscopic tests and splitting tensile tests based on the particle image velocimetry technique. The results show that the XG became concentrated and agglomerated during dehydration, forming bridge links between soil particles and covering their surfaces. The XG-treated loess had a significant concentration of micropores and mesopores, with greater peak pore size distribution values than untreated loess. The specimens’ load–displacement curves with different XG contents and initial dry densities showed strain-softening. The displacement vector field indicated that specimens’ primary cracks were radial–vertical, and the secondary cracks were well-developed. The strain-softening phenomenon was more significant with increased XG content and initial dry density, and the specimens’ splitting tensile strength and brittleness increased. XG treatment gave the soils stronger cementation and a denser structure, helping to increase strength and brittleness. This research provides a scientific basis and practical experience for applying XG in geotechnical engineering.

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“…e structure of loess not only affects the soil strength but also is closely related to the collapsibility of loess. Pan et al [2] found that the collapsibility curve of loess can be divided into three stages. is research result provides a new idea and method for the description of structural parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of Soil Structure Index on Loess Permeability

Ren

Wang

Wentong

2022

Advances in Materials Science and Engineering

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In order to study the effects of dry density and initial water content on the permeability characteristics of loess, the saturated permeability tests of undisturbed loess and remolded loess were carried out in Lanzhou New Area. The anisotropy of undisturbed loess under two factors is analyzed and compared, and the permeability difference between undisturbed loess and remolded loess is also analyzed. The results show that the structure of loess has an important impact on the permeability characteristics, and the dry density is an important structural parameter. The natural structure of undisturbed loess has obvious anisotropy. Under different pore conditions and water contents, it will show the anisotropic behavior of permeability. The influence of water content on permeability is mainly reflected in the influence on the properties of cement between soil particle skeletons. Under different dry density conditions, the influence of water content on permeability is different. When the pore structure is relatively compact, the influence of water content is more obvious. In practical engineering, these two factors need to be comprehensively considered in order to accurately describe the permeability distribution of loess. This study can provide some theoretical guidance for the construction of relevant loess projects.

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Evaluation of Structural Strength and Parameters of Collapsible Loess

Cited by 20 publications

References 22 publications

Change in Microstructure and Fractal Characteristics of Intact and Compacted Loess due to its Collapsibility

Change in Microstructure and Fractal Characteristics of Intact and Compacted Loess due to its Collapsibility

Splitting tensile strength and microstructure of xanthan gum-treated loess

Experimental Study on the Influence of Soil Structure Index on Loess Permeability

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