Effect of conglomeration gradation on loess shear strength with different water content

Kong, Dequan; Wan, Rong; Zhao, Chenkai; Dai, Jiumei; Dong, Tijian; Ni, Weiheng; Gao, Junfeng; Wang, Tianchen

doi:10.1177/00368504211010581

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…de Dios Herrero et al (2020) revealed the relationship between the collapse index and PSD, with the letter increasing with uniform coefficient C U . Furthermore, Kong et al (2021) proved that the effect of sand PSD on shear strength decreases as the water content increases. The rheology, soil–water properties and other hydraulic characteristics of loess are also reported to be affected by changes in the PSD (Bai et al, 2020; Huang et al, 2015; Qiao et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A new method for determining loess particle size distribution based on ‘core + clothes’ structure

Zhou

et al. 2023

Earth Surf Processes Landf

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The particle size distribution (PSD) of loess particles and agglomerates is the key factor determining the microstructure of loess. The PSD largely determines many physical and mechanical properties such as mechanical strength, deformation characteristics and permeability of loess. In this paper, we combined image processing, geometric measurements and statistical methods to quantitatively characterize the scanning electron microscopy (SEM) images of loess. A new method based on the ‘core + clothes’ structure is proposed to determine the PSD. The developed Gaussian mixture model is applicable to describe the overall distribution of the image pixel density. Determining pixel density distribution and particle boundary allows for the measurement of various geometric parameters. The comparison analyses suggest that the sieve‐hydrometer method has a well‐developed test procedure; however, the measured particle size is limited to 0.075 mm. The laser diffraction method is simple and fast, yet only weak agglomerates can be dispersed, and very fine particles are influenced by size data conversion theory and light source parameters. X‐ray microtomography has the advantage of a non‐destructive sample preparation and intuitive process. However, the results are greatly affected by the parameter settings and segmentation algorithm, and the segmentation effect is poor for particles with a size smaller than 12 μm. The new image processing technique developed in this study improves the limitation of the measurement results via changes in the loess state (water content, stress level). Moreover, different PSDs can be determined according to the variation of functional units. This work is of great significance for the study of numerous properties related to the loess state.

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Section: Introductionmentioning

confidence: 99%

A new method for determining loess particle size distribution based on ‘core + clothes’ structure

Zhou

et al. 2023

Earth Surf Processes Landf

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“…The internal friction angle of loess decreases with increasing water content (Luo et al, 2014;Wang et al, 2014;Zhou et al, 2018a;Tian et al, 2021). Additionally, the internal friction angle of loess increases with increasing dry density (Zhou et al, 2018a;Kong et al, 2021;Guo et al, 2021). The internal friction angle of loess is influenced by freeze-thaw cycles, and the results of these studies are different.…”

Section: Introductionmentioning

confidence: 99%

Prediction of internal friction angle of Q2-Q3 mixed loess as affected by weight ratio based on modified adhesion theory

HE,

Zheng,

Jiang

2023

Preprint

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Due to geography and construction technique considerations, Q2-Q3 mixed loess has been used for some loess high-fill slopes in Yan'an, China. The predicting formula for weight ratio and internal friction angle of Q2-Q3 mixed loess with optimal water content is essential for determining the stability of these slopes. This study assumed that the Q2-Q3 mixed loess was a homogeneous, single-species equivalent loess to simplify the derivation of the equation without impacting the research outcomes. This study utilized the stress synthesis law to present a hypothetical stress formula. Two limit cases were considered to determine the formula parameters. Then, the study derived the sliding conditions of equivalent loess soil particles according to the law of bound water. Finally, the study established a formula for predicting the internal friction angle of Q2-Q3 mixed loess based on the definition of the friction factor and the relationship between the water content and the bound water thickness. The results indicate that the predicted internal friction angle of Q2-Q3 mixed loess has minor relative errors, which confirms the accuracy of the formulas developed in this paper. Additionally, as the weight ratio increased, the internal friction angle of the Q2-Q3 mixed loess increased.

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“…Scholars at home and abroad have done a lot of work on the impact of grain size composition on other soil engineering properties [26][27][28][29][30]. Thevanayagam and Mohan [31] studied the influence of fine grain content on the engineering properties of sand, and proposed to describe the stress-strain relationship of sand by using the inter particle void ratio and state parameters.…”

Section: Introductionmentioning

confidence: 99%

Study on The Influence of Grain Size Composition on Engineering Properties of Granite Residual Soil

Tang¹,

Chen²,

Zhou³

et al. 2023

Pol. J. Environ. Stud.

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The parent rock properties, weathering degree and soil formation conditions of soil in different regions and different levels are different, which results in the obvious difference of grain size composition of soil. At present, the research on granite residual soil often ignores the mechanism of its grain size composition on engineering properties. In this study, a series of soil samples with different grain size composition were configured based on the content of gravel grain in the granite residual soil. This paper mainly studies the influence of the content of gravel grain group and fine grain group of the compaction and strength of granite residual soil. The results show that the optimal moisture content and cohesion of granite residual soil are mainly controlled by the content of fine grain, and the maximum dry density and internal friction angle are mainly controlled by gravel grain. For each 1% increase in the fine grain content of the soil, the optimal moisture content of the soil will approximately increase by 0.11%, and correspondingly, the cohesion of the soil will approximately increase by 0.27 kPa. In addition, the engineering properties of granite residual soil with different grain size composition are also affected by soil structure. Finally, based on the microstructure characteristics of granite residual soil, three different aggregates are proposed, and seven micro models with different structural characteristics are established. Micro models established by different aggregates can control different engineering properties of soil. The research results are helpful to understand the relationship between the engineering properties and grain size composition of granite residual soil and provide reference for the refinement of its engineering classification.

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Effect of conglomeration gradation on loess shear strength with different water content

Cited by 5 publications

References 28 publications

A new method for determining loess particle size distribution based on ‘core + clothes’ structure

A new method for determining loess particle size distribution based on ‘core + clothes’ structure

Prediction of internal friction angle of Q2-Q3 mixed loess as affected by weight ratio based on modified adhesion theory

Study on The Influence of Grain Size Composition on Engineering Properties of Granite Residual Soil

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