Influence of Soil Particle Size on the Engineering Properties and Microstructure of a Red Clay

Wang, Yongwei; Li, Kunyao; Li, Jiaming; Tang, Shibin

doi:10.3390/app112210887

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…Among the main factors determining soil deformation is the particle size and the amount of fine fraction in soil, which are responsible for soil's mechanical properties and stability. Eventually, all cracks, layers, and large pores directly impact soil deformation and its mechanical properties under load (Wang et al 2021).…”

Section: Impact Of Soil Composition On Its Deformationmentioning

confidence: 99%

“…2), while permeability decreases (Akayuli et al 2013;Reece 2021). Under applied load, the mechanism of soil failure changes from the splitting one to the shear one with the increasing soil particle size (Wang et al 2021). Generally, the content of grain size in soil is crucial for determining soil's stress-strain and strength characteristics.…”

Section: Impact Of Soil Composition On Its Deformationmentioning

confidence: 99%

“…The performed analysis of the derived model's reliability (Table 1) shows that the content of natural water and that of fine fraction (clay) as well as soil cone resistance are the most reliable indicators for the correlation existing between the determined and the estimated oedometer deformation moduli. According to numerous researchers, the content of natural water content and that of fine fraction (clay) in soil are the main factors determining its deformation properties (Wang et al 2021;Hov, Gaharia 2023).…”

Section: Multinomial Logistic Regression Model Analyses Of All the Di...mentioning

confidence: 99%

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Factors affecting the oedometric modulus of till soil

Lekstutytė,

Urbaitis,

Žaržojus

et al. 2023

Baltica

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Soil deformation moduli are affected by a number of factors including the intensity of applied load in drained or undrained conditions, stress-strain characteristics, confining pressure, stress history, and soil type. Determination of the deformation properties of glacial soils requires long-term research. As evidenced by a review of previous studies, Lithuanian glacial soils are still insufficiently explored. Our study focuses on the deformation properties of till soil, specifically, on the properties that have a significant impact on soil settlement or compressibility, and its calculations. The current study presents the oedometer deformation modulus determined and predicted under stress at 0.2 and 0.4 MPa levels, which are most often used in geotechnical design. These index values allowed identifying the major factors responsible for the variation in deformation behaviour of different groups of till soils. The most significant finding of this study was the absence of a direct correlation between the oedometer modulus (Eoed) and cone resistance (qc). Instead, based on the content of natural soil water (w), proportion of fine fraction (clay), and cone resistance (qc), we found that the most reliable correlation exists between the determined (EDoed) and estimated (EEoed) oedometer moduli. It is important to note that regression models are applicable and reliable only within specific ranges of these factors. The valid limits for these models are: water content in the range of 7.7%–15.4%, clay fraction in the range of 4.0%–20.0%, and cone resistance in the range of 1 MPa–5 MPa.

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Section: Impact Of Soil Composition On Its Deformationmentioning

confidence: 99%

Section: Impact Of Soil Composition On Its Deformationmentioning

confidence: 99%

Section: Multinomial Logistic Regression Model Analyses Of All the Di...mentioning

confidence: 99%

See 1 more Smart Citation

Factors affecting the oedometric modulus of till soil

Lekstutytė,

Urbaitis,

Žaržojus

et al. 2023

Baltica

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“…The macroscopic physical and mechanical properties of the rock and soil as well as their specific engineering properties all depend on their microscopic structure (Zuo et al, 2016;NOWAMOOZ et al, 2016;Zhao et al, 2018;Zhou et al, 2021). However, most studies have focused on the micro-structure of the red clay, expansive soil, loess, and silty sand (ALDAOOD et al, 2014;Jiang et al, 2014;AHMED, 2015;Lin and Amy, 2015;Sun and Cui, 2018;Xiao et al, 2020;Wang et al, 2021), for instance. Some studies had also investigated the slope protection and the reinforcement of the CBS, the physical and the mechanical properties of the soil, and the micro-structure parameters (Hang et al, 2019;Huang and Zheng, 2021;Zhang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

A study on the shear strength characteristics and microscopic mechanism of coal-bearing soil under dry-wet cycles

Fan

Zheng

2023

Front. Earth Sci.

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The slope of coal-bearing strata distributed along the high-speed highway (railway) is affected by the atmospheric dry-wet cycles (DWC), and the collapse occurs many times during the construction of such highways, in Pingxiang city, in the province of Jiangxi. The DWC affect the strength characteristics of the unsaturated coal-bearing soil (CBS). In order to study the shear-strength characteristics of the unsaturated CBS under the DWC, the relationship between the shear strength and matric suction was analyzed by using direct shear test of the unsaturated CBS, the filter paper method of the matrix suction measurement, and the scanning electron microscope test. The internal reasons of shear strength attenuation of unsaturated CBS under DWC are revealed from microscopic perspective. The results show that the DWC at 0 to 4 times, with an increase in the water content, the clay domains expanded unevenly. Further, the clay minerals that served as the cementing junctions and soluble salts were softened and dissolved, and the bonding strength between the basic units and the cohesion of the samples decreased, so that the shear strength of unsaturated CBS samples decreased with an increase in the water content, and increased with the increase of matric suction. Under the influence of the DWC, the CBS samples slaked, the quartz matrix between the fissures slaked, and produce fragments and debris which reduced the size of large particles, and the bonding strength between the basic units was low. Therefore, the matric suction and the shear strength of the unsaturated CBS samples with the same moisture content, under the same normal pressure, decreased gradually with an increase in the number of the DWC. It is feasible to study the strength characteristics of unsaturated CBS by combining the test methods of macroscopic strength, matric suction and microstructure of soil.

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“…Qi et al researched the mechanical properties of red clay after indoor wet–dry cycles through triaxial consolidation drainage and direct shear tests [ 21 ]. Through the unconfined compressive strength (UCS), wetting–drying (WD), and low-temperature nitrogen adsorption tests, Wang et al found that the failure mechanism in the UCS test varies depending on the dry density [ 22 ]. Chen conducted shear tests on soil samples from different weather conditions and depths by embedding sensors inside the red clay slope and analyzing the characteristics and evolution process of slope failure [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

Feng,

Teng,

Wang

2023

Materials

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To investigate the influencing factors and mechanisms of shear strength of red clay with a high liquid limit, which was selected at different milepost locations based on the Nanning Bobai Nabu Section Project of the Nanning Zhanjiang Expressway, the basic physical properties of red clay were determined using a liquid plastic limit test, compaction test, inductively coupled plasma optical emission spectrometer (ICP-OES), and X-ray fully automatic diffractometer (XRD). Red clay with a high liquid limit was selected. Furthermore, the direct shear test was used to study the effect of different water contents and compaction degrees on the shear strength. The experimental results demonstrate that under the same compaction degree, the shear stress of the soil sample increases significantly with an increase in normal stress, and the greater the water content, the smaller the shear stress of the soil sample. At 200 kPa, the shear strength of soil samples with 24% water content is 57%, 46%, and 35% of the shear strength of soil samples with 15% water content under different compaction degrees(K) of 86%, 90%, and 93%, respectively. Under the same moisture content, the shear stress of the soil sample shows an increasing trend with an increase in the degree of compaction, and the greater the compaction degrees, the greater the shear stress of the soil sample. The cohesion c and internal friction angle φ of soil samples increase with an increase in the compaction degree, but the increase in cohesion c is also affected by the water content. Under the condition of low water content, the cohesion c of soil samples can be increased by 1.06 times when the water content is 15% and by 0.47 times when the water content is 18%. Under the condition of high water content, the cohesion c of soil samples with 21% water content only increases by 0.3 times, and that with 24% water content only increases by 0.35 times.

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Influence of Soil Particle Size on the Engineering Properties and Microstructure of a Red Clay

Cited by 10 publications

References 23 publications

Factors affecting the oedometric modulus of till soil

Factors affecting the oedometric modulus of till soil

A study on the shear strength characteristics and microscopic mechanism of coal-bearing soil under dry-wet cycles

Influence Mechanism of Water Content and Compaction Degree on Shear Strength of Red Clay with High Liquid Limit

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