Effects of Cyclic Freezing–Thawing on Dynamic Properties of Loess Reinforced with Polypropylene Fiber and Fly Ash

Chen, Shu-feng; Luo, Tao; Li, Gang; Zhang, Yao

doi:10.3390/w14030317

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…Su and Lei 39 pointed out that palm fiber can remarkably improve UCS of loess, and the influence of dry density on strength is significant, while the impact of FL is not significant. Chen et al 40 declared that the dynamic shear modulus of loess enlarged remarkably with raising fly ash content and cell pressure, whereas the damping ratio decreased as increasing fly ash content and σ 3 . Yang et al 41 found that the polypropylene fibers can change the cement-modified loess from brittle to plastic damage, and the fibers played a bridging role.…”

Section: Introductionmentioning

confidence: 99%

Shear strength characteristics of basalt fiber-reinforced loess

Chen,

Li,

Liu

et al. 2023

Sci Rep

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Loess owns the characteristics of collapsibility, disintegration and solubility, which pose a challenge to engineering construction. To examine the shear strength of basalt fiber-reinforced (BFR) loess, consolidated undrained (CU) triaxial tests were conducted to explore the impacts of water content (w), fiber length (FL), fiber content (FC) and cell pressure (σ3) on the shear strength. According to the results, the shear strength model was established taken into account the impacts of FL, FC, and fiber diameter (d). The results showed that the peak strength of BFR soils enhanced as FL, FC, and σ3 increasing, whereas it decreased with increasing of w. Compared to unreinforced soil, the peak strength of BFR loess improved 64.60% when FC was 0.2% and FL was 16 mm. The optimum reinforcement condition for experimental loess was that of FL was 16 mm and FC was 0.8%. The reinforcing mechanism of fibers was divided into a single tensile effect and spatial mesh effect. The experimental and calculated results agreed well, which suggested the model is suitable for predicting the shear strength of BFR loess. The research results can offer a guideline for the application of BFR loess in the subgrade and slope engineering.

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Section: Introductionmentioning

confidence: 99%

Shear strength characteristics of basalt fiber-reinforced loess

Chen,

Li,

Liu

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…Su and Lei 18 pointed out that palm ber can remarkably improve UCS of loess, and the in uence of dry density on strength is signi cant, while the impact of FL is not signi cant. Chen et al 19 declared that the dynamic shear modulus of loess enlarged remarkably with raising y ash content and cell pressure, whereas the damping ratio decreased as increasing y ash content and σ 3 .…”

Section: Introductionmentioning

confidence: 99%

Shear strength characteristics of basalt fiber-reinforced loess: experimental investigation and model prediction

Chen

Liu

et al. 2023

Preprint

Self Cite

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Loess owns the characteristics of collapsibility, disintegration and solubility, which pose a challenge to engineering construction. To examine the shear strength of basalt fiber-reinforced (BFR) loess, consolidated undrained (CU) triaxial tests were conducted to explore the impacts of water content (w), fiber length (FL), fiber content (FC) and cell pressure (σ3) on the shear strength. The microstructure of reinforced loess was constructed using SEM measurements to reveal the reinforcing mechanism of basalt fibers. According to the results, the shear strength model was established taken into account the impacts of FL, FC, and fiber diameter (d) using the regression analysis method. The results showed that the peak strength of BFR soils enhanced as FL, FC, and σ3 increasing, whereas it decreased with increasing of w. The reinforcing mechanism of fibers was divided into a single tensile effect and spatial mesh effect, and the bridging effect transformed the force, which improved the overall ability of composites to resist deformation and damage. The experimental and calculated results agreed well, which suggested the model is suitable for predicting the shear strength of BFR loess. The research results can offer a guideline for the application of BFR loess in the subgrade and slope engineering.

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“…In addition, many scholars have investigated the effects of various factors on the degradation mechanism of soil mechanic properties under a cyclic freeze-thaw action and have constantly tried to improve soil under freeze-thaw cycles [17,18]. The influence factors under investigation were of two types: environmental factors, which mainly included the number of freeze-thaw cycles, amplitude, and freeze-thaw temperature; and the soil's physical indices, such as moisture content and density.…”

Section: Introductionmentioning

confidence: 99%

Effect of Freeze-Thaw on Mechanical Properties of Loess with Different Moisture Content in Yili, Xinjiang

Guo

Zhang

et al. 2022

Sustainability

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Various geological disasters such as collapses, landslides, and mudslides occur frequently in Yili, Xinjiang. The loess in this area provides a basis for the occurrence of landslides and other disasters. At the same time, Yili Valley is typically a seasonally frozen soil region. The freeze–thaw cycle is an essential disaster-inducing factor. However, scholars have lain a research emphasis on the material source of the Yili Loess, while lacking a systematic investigation of the degradation mechanism of the soil’s physical and mechanical properties under the freeze–thaw action. Therefore, it is prudent to investigate the changes in mechanical properties of loess in this region under the freeze–thaw cycle. In this study, focusing on a typical loess landslide in Yili, some in situ soil samples were collected to conduct related physical and mechanical tests. According to the maximum dry density and optimum moisture content of the loess in the region, four different groups of soil samples with varying moisture contents were prepared and subjected to different freeze–thaw cycles. The changes of apparent individual characteristics under freeze–thaw cycles were observed, and a consolidated undrained (CU) shear test was carried out to obtain the changes of shear strength indices of loess samples with varying moisture contents under freeze–thaw cycles. The results showed the obvious development of characteristics during freeze–thaw cycles, with the growth of many frost and ice crystals. At the freezing stage, the growth of ice crystals led to hexagonal peeling bodies on the surface layer. At the thawing stage, a rapidly melting network ice crystal pattern imposed a thermal thawing disturbance on the surface rock soil. After multiple freeze–thaw cycles, the soil’s peak strength dropped significantly and the internal friction angle changed slightly, but the cohesion was adversely affected, with frequent fluctuations. The present study enhances the research level of loess’s mechanical and strength properties under freeze–thaw cycles and provides a theoretical foundation for preventing loess landslides in this region.

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Effects of Cyclic Freezing–Thawing on Dynamic Properties of Loess Reinforced with Polypropylene Fiber and Fly Ash

Cited by 10 publications

References 30 publications

Shear strength characteristics of basalt fiber-reinforced loess

Shear strength characteristics of basalt fiber-reinforced loess

Shear strength characteristics of basalt fiber-reinforced loess: experimental investigation and model prediction

Effect of Freeze-Thaw on Mechanical Properties of Loess with Different Moisture Content in Yili, Xinjiang

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