Multi-Scale Analysis of Geotechnical and Physicochemical Changes in Loess Caused by Nano-SiO2 Pile Migration

Kong, Ran; Gao, Lei; Zhao, Wenqing; Zhao, Bo

doi:10.3389/feart.2021.747317

Cited by 2 publications

(1 citation statement)

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“…Therefore, the conclusions and theoretical formulas obtained in this study have certain restrictions. Secondly, the water used in this study is distilled water, which is unrealistic due to the fact that the water in the filed contains many mixtures due to solute transport and other chemical effects [10,[55][56][57]. Finally, the influence of dry-wet cycle on loess in the field is very complicated due to the influence of rainfall, irrigation water, evaporation, and other factors [8,9,11,12], which could not be simply simulated by dry-wet cycles.…”

Section: Limitations Of the Experimental Test In This Studymentioning

confidence: 99%

Time-Dependence of the Mechanical Behavior of Loess after Dry-Wet Cycles

Liu

Wang

et al. 2022

Applied Sciences

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The structure, time-dependent mechanical deformation, and strength characteristics of loess, which is loose and porous with well-developed vertical joints, are greatly affected by the dry-wet cycles, which are attributed to periodic artificial irrigation, rainfall, and water evaporation. To better understand the creep characteristics of loess under the effect of dry-wet cycles, Q2 loess samples obtained from the South Jingyang County, China, were subjected to different dry-wet cycles (0, 5, 10, 15, 20) and sheared in triaxial creep tests. The experimental results revealed that: firstly, the maximum value of the deviatoric stress corresponding to creep failure gradually decreases with an increase in the dry-wet cycles. Secondly, the long-term strength of the loess after dry-wet cycles were obtained through the Isochronous Curve Method. It is found that the long-term strength and the number of dry-wet cycles showed an exponential decreasing relationship. In addition, the creep damage mechanism of loess due to dry-wet cycles is proposed. This study may provide the basis for understanding the mechanical behavior of the loess under the effect of dry-wet cycles, as well as guidelines for the prevention and prediction of loess landslide stability.

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Section: Limitations Of the Experimental Test In This Studymentioning

confidence: 99%

Time-Dependence of the Mechanical Behavior of Loess after Dry-Wet Cycles

Liu

Wang

et al. 2022

Applied Sciences

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Bearing Characteristics and Negative Skin Friction Preventive Measures for Highway Bridge Pile Foundations in Collapsible Loess Areas Under Water Immersion

Bian,

Wei

2024

Water

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In collapsible loess sites, large-scale collapsible settlement may occur after water immersion, which will reduce the bearing capacity of existing highway bridge pile foundations and pose serious potential safety hazards. Given this, a large-scale field pile foundation immersion–loading test was conducted in a collapsible loess site. The settlement law of collapsible loess during the immersion was obtained, the bearing characteristics of pile foundations under the loading and immersion–loading conditions were compared and analyzed, and the formation mechanism of negative skin friction was discussed. The results show that the degree of collapsible deformation is related to the duration of immersion, external load, boundary conditions, and soil layer depth. Whether the collapsible loess site is immersed or not can only change the value and transfer rate of the axial force of the pile foundation but cannot change its transfer law. The collapsible deformation will increase the utilization rate of the pile tip resistance. During the collapsible settlement process, part of the gravity of the soil around the pile will be transferred to the pile, generating negative skin friction on the pile shaft. On this basis, eight preventive measures for reducing the negative skin friction of pile foundations in collapsible loess sites were proposed. The research findings can serve as a valuable reference for the design and construction of highway bridge pile foundations in collapsible loess areas.

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Multi-Scale Analysis of Geotechnical and Physicochemical Changes in Loess Caused by Nano-SiO2 Pile Migration

Cited by 2 publications

References 40 publications

Time-Dependence of the Mechanical Behavior of Loess after Dry-Wet Cycles

Time-Dependence of the Mechanical Behavior of Loess after Dry-Wet Cycles

Bearing Characteristics and Negative Skin Friction Preventive Measures for Highway Bridge Pile Foundations in Collapsible Loess Areas Under Water Immersion

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