The Influence of Freeze-Thaw Cycles on the Mechanical Properties and Parameters of the Duncan-Chang Constitutive Model of Remolded Saline Soil in Nong’an County, Jilin Province, Northeastern China

Peng, Wei; Wang, Qing; Liu, Yufeng; Sun, Xiaohui; Chen, Yating; Han, Mengxia

doi:10.3390/app9224941

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…Therefore, considering the regional applicability of SNS, and according to Test Methods of Materials Stabilized with Inorganic Binders for Highway Engineering (JTG E51-2009) [23], the 10% SNS-S and the cement stabilized soil (CS-S) were put into a cryogenic chamber (−18 • C ± 2 • C) and a thermostatic water tank (20 • C ± 2 • C), respectively, for freeze-thaw cycles by simulating the climatic environment of alternating cold and hot. Finally, their antifreeze indexes were calculated by the loss strength before and after the freeze-thaw cycles [24,25].…”

Section: Freeze-thaw Cycle Testmentioning

confidence: 99%

Research and Application of Slag–Nanosilica Stabilizer for Silt Subgrade

Wang

Dong

et al. 2021

Applied Sciences

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With the rapid development of construction and road engineering, the accumulation of silting waste soil is becoming more and more serious. In order to recycle the silt, a new type of stabilizer was developed in this study to improve its mechanical properties and applicability on roads. The optimal ratio of stabilizer components was determined by orthogonal test and grey correlation analysis. The effects of stabilizer on the macroscopic mechanical properties of silt were investigated by unconfined compressive strength (UCS) test and split test. The water stability test and freeze–thaw cycle test were carried out to study the durability and road performance of stabilized soil. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods were used to study the effect of the stabilizer on the microstructure and mechanism of silt. The results showed that the optimal mixture ratio of the new type of stabilizer was quicklime: nanosilica: slag = 32:3:65. Adding 10% stabilizer is a reasonable and effective method to strengthen silt, which has the characteristics of high strength and strong durability in the early period. The addition of stabilizer will result in hydration reaction, pozzolanic reaction, and cation exchange on the surface of soil particles with silt, which will enhance the intermolecular force of soil particles, reduce the porosity of soil, and strengthen the connection between soil particles.

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Section: Freeze-thaw Cycle Testmentioning

confidence: 99%

Research and Application of Slag–Nanosilica Stabilizer for Silt Subgrade

Wang

Dong

et al. 2021

Applied Sciences

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“…During the formation of soil, various physical and chemical interactions form associations between particles that provide structural strength, and soil with structural strength is called structural soil [1,2]. The structural strength of soil causes differences in the engineering properties of undisturbed and remolded soils [3,4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structural Strength of Expansive Soil in a Seasonally Frozen Region

Sun,

Song,

Niu

et al. 2024

Buildings

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The existence of structural strength in undisturbed soil results in its distinct characteristics compared to remolded soil. Under the influence of freeze–thaw cycles, this difference may easily cause geotechnical disasters in cold regions. This study aimed to analyze and discuss the expression degree and influencing factors of the structural strength of expansive soil. The unconfined compressive strength (UCS) test, high-pressure consolidation test, and microscopic test were performed on expansive soil retrieved from a seasonally frozen region. Moreover, sensitivity parameters, including stress sensitivity (St.qu, St.σk) and strain sensitivity (St.ɛu, St.Cc), were applied to explore the expression degree and influencing factors of structural strength in a seasonally frozen region. The results reveal that the undisturbed samples have better structural connection and particle arrangement than the remolded samples. However, the primary fractures have a certain degrading effect on the strength of the undisturbed soil as influenced by a seasonally frozen region. With the increase in water content and the decrease in density, the expression degree of the structural strength in terms of compressive strength and the ability to resist deformation enhances under the unconfined condition. By contrast, the expression degree increases in strength and decreases in ability under the confined condition. Furthermore, the effect mechanisms of the basic property, particle composition, structural linkage, lateral confinement, and historical role on the structural expression were analyzed.

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“…analyzed the volumetric strain, stress-strain, and shear strength of fine-grained, complex, mixed saline soils containing NaCl and Na 2 SO 4 at low temperatures [29]. Some researchers also explored the effects of FCTs and salt solution (Na 2 SO 4 and NaHCO 3 ) contents on the shear properties of mixed saline soil in the Songnen Plain, Northeast China [30][31][32]. It was found that the transportation of soil water and salt of saline soil was affected by temperature, and the FTCs increased the ion exchange capacity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Shear Strength of Carbonate Saline Soil under Freeze-Thaw Cycles

et al. 2022

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Climate change is accelerating its adverse impact on ecosystems and infrastructure systems in cold regions. For extensive carbonate saline soil areas, their response to the freeze-thaw cycle remains uncertain. By considering the continuous intensification of freeze-thaw cycle frequency, the mechanical characteristics of carbonate saline soils are analyzed for different salt content (0.6% to 2.1%) based on the mechanical test in this paper. The purpose is to reveal the change law of shear strength and its parameters of carbonate saline soils under the scenario of continuous freezing and thawing cycles. The micro-characteristics of the carbonate saline soil before and after freeze-thaw cycling were analyzed by scanning electron microscopy, indicating changes in the structural soil properties caused by the combination of freeze-thawing and salinity. The scanning electron microscope images reveal the cumulative effect of frost heaving and salt expansion, i.e., increasing the number of pores between particles, reducing the effective contact between particles, and weakening the interaction force, resulting in cracks development. A series of mechanical tests demonstrate the stress-strain behavior of carbonate saline soils for different numbers of freeze-thaw cycles under different confining pressures. A transformation from strain-softening to strain-hardening is observed with an increase in the salt content from 0.6% to 2.1%. Furthermore, the shear strength of the carbonate saline soil decreases as the salt content and number of freeze-thaw cycles increase. The shear strength degradation mechanism is attributed to the cohesion and the internal friction angle. These shear strength parameters are critical in geotechnical analyses, such as evaluating of load capacity of foundations and slope stability in similar saline soils.

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The Influence of Freeze-Thaw Cycles on the Mechanical Properties and Parameters of the Duncan-Chang Constitutive Model of Remolded Saline Soil in Nong’an County, Jilin Province, Northeastern China

Cited by 10 publications

References 28 publications

Research and Application of Slag–Nanosilica Stabilizer for Silt Subgrade

Research and Application of Slag–Nanosilica Stabilizer for Silt Subgrade

Investigation of the Structural Strength of Expansive Soil in a Seasonally Frozen Region

Experimental Investigation of Shear Strength of Carbonate Saline Soil under Freeze-Thaw Cycles

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