Shear strength of frozen clay under freezing-thawing cycles using triaxial tests

Wang, Miao; Meng, Sheng; Sun, Yiqiang; Fu, Haiqing

doi:10.1007/s11803-018-0474-5

Cited by 30 publications

(22 citation statements)

References 17 publications

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“…e change of internal friction angle of the soils after freeze-thaw is still controversial. e increased results, decreased results, and consistent results all can be found in the literature [12,14,15,18]. ere are two opposite effects on the internal friction angle of the soils subjected to freezethaw.…”

Section: Shear Strength Parameter Characteristics After Freeze-supporting

confidence: 86%

“…Laboratory experiments offer a possibility to explore the shear strength variation characteristics of soil under the freeze-thaw effect [12][13][14][15][16][17][18][19]. It needs to be emphasized that the soil samples' freezing and thawing boundary conditions in the laboratory experiments should be consistent with the actual situation on-site.…”

Section: Introductionmentioning

confidence: 99%

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Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze‐Thaw Effect with Water Supplement

Wang

Yong³

2021

Advances in Civil Engineering

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Shear strength of shallow expansive soil varies along with the depth under the freeze-thaw effect. This work investigates shear strength characteristics of shallow expansive soil by simulating the actual freeze boundary conditions of seasonal frozen areas with water supplement. An integrated approach incorporating the freeze-thaw test and direct shear test was adopted. Firstly, unidirectional freezing tests for expansive soil columns under three different freezing temperature gradients were carried out. Secondly, direct shear tests under low vertical stress were performed on the standard samples, which were prepared by using cutting rings cut the thawed expansive soil columns into nine segments along with the depth. Temperature, water content, and dry density at different depths were also investigated after the freeze-thaw process. The test results showed that, after the freeze-thaw process, the shear strength of expansive soil columns showed significant differences along with the depth and highly correlated with water content, specifically the higher water content and the lower shear strength. The minimum shear strength in the expansive soil columns occurred at the soil layer below the frozen and unfrozen zones interface. The expansive soil column’s shear strength changed most under the moderate freezing temperature gradient corresponding to the most considerable shear strength reduction. Moreover, the significant decrease in cohesion was the main reason for the shear strength reduction of expansive soil after the freeze-thaw process. These results indicate significant depth variability in shear strength of expansive soil under the freeze-thaw effect.

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Section: Shear Strength Parameter Characteristics After Freeze-supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze‐Thaw Effect with Water Supplement

Wang

Yong³

2021

Advances in Civil Engineering

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“…Where the machine stopped during the shearing process, the damage value was also recorded. If the maximum value of the dial indicator reading was reached during the shearing process, the instrument continued to apply shear stress until the displacement reached 6 mm [48,49].…”

Section: Direct Shear Testmentioning

confidence: 99%

Influence of Freeze–Thaw Cycles and Binder Dosage on the Engineering Properties of Compound Solidified/Stabilized Lead-Contaminated Soils

Zhong

Wang

et al. 2020

IJERPH

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The solidification/stabilization (S/S) method is the usual technique for the remediation of soils polluted by heavy metal in recent years. However, freeze-thaw cycles, an important physical process producing weathering of materials, will affect the long-term stability of engineering characteristics in solidified contaminated soil. In addition, it is still questionable whether using large dosages of binders can enhance the engineering properties of solidified/stabilized contaminated soils. In this study, the three most commonly used binders (i.e., cement, quicklime, and fly ash), alone and mixed in different ratios, were thus added to lead-contaminated soil in various dosages, making a series of cured lead-contaminated soils with different dosages of binders. Afterward, unconfined compression strength tests, direct shear tests, and permeability tests were employed on the resulting samples to find the unconfined compressive strength (UCS), secant modulus (E 50 ), internal friction angle (ϕ), cohesion (c), and permeability coefficient (k) of each solidified/stabilized lead-contaminated soil after 0, 3, 7, and 14 days of freeze-thaw cycles. This procedure was aimed at evaluating the influence of freeze-thaw cycle and binder dosage on engineering properties of solidified/stabilized lead-contaminated soils. Results of our experiments showed that cement/quicklime/fly ash could remediate lead-contaminated soils. However, it did not mean that the more the dosage of binder, the better the curing effect. There was a critical dosage. Excessive cementation of contaminated soils caused by too much binder would result in loss of strength and an increase in permeability. Furthermore, it was found that UCS, E 50 , ϕ, c, and k values generally decreased with the increase in freeze-thaw cycle time-a deterioration effect on the engineering characteristics of solidified lead-contaminated soils. Avoiding excessive cementation, 2.5% cement or quicklime was favorable for the value of E 50 while a 2.5% fly ash additive was beneficial for the k value. It is also suggested that if the freeze-thaw cycle continues beyond the period supported by excessive cementation, such a cycle will rapidly destroy the original structure of the soil and create large cracks, leading to an increase in permeability. The results also showed that the contaminated soils with a larger dosage of binders exhibited more significant deterioration during freeze-thaw cycles.

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“…Recent studies have focused on the static strength, shear modulus or resilient modulus and damping ratio of frozen soil using wave propagation, dynamic triaxial, resonant column, and ultrasonic testing (Lin et al, 2018;Renliang et al, 2019;Wang et al, 2018;Zhang and Hulsey, 2015;Zhao et al, 2017). Temperature, shear strain amplitude, loading frequency, mean effective confining pressure, and relative density or water content influence the dynamic properties of frozen soil (Flora and Lirer, 2013;Wang et al, 2003;Zhao et al, 2017;Zhu et al, non-freezing temperatures, the variable confining pressure moduli were approximately 45-55 % lower than the corresponding constant confining pressure moduli.…”

Section: Introductionmentioning

confidence: 99%

Shear modulus and damping ratio of clay soil under repeated freeze-thaw cycles

Roustaei¹

2021

Acta Geodynamica Et Geomaterialia

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The dynamic properties of soil deposits subjected to dynamic loading, such as the shear modulus G and material damping ratio D, are important parameters in ground response seismic analysis. In seasonally frozen regions, these properties can be significantly affected by microstructural changes that occur during freeze-thaw cycles. The current study evaluated the dynamic properties of clayey soil exposed to freeze-thaw cycles. Dynamic triaxial testing was conducted to determine the influence of mean effective consolidation stress, cyclic stress ratio, loading frequency, and freeze-thaw cycles on G-γ and D-γ curves. Scanning electron microscopy (SEM) was carried out to investigate microstructural changes in the clay soil fabric. The results indicate the freeze-thaw process has an important effect on dynamic properties of the soil. The dynamic shear modulus increases with increasing effective confining pressure, loading frequency, and confining pressure, and decreases with increasing number of freeze-thaw cycles. Development of more voids between clay particles after ice lens formation during these cycles results in an increase in the damping ratio, but this trend decreases with increasing confining pressure. Increasing the loading frequency increases or decreases the damping ratio depending upon the mean effective confining pressure and number of freeze-thaw cycles.

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Shear strength of frozen clay under freezing-thawing cycles using triaxial tests

Cited by 30 publications

References 17 publications

Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze‐Thaw Effect with Water Supplement

Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze‐Thaw Effect with Water Supplement

Influence of Freeze–Thaw Cycles and Binder Dosage on the Engineering Properties of Compound Solidified/Stabilized Lead-Contaminated Soils

Shear modulus and damping ratio of clay soil under repeated freeze-thaw cycles

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