The effect of freeze-thaw cycling on the mechanical properties of expansive soils

Tang, Liang; Cong, Shengyi; Li, Geng; Xue, Ling; Gan, Fada

doi:10.1016/j.coldregions.2017.10.004

Cited by 114 publications

(32 citation statements)

References 36 publications

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“…As for expansive soil, Tang et al [5] found that the internal friction angle decreased significantly after one freeze-thaw cycle, which is different from our results. e difference between the results may be attributed to the differences in test methods.…”

Section: Shear Strength Parameter Characteristics After Freeze-contrasting

confidence: 99%

“…Large areas of expansive soils have been discovered in seasonal frozen regions accompanying the engineering construction. For example, nearly, 380 km expansive soil open channel in the middle route of South-to-North Water Transfer Project (SNWTP) and more than 260 km of expansive soil cutting slope in the Jilin-Tumen-Hunchun high-speed railway in China were both located in seasonal frozen regions [4][5][6]. In these hydraulic engineering and traffic engineering projects, slope instability of expansive soil frequently occurs after the freeze-thaw process.…”

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-contrasting

confidence: 99%

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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“…(σ 1 − σ 3 ) f increased with confining pressure, which indicated that the latter could inhibit pore-volume changes caused by axial pressure. So, confining pressure can slightly enhance the strength of the samples and have a certain inhibitory effect on deformation and failure [11,31].…”

Section: Experiments Results and Analysismentioning

confidence: 99%

“…(σ1 − σ3)f increased with confining pressure, which indicated that the latter could inhibit porevolume changes caused by axial pressure. So, confining pressure can slightly enhance the strength of the samples and have a certain inhibitory effect on deformation and failure [11,31]. c and the φ are two important indices for evaluating soil's shear strength that are mainly affected by particle-size composition, arrangement, and cementation [32][33][34].…”

Section: Experiments Results and Analysismentioning

confidence: 99%

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

et al. 2019

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In seasonally frozen areas, physical and mechanical soil properties change dynamically under the effect of the freeze-thaw cycles (FTCs), which is a problem that cannot be ignored in geotechnical engineering. In order to study the effect of the FTC on the strength and the mechanism of deformation and failure of saline soil, this paper took Nong’an saline soil as the research object. In total, 105 groups of remolded samples with different salt contents (S) after FTCs were examined in unconsolidated-undrained tests. On the basis of the experiment results, the influence of FTCs on the mechanical properties of Nong’an saline soil was analyzed. The failure principal stress difference (σ1 − σ3)f and cohesion (c) were both decreased with FTC. This occurred especially rapidly after the first cycle and became stable between 30 and 60 cycles. The internal friction angle φ increased at first and then decreased. According to experimental data, a modified Duncan-Chang model was established. Compared with the experiment results, this model was reasonable to simulate the stress-strain relationship of Nong’an saline soil. Furthermore, the empirical formulas of Duncan-Chang model parameters were obtained by regression analysis. This provides a theoretical basis for saline–soil foundation and subgrade engineering in seasonal frozen areas.

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“…e elastic modulus E is also different due to the difference of intercepted line segment on the curve. According to the literature written by Tang et al [36], modulus can be obtained from the linear portion of stressstrain curve. From Figure 9, the connecting line segments of AB are selected as the research object in the experiment.…”

Section: Elastic Modulusmentioning

confidence: 99%

Mechanical Properties, Failure Mode, and Microstructure of Soil-Cement Modified with Fly Ash and Polypropylene Fiber

Duan

Zhang

2019

Advances in Materials Science and Engineering

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In order to investigate the effects of fly ash and polypropylene fiber on mechanical properties, failure mode, and microstructure of soil-cement, the unconfined compression test, splitting tension test, and scanning electron microscopy (SEM) test of soil-cement with different polypropylene fiber contents (0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by weight of dry soil) and fly ash contents (0%, 4%, 8%, and 12% by weight of dry soil) were carried out. The compressive and tensile strengths, deformation characteristics, failure mode, and microstructure of soil-cement modified with fly ash and polypropylene fiber were analyzed. The results show that the unconfined compressive strength and splitting tensile strength of soil-cement show a trend of increasing first and then decreasing with the increase of polypropylene fiber and fly ash content. Under the condition of 0.4% polypropylene fiber and 8% fly ash, the unconfined compressive strength and the splitting tensile strength are 4.90 MPa and 0.91 MPa, respectively, which increased by 32.79% and 51.67% as compared with the plain soil-cement, respectively. When 8% fly ash was used in the experiment, the unconfined compressive peak strain and the splitting tensile peak strain of the inclusion of 0.4% polypropylene fiber were 0.0410 and 0.0196, respectively. The corresponding peak strains were increased by 20.94% and 68.97% as compared with non-fiber-stabilized soil-cement, respectively. The stress-strain curve of fly ash soil-cement modified with polypropylene fiber can be divided into compaction phase, linear rise phase, nonlinear rise phase, and failure phase. Polypropylene fiber constrains the lateral deformation of fly ash soil-cement, which improves the peak strain and the failure mode of soil-cement.

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The effect of freeze-thaw cycling on the mechanical properties of expansive soils

Cited by 114 publications

References 36 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

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

Mechanical Properties, Failure Mode, and Microstructure of Soil-Cement Modified with Fly Ash and Polypropylene Fiber

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