Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles

Yang, Zuosheng; Zhang, Liang; Ling, Xianzhang; Li, Guoyu; Tu, Zhibin; Shi, Wei

doi:10.1016/j.coldregions.2019.04.003

Cited by 30 publications

(6 citation statements)

References 12 publications

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“…Although the model includes osmotic pressure ψ (B) , it is a independent variable during mathematical integral. Therefore, the mathematical model of Equation (13) can extend to saturated coarse-grained soil when ψ (B) = 0 as shown in Equation (14).…”

Section: Freezing Model Of Saturated Coarse-grained Soilmentioning

confidence: 99%

“…When referring to the formation mechanism of waterfall ice, the contraction of the underground cross section, and the increase of hydraulic pressure, which is caused by the compaction of subgrade soil, have been always considered as the main factors by scholars. There are also studies that considered 2 of 21 frost depth increases that result from excavating during construction leading to highway waterfall ice hazards [12][13][14]. All of these viewpoints are reasonable, and the main reason for the difference is that the research purposes of these studies are different, and, in addition, the location of the research is different.…”

Section: Introductionmentioning

confidence: 99%

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The Formation Mechanism and Influence Factors of Highway Waterfall Ice: A Preliminary Study

et al. 2019

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Highway waterfall ice hazards usually happen in cold regions. However, minimal research has addressed this so far due to its multidisciplinary nature. In this study, ground water monitoring tests were conducted for 2.5 years to study the relationship between ground water level changes and waterfall ice hazards. To explore the internal factors that lead to highway waterfall ice, gradation tests, penetration tests, and freezing tests were conducted which revealed that coarse-grained particles can enhance the permeability of aquifers. Further, volume expansion of free water freezing in a closed system is the main reason for pore pressure increasing aquifers in research areas. Furthermore, to understand the formation mechanism of highway waterfall ice further, a mathematical model of saturated coarse-grained soil at the state of phase transition equilibrium was obtained. This indicates that the essence of the aquifers’ freezing (coarse-grained soil) in the waterfall ice area is the freezing of closed water. Finally, based on the abovementioned findings, the formation process of waterfall ice is defined as three stages: The drainage obstruction stage, the soil deformation stage, and the groundwater gushing stage, respectively. This definition can provide significant guidance on further research that focuses on prevention of highway waterfall hazards.

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Section: Freezing Model Of Saturated Coarse-grained Soilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Formation Mechanism and Influence Factors of Highway Waterfall Ice: A Preliminary Study

et al. 2019

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“…It has high expansion, collapsibility, crackability, low strength, and other unfavorable engineering characteristics. These characteristics often lead to significant engineering problems such as the inclination of the upper structure, cracking of the subgrade, and slope instability in the expansive soil area, resulting in substantial economic losses worldwide every year [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of Rubber Reinforced Expansive Soil (ESR) at Positive and Negative Ambient Temperatures

Yang

Shi

et al. 2022

Polymers

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Using tire waste rubber reinforced expansive soil (ESR) can modify its poor engineering characteristics. The damping properties of ESR at different temperatures may vary dramatically. Two kinds of rubber Ra (large particle size) and Rb (small particle size) are mixed with expansive soil according to gradient ratio. The backbone curves, dynamic shear modulus, and damping ratio of expansive soil in varying temperature fields of 20 °C, −5 °C, and −15 °C are investigated. The Hardin-Drnevich model can well fit the backbone curves of ESR specimens in various temperature fields. Dynamic triaxial results show that 5–10% Ra rubber can withstand higher shear stress in all temperature fields; Rb rubber can increase the dynamic shear modulus of expansive soil and reach the peak value with 10% rubber content. The damping ratio can be significantly improved by using 10% Ra rubber at room temperature, while the ESR damping ratio in a temperature field of −5 °C does not change significantly with increasing shear strain or even decreases; Ra increases the damping ratio of expansive soils in the temperature field of 15 °C while small particle size Rb decreases the damping ratio of expansive soils. The experimental results validate the effectiveness of ESR in the frozen soil area. In an engineering sense, local temperature needs to be considered to use an appropriate ESR, which can provide effective seismic isolation and damping.

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“…Meanwhile, frost damage and its prevention have been demonstrated [9,10]. Influenced by the annual freeze-thaw cycles, train transportation load will induce subgrade boiling, slope collapsing, settlement, destabilization, and strength reduction because of the destruction of soil structure [11,12]. At present, the main method to improve the mechanical properties of expansive soil under different working conditions is reinforcement [13,14], and good progress has been made.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of Geosynthetic‐Reinforced Expansive Soil under Freeze‐Thaw Cycles

Yang

Liu

Zhang

et al. 2021

Advances in Civil Engineering

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Expansive soil has a significant impact on the stability of many key construction projects in cold regions. To study the physical and mechanical properties of expanded soil under the condition of freeze-thaw cycle, cryogenic cyclic triaxial tests were conducted on the dynamic and the displacement characteristics of geosynthetic-reinforced expansive soil subjected to the freeze-thaw cycles. Compared with the unreinforced expansive soil samples, the effects of freeze-thaw cycles on the soil dynamics were discussed. The dynamic shear modulus (Gd) and damping ratio (λ) of the expansive soil samples are improved by reinforcement. Reinforced soil can inhibit the axial compression of the sample and restrain the frost heave deformation of the sample during the freezing process. Meanwhile, it can delay the structural damage effect caused by frost heave and reduce the rate of change of the Gd and the λ with the freeze-thaw cycle. At the same time, reinforced soil can inhibit the axial expansion, reduce the rate of reduction of the Gd, stabilize it with a higher rate, and reduce the influence of the freeze-thaw cycles on the λ of the expansive soil sample. Finally, the change of mechanical properties of expansive soil under the condition of reinforcement is obtained. The main conclusions of this paper can be used to reinforce the roadbed and foundation engineering of frozen soil in a cold region and provide support for the fiber reinforcement method of expansive soil.

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Experimental study on the dynamic behavior of expansive soil in slopes under freeze-thaw cycles

Cited by 30 publications

References 12 publications

The Formation Mechanism and Influence Factors of Highway Waterfall Ice: A Preliminary Study

The Formation Mechanism and Influence Factors of Highway Waterfall Ice: A Preliminary Study

Dynamic Characteristics of Rubber Reinforced Expansive Soil (ESR) at Positive and Negative Ambient Temperatures

Dynamic Behavior of Geosynthetic‐Reinforced Expansive Soil under Freeze‐Thaw Cycles

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