Strength properties of ice-rich frozen silty sands under uniaxial compression for a wide range of strain rates and moisture contents

Du, Haimin; Ma, Wei; Zhang, Shujuan; Zhou, Zhiwei; Liu, Enlong

doi:10.1016/j.coldregions.2015.11.017

Cited by 28 publications

(8 citation statements)

References 15 publications

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“…Similar results were found for frozen silty clay [23]. However, increasing the initial ice content from 30% to 304% caused the strength of frozen silty sand to increase nonlinearly and then gradually stabilize [24]. In some studies [25,26], different ranges of confining pressure and temperature were found to lead to different variation characteristics of the strength with the water content.…”

Section: Introductionsupporting

confidence: 71%

“…A general expression for the influence of the moisture content on the uniaxial compressive strength of frozen soil was presented in a previous study [18]. Some researchers have suggested that this general expression is considerably affected by the temperature and strain rate [20]. Experimental results for saturated frozen sand indicated that the uniaxial compressive strength decreased as the moisture content increased [21,22].…”

Section: Introductionmentioning

confidence: 97%

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Experimental Study on the Characteristics of the Failure Strain Energy Density of Undisturbed Ice-Rich Frozen Clay

Zhang

et al. 2023

Atmosphere

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Using the triaxial shear or compressive strength as a single index of the resistance of frozen soils to failure does not always meet frozen soil engineering requirements for the comprehensive evaluation of the resistance. In this study, triaxial compression experiments were carried out on undisturbed ice-rich frozen clay samples with various levels of water content under different confining pressures to study the characteristics of the failure strain energy density of the samples. The results indicate that as the confining pressure increased, the failure strain energy density first increased and then decreased. The failure strain energy density reached a maximum at a critical confining pressure of 2.00 MPa for 13.25–25.76% water content and 1.00 MPa for 26.02–45.82% water content. The failure strain energy density increased as the water content increased at low confining pressures (0.05–0.50 MPa) but then declined slightly at intermediate confining pressures (1.00–2.00 MPa). At a high confined pressure of 3.00 MPa, the failure strain energy density decreased overall as the water content increased. There were similarities and differences between the change characteristics of the compressive strength and the failure strain energy density. The failure strain energy density can be used as a supplementary reference index of the resistance of frozen soils to damage. The variation characteristics of the failure strain energy density of undisturbed frozen clay are essentially consistent with those of remolded frozen sandy soils. However, there are also clear differences between the characteristics of the failure strain energy density of these two types of frozen soil.

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Section: Introductionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 97%

Experimental Study on the Characteristics of the Failure Strain Energy Density of Undisturbed Ice-Rich Frozen Clay

Zhang

et al. 2023

Atmosphere

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“…With the continuous research on the mechanism of strength change of frozen soil freeze–thaw interface and soil-structure interface, researchers have also started to pay attention to the effect of temperature on the strength of the soil-ice interface. Du et al 19 used uniaxial tests to research the relationship between strength and water content of ice-rich frozen silty sand. Gao et al 14 conducted shear tests at positive temperature and shear tests at the soil-ice interface for different types of soils, respectively, and found that the strength of the soil-ice interface is higher than that of the thawed soil, and the type of soil affects the strength of the freeze–thaw interface.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on shear characteristics of the silty clay soil-ice interface

Huang

Mao

et al. 2022

Sci Rep

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During the spring thawing, the decrease of soil-ice interface strength by temperature may lead to slope instability. For this reason, some researchers have explored the relationship between temperature and soil-ice interface strength. However, previous studies have not systematically explored the change law of strength at the soil-ice interface from negative temperature to 0 °C. Therefore, direct shear tests were conducted at different shear temperatures and different moisture contents. The effects of temperature and moisture content on strength, cohesion, and internal friction angle are analyzed, while the shear failure mechanism of specimens at different temperatures is discussed according to the location of the shear failure surface. The results show that: Shear properties of soil ice specimens are related to the unfrozen moisture content. The strength of the sample decreases with increasing temperature, and the change in strength is most significant from − 2 to − 0 °C. The strength reduction in this range is from 21.8 to 74.8%, and the higher the moisture content the more obvious this phenomenon is. The shear index tends to decrease with the increase of unfrozen water content, and the greater the increase of unfrozen water, the faster the decrease of both, especially in stage 2. When the temperature is higher than − 5℃, the failure surface is located above the soil-ice interface, and the strength of the specimen is similar to that of the frozen soil. When the temperature is − 10℃, the shear damage surface appears at the soil-ice interface, and the strength of the specimen is determined by the strength of the soil-ice interface.

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“…Ten diferent soil mechanic parameters are endowed in diferent situations. Te mechanical parameters of the numerical model are presented in Table 1, based on a series of triaxial tests [26][27][28]. Te temperature in Table 1 is determined based on the ground temperature data at the Beiluhe section.…”

Section: Model Parameters and Input Seismic Motionmentioning

confidence: 99%

Seismic Behavior of Qinghai-Tibetan Railway Embankment in Permafrost Regions: A Case Study

Chen

Wang

2023

Shock and Vibration

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The temperature is a critical factor that determines the unfrozen water content and ice content in the frozen soil. In view of mechanical properties of the frozen soil depend on the volume of components of the four-phase systems, thus the temperature has a significant impact on the mechanical behaviors and deformation properties. The thermal state of the embankment in permafrost regions has a significant seasonal difference, then the seismic performance of the embankment alters with the season. In addition, the seismic performance is highly influenced by the properties of the earthquake motion, especially the seismic intensity. Combining these factors, a numerical simulation was conducted in this study. In this study, taking a typical section of Qinghai-Tibet Railway as an example, a numerical case study on the seismic behavior of embankment was carried out using the dynamic explicit FEM code ABAQUS/Explicit. The El Centro excitation with different intensities was performed in numerical analysis and two distinct thermal states of the embankment in extreme cold and warm days were considered as well. The seismic behaviors of the embankment, including the acceleration responses, the strain response, and the displacement response, were studied effectively. This paper proposes approaches and methods to study the seismic failure mechanism of the infrastructures, and the results can serve as a scientific basis for resisting earthquakes and preventing disasters in cold regions.

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Strength properties of ice-rich frozen silty sands under uniaxial compression for a wide range of strain rates and moisture contents

Cited by 28 publications

References 15 publications

Experimental Study on the Characteristics of the Failure Strain Energy Density of Undisturbed Ice-Rich Frozen Clay

Experimental Study on the Characteristics of the Failure Strain Energy Density of Undisturbed Ice-Rich Frozen Clay

Experimental study on shear characteristics of the silty clay soil-ice interface

Seismic Behavior of Qinghai-Tibetan Railway Embankment in Permafrost Regions: A Case Study

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