Stress–Strain Model for Freezing Silty Clay under Frost Heave Based on Modified Takashi’s Equation

Li, Geng; Cong, Shengyi; Luo, Jun; Xue, Ling; Du, Xiuli; Yuan, Yu

doi:10.3390/app10217753

Cited by 3 publications

(3 citation statements)

References 20 publications

(27 reference statements)

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“…e uniaxial compressive strength of frozen red clay increases with the decrease of temperature. When the temperature field in the soil changes, water migration will occur [29]. e strength growth rate is different at each stage, the strength increases most obviously at −2 °C∼−10 °C, and the effect of temperature on strength decreases between −10 °C∼−15 °C.…”

Section: The Relationship Between Uniaxial Strength and Temperaturementioning

confidence: 99%

Analysis of Damage Constitutive Model for Frozen Red Clay under Uniaxial Compression

Lin

Zhao

2022

Advances in Materials Science and Engineering

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At present, it is in the peak period of infrastructure construction in western China, and due to the natural climate, the soil has been frozen for a long time, but there is little research on frozen red clay at present. Therefore, it is necessary to further study the mechanical properties of frozen red clay. In this paper, taking the remolded red clay as the test material, the change characteristics of uniaxial compression and uniaxial creep of frozen soil under different test factors are studied by artificial freezing method, and the damage theory is introduced to analyze the test results. The results of uniaxial compression test of frozen soil show that temperature has a great influence on the uniaxial compressive strength, and the compressive strength increases with the decrease of temperature, and the damage theory is introduced. It is found that the initial damage stress increases with the decrease of temperature, while the initial strain changes little with temperature. A damage constitutive equation which can well reflect the whole damage process of frozen red clay is established. The experimental research results of this paper can provide some theoretical reference for the engineering of soil quality for freezing red clay.

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Section: The Relationship Between Uniaxial Strength and Temperaturementioning

confidence: 99%

Analysis of Damage Constitutive Model for Frozen Red Clay under Uniaxial Compression

Lin

Zhao

2022

Advances in Materials Science and Engineering

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“…Wang et al conducted a lot of freezing tests of unsaturated soil, considering the influence of fine content and degree of saturation [9]. Geng et al examined coarse aggregate differently and discovered that the coagulation potential decreased with the gradual increase in porosity of coarse aggregate and confirmed that the coagulation potential should be considered because of fine-grain content [10]. Tang et al proposed that the range of fine soil and freezing conditions have the greatest influence on the frost heave sensitivity of water-saturated sand and gravel during freezing [11].…”

Section: Introductionmentioning

confidence: 99%

Frost Heaving Properties of Gravelly Soils in Alpine Seasonally Frozen Regions

Chen

Zhang

et al. 2022

Advances in Materials Science and Engineering

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To investigate the frost heaving properties of gravelly soil in alpine seasonally frozen regions and provide a foundation for the antifrost heaving design of the foundation tower in the Manzhouli 500 kV electrical transmission line. First, particle analysis and compaction tests were used to assess the basic characteristics of gravelly soil. Then, to investigate, a unidirectional freezing test of graded sand was performed to analyze the regularity and properties of the frozen process of graded sand. The test results demonstrate that the temperature gradient and the number of freeze-thaw cycles considerably affect the freezing of graded sand. The greater the temperature gradient and the number of freeze-thaw cycles, the greater the frost heave. In the freezing process, graded sand with zero fine-grain content exhibits obvious freezing shrinkage and thawing settlement. Still, the frost heave of sand is small. The frozen damage of graded sand is not caused by frost heaving deformation but by the deterioration of soil structure and the decrease of bearing capacity under hydrothermal coupling. Finally, experimental research is used to propose prevention and control measures for frost heave of power transmission and transformation projects.

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“…Because of the overall promotion of transportation, the development of highways and railways has rapidly developed, and the number of urban deep foundation pit projects has correspondingly increased. In China, frozen soil is widely distributed [1,2]. In seasonally frozen soil areas, the foundation pit active layer of the soil experiences repeated freeze thaw action, considerably affecting the stability of related projects such as building sites and subway stations.…”

Section: Introductionmentioning

confidence: 99%

Performance of Prestressed Anchor Cables Supporting Deep Foundation Pit of a Subway Station during Spring Thaw

2022

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Based on the deep foundation pit for a subway station in Changchun (China), a 3D numerical model of water–heat coupling in a prestressed pile anchor system was established to determine its performance in freezing and thawing seasons in alpine areas. Its reliability was confirmed using field monitoring data on the prestressed anchor cables, which demonstrated changes in surface subsidence, anchor cable axial force, and pile horizontal displacement during spring thaw. The results demonstrated different degrees of elevation of the ground surface at the beginning of the spring thaw depending on whether the ground surface was at 2, 5, or 8 m from the pit excavation surface. Moreover, they demonstrated the occurrence of melting and surface subsidence when the temperature rises above 0°C, and that the axial force of the anchor cables fluctuates at the beginning of spring thaw but stabilizes in its middle and late stages. The phenomenon of pile horizontal displacement during the spring thaw could be roughly divided into three stages, with the second stage resulting in the most significant displacement. These results can provide certain reference for deep foundation pit projects in alpine areas.

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Stress–Strain Model for Freezing Silty Clay under Frost Heave Based on Modified Takashi’s Equation

Cited by 3 publications

References 20 publications

Analysis of Damage Constitutive Model for Frozen Red Clay under Uniaxial Compression

Analysis of Damage Constitutive Model for Frozen Red Clay under Uniaxial Compression

Frost Heaving Properties of Gravelly Soils in Alpine Seasonally Frozen Regions

Performance of Prestressed Anchor Cables Supporting Deep Foundation Pit of a Subway Station during Spring Thaw

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