The strength and deformation behaviour of model adfreeze and grouted piles in saline frozen soils

Biggar, Kevin W.; Sego, David C.

doi:10.1139/t93-027

Cited by 29 publications

(10 citation statements)

References 22 publications

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“…The direct shear test is a conventional way to research the interface properties between frozen soil and structure, which has been accepted by many scholars (Liu et al, 2014;Aldaeef et al, 2018;Yazdani., 2019). Biggar et al (1993) investigated the interface freezing strength between bored pile and saline permafrost through field test in Canadian, it is found that the salt content of frozen soil and temperature affected the freezing strength of frozen soil-pile interface by changing the unfrozen water content in the frozen soil around the pile. Ueda et al (2004) conducted the direct shear test to research the mechanical properties of frozen soil-steel plate interface, the test results showed that the freezing strength of frozen sand-steel plate interface and frozen clay-steel plate interface increase with increasing normal stress, the frozen sand-steel plate interface increase rate is more obvious.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation research on the mechanical behavior of ice-frozen soil interface

Shi

Zhu

2023

Preprint

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As the weakest segment within frozen soil, the interface between ice and frozen soil undertakes the link of load transmission. The mechanical parameters between ice and frozen soil influence the deformation and strength of frozen soil. To investigate the mechanical behaviors of ice-frozen soil interface, the cryogenic direct shear tests were carried out and the deformation, strength properties of interface were analyzed. The shear stress of interface was described by generalized hyperbolic model and the physical meaning of the model parameters were defined. Based on the generalized hyperbolic model, the shear stiffness of interface was derived. The effect of temperature on the strength, shear stiffness of interface under different initial moisture contents, initial void ratios and normal stresses were discussed. The three-dimensional finite element model was established using COMSOL Multiphysics, and the mechanical behaviors of ice frozen soil interface were researched.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation research on the mechanical behavior of ice-frozen soil interface

Shi

Zhu

2023

Preprint

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“…The freezing strength between the frozen soil and pile interface plays an important role in foundation stability, especially in group pile foundations. Biggar [12] studied the effects of temperature, salt, and other factors on the shear properties of the concrete-grouted pile-soil interface. Shi [13] presented results from cryogenic direct shear tests and an elastoplastic model based on damage at the ice-frozen soil interface.…”

Section: Introductionmentioning

confidence: 99%

Impact of Climate Change on the Performance of Permafrost Highway Subgrade Reinforced by Concrete Piles

Wang

Zhao

Mao

et al. 2023

Future Transportation

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Climate change has a detrimental impact on permafrost soil in cold regions, resulting in the thawing of permafrost and causing instability and security issues in infrastructure, as well as settlement problems in pavement engineering. To address these challenges, concrete pipe pile foundations have emerged as a viable solution for reinforcing the subgrade and mitigating settlement in isolated permafrost areas. However, the effectiveness of these foundations depends greatly on the mechanical properties of the interface between the permafrost soil and the pipe, which are strongly influenced by varying thawing conditions. While previous studies have primarily focused on the interface under frozen conditions, this paper specifically investigates the interface under thawing conditions. In this study, direct shear tests were conducted to examine the damage characteristics and shear mechanical properties of the soil-pile interface with a water content of 26% at temperatures of −3 °C, −2 °C, −1 °C, −0.5 °C, and 8 °C. The influence of different degrees of melting on the stress–strain characteristics of the soil-pile interface was also analyzed. The findings reveal that as the temperature increases, the shear strength of the interface decreases. The shear stress-displacement curve of the soil-pile interface in the thawing state exhibits a strain-softening trend and can be divided into three stages: the pre-peak shear stress growth stage, the post-peak shear stress steep drop stage, and the post-peak shear stress reconstruction stage. In contrast, the stress curve in the thawed state demonstrates a strain-hardening trend. The study further highlights that violent phase changes in the ice crystal structure have a significant impact on the peak freezing strength and residual freezing strength at the soil-pile interface, with these strengths decreasing as the temperature rises. Additionally, the cohesion and internal friction angle at the soil-pile interface decrease with increasing temperature. It can be concluded that the mechanical strength of the soil-pile interface, crucial for subgrade reinforcement in permafrost areas within transportation engineering, is greatly influenced by temperature-induced changes in the ice crystal structure.

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“…As the backfill of the foundation, the calcareous sand can not only shorten the construction period but also save landfill resources, which is of great significance for the development of the modern marine economy [ 16 ]. Reviewing literature revealed that the studies on the bearing characteristics of pile foundation mainly focuses on clay [ 17 , 18 , 19 ], ordinary sand [ 20 , 21 , 22 ], loess [ 23 ], saline soil [ 24 ]. and other areas [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

Luo

Lei

et al. 2022

Materials

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Reviewing literature revealed that the studies on the bearing characteristics of pile foundations mainly focuses on clay, ordinary sand, loess, saline soil, and other areas. However, few studies on the bearing characteristics of the pile foundation in calcareous sand were conducted. Besides, existing traditional studies ignored the variation of soil compression modulus with depth, and the effect of void ratio on the transverse bearing characteristics of the pile foundation in a calcareous sand area were not well understood. In response of these problems, this study conducted a theoretical investigation on the transverse bearing characteristics of the pile foundation in a calcareous sand area. The transverse bearing characteristics of the pile foundation were derived based on the Pasternak foundation model and the Winkler foundation model, incorporating the heterogeneous distribution of compressive modulus with buried depth. The calculation results of the Pasternak foundation model are closer to the observed results than the Winkler foundation model. Therefore, the following research on the transverse bearing characteristics of the pile foundation in the calcareous sand area adopts the Pasternak foundation model. Then, the effects of the pile length, pile diameter, pile elastic modulus, horizontal load, bending moment, and void ratio on the transverse bearing characteristics of the pile foundation in a calcareous sand area were thoroughly analyzed. Furthermore, the difference between the transverse bearing characteristics of the pile foundation in a calcareous sand area and a quartz sand area was discussed. Results show that the horizontal displacement of the pile top in a calcareous sand area is greater than the quartz sand area under the same conditions.

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The strength and deformation behaviour of model adfreeze and grouted piles in saline frozen soils

Cited by 29 publications

References 22 publications

Numerical simulation research on the mechanical behavior of ice-frozen soil interface

Numerical simulation research on the mechanical behavior of ice-frozen soil interface

Impact of Climate Change on the Performance of Permafrost Highway Subgrade Reinforced by Concrete Piles

The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

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