Centrifugal modelling of foundation frost heave and thaw settlement

Chen, Xiangsheng; Luo, Xiaogang; Pu, Jialiu; Yin, Kun

doi:10.1201/9781003078654-24

Cited by 2 publications

(3 citation statements)

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“…𝑊 𝑒 of the thawed soil is calculated by Eq. (13). Whether there are any potential rules about 𝑊 𝑒 needs further study.…”

Section: 𝑀 𝑡𝑜𝑡𝑎𝑙 = 𝑀mentioning

confidence: 99%

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A novel theoretical model to predict thawing settlement of clayey permafrost

Qu,

Tang,

Zhao

et al. 2024

Preprint

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As infrastructure construction increases in cold climates, the thermal deformation of frozen soil needs to be taken seriously. In contrast to frost heave, thawing settlement is another type of thermal deformation less attention received in recent years but has yet caused significant harm to early infrastructure like roadways, railways, and pipelines in cold climates. Engineers attempted to foresee the thawing settlement of frozen soil before design, but there was no universally accepted and satisfactory theoretical model for the prediction. Based on the four-phase charting of frozen soil and taking into account the change of frozen soil systems experiencing thawing settlement, an original theoretical model is developed. The derivation offers seven postulates, induces three new factors that describe the thermal-hydraulic- structural characteristics of soil, and attempts to take specimen scale into account. The innovative model adopts initial water content and dry density to forecast the thawing settlement coefficient. Thawing settlement data of clayey permafrost from various regions of Northeast China were substituted for verification. The model demonstrates that in addition to the initial water content and dry density, the unfrozen water content, water holding capacity, and skeletal structure maintenance properties of frozen soil also affect the thawing settlement of frozen clayey permafrost but with different weights. The model also explains some essence of thawing settlement distribution problems. Finally, a happening probability list of various thawing settlement coefficients is provided based on the probability of various combinations of water-holding capacity and skeleton structure.

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“…𝑊 𝑒 of the thawed soil is calculated by Eq. (13). Whether there are any potential rules about 𝑊 𝑒 needs further study.…”

Section: 𝑀 𝑡𝑜𝑡𝑎𝑙 = 𝑀mentioning

confidence: 99%

“…In classical soil mechanics [13], the approximately simplified relationship between void ratio 𝑒 and pressure 𝑃 which is friendly to engineering can be expressed as…”

Section: The Derivation and Classification Of The Thawing Settlement ...mentioning

confidence: 99%

A novel theoretical model to predict thawing settlement of clayey permafrost

Qu,

Tang,

Zhao

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Chen [41] carried out a centrifugal model test with the freezing project of the cross passage of the Huangpu River Tunnel to simulate the frost heave phenomenon of sandy clay under artificial freezing conditions. Ning [42] gave an empirical regression equation for frost heave and thawing settlement through freezing model tests and used random medium theory to predict the frost heave deformation of the formation.…”

Section: Frost Heave and Aw Settlement Mechanismmentioning

confidence: 99%

Research on the Ground Subsidence Mechanism of Cross Passage Caused by Freezing Method Construction

Zhang

Cheng

et al. 2021

Advances in Civil Engineering

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At present, the built or newly built underground structures are mostly concentrated in developed areas along the coast, lakes, and rivers, while deep soft soil is widely distributed in these areas. The cold heat treatment method is one of the advanced foundation treatments and has broad application prospect. However, geothermal exchange and temperature field change are complex Stefan problems with mobile boundaries, internal heat sources, and phase changes. It is important to determine the freezing area and freezing temperature reasonably under the premise of ensuring the safety of the frozen construction. Therefore, this paper summarizes the research methods of freezing method construction of cross passage and introduces the research on the constitutive model of freezing undisturbed soil, the theory of freezing wall calculation, and the evolution mechanism of the temperature field. Then, a brief evaluation is made in view of the lack of research, and the development direction of this field is put forward with the research characteristics. It is to deepen the understanding of the deformation mechanism of cross passage embedded in soft soil caused by the freezing and melting.

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Centrifugal modelling of foundation frost heave and thaw settlement

Cited by 2 publications

References 0 publications

A novel theoretical model to predict thawing settlement of clayey permafrost

A novel theoretical model to predict thawing settlement of clayey permafrost

Research on the Ground Subsidence Mechanism of Cross Passage Caused by Freezing Method Construction

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