Model test and numerical simulation of frost heave during twin-tunnel construction using artificial ground-freezing technique

Cai, Haibing; Li, Sheng; Yu, Lintao; Yao, Zhishu; Cheng, Hua

doi:10.1016/j.compgeo.2019.103155

Cited by 68 publications

(19 citation statements)

References 20 publications

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“…(i) Chilled brine extracts heat from soil, and then, pore water is frozen to ice. The similarity principle of a temperature field [48,49] can be represented as:…”

Section: Modeling Testmentioning

confidence: 99%

“…where w is the initial water content of soil and w 0 is the unfrozen water content of frozen soil. Because the process of water migration is similar to thermal conduction [49], the similarity ratio of a humidity field is approximately equal to that of a temperature field. (ii) Freezing and excavation cause the deformation of soil.…”

Section: Modeling Testmentioning

confidence: 99%

“…(ii) Freezing and excavation cause the deformation of soil. Here, the stress-displacement field can be expressed in a dimensionless form [49,51], that is:…”

Section: Modeling Testmentioning

confidence: 99%

“…It is not suitable for a large-scale model. Therefore, a uniform load was applied to soil in order to meet the similarity ratio of density [49,51]. In addition, in consideration of the overlying weight, a required loading force was determined to be 800 kN, as shown in Figure 2b.…”

Section: Modeling Testmentioning

confidence: 99%

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Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Wang

et al. 2019

Applied Sciences

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The high risk of metro tunnels that are underneath buildings in a water-rich layer has received much attention. The base slab of an upper structure deforms due to frost heave and settlement, which needs to be predicted before freezing and excavation. In this paper, simulation experiments with a similarity ratio of 1/25 were performed based on an engineering project where two tunnels underpass a running station through an artificial ground freezing method. The displacement of upper structures was analyzed under simultaneous and sequential freezing modes, with a simple formula proposed to estimate the frost heave in closely underpassing projects. It is shown that, under freezing and excavation stages, the base slab displacement displays a zigzag shape. These results are instructive to the construction of underpassing projects in a water-rich layer.

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“…(i) Chilled brine extracts heat from soil, and then, pore water is frozen to ice. The similarity principle of a temperature field [48,49] can be represented as:…”

Section: Modeling Testmentioning

confidence: 99%

Section: Modeling Testmentioning

confidence: 99%

“…(ii) Freezing and excavation cause the deformation of soil. Here, the stress-displacement field can be expressed in a dimensionless form [49,51], that is:…”

Section: Modeling Testmentioning

confidence: 99%

Section: Modeling Testmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Wang

et al. 2019

Applied Sciences

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“…В работах [6,7] отмечается, что морозное пучение приводит к неравномерному распределению напряжений в трубопроводе и вызывает его изгиб. Авторами работ [8][9][10] рассматривается изменение напряженно-деформированного состояния грунта при возведении туннеля с использованием искусственного замораживания. Показано, что морозное пучение приводит к деформированию дневной поверхности и перераспределению нагрузки на крепь туннеля от окружающего грунта.…”

Section: Introductionunclassified

Experimental and theoretical study of mechanical deformation of freezing saturated soil

Zhelnin

Prokhorov

Kostina

et al. 2019

PNRPU Mechanics Bulletin

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An intensive development of infrastructure in the far North and application of the artificial ground freezing technology for construction of civil and industrial buildings require an accurate description of frost heave caused by freezing of pore water in soils. It is important to understand this processes at the developing stage for the aim of safety exploitation of constructions. The present work is devoted to an experimental and theoretical study of the frost heave in laboratory samples of water saturated sand. Artificial freezing of the sample is performed in a chest freezer. During freezing measurements of temperature and strain are carried out by a control system consisting of a set of thermocouples and fiber optic sensors based on Bragg gratings. To analyze the obtained experimental data, a thermo-hydro-mechanical model has been developed. Water saturated soil is supposed to be three phase porous media consisting of a drained skeleton, water and ice. The model includes the energy conservation equation, the mass balance equations for moisture and ice content, the equilibrium equation and the constitutive relations taking into account an influence of the phase transition of water on heat and mass transfer and the additional volumetric strain. The numerical solution of the nonlinear partial differential equations of the model is performed by the finite element method. The feature of the model is a possibility to take into account the crystallization kinetics on the frost heave of the freezing saturated soil. As a result of the study, a good qualitative and quantitative agreement between a temperature measurement in the volume of the sample and the results of the simulation has been obtained. A comparison of the fiber-optic sensors readings with the results of the numerical simulation has shown that the calculated values are slightly deviated from the experimental ones. On the basis of the measurements analysis and the numerical results it can be concluded that the frost heave proceeds in a long time after the phase transition starts within the temperature range below the temperature of water freezing.

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Landslide Research and Technology in Patent Documents

Mikoš

2023

Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022

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Science, Technology, and Innovation play a crucial role in the Sendai Framework for Disaster Risk Reduction 2015–2030 (SF DRR). The International Consortium on Landslides (ICL) initiated the Sendai Landslide Partnerships 2015–2025 as a voluntary commitment to SF DRR. In 2020, the ICL launched the Kyoto 2020 Commitment for Global Promotion of Understanding and Reducing Landslide Disaster Risk (KLC 2020) as a follow-up of the Sendai Landslide Partnerships 2015–2025. Closely related to the above-mentioned Innovation are patents as a form of intellectual property rights and are often used as an innovation assessment parameter. This article reports on a study conducted to look at the patent documents that are available in open-access databases in order to evaluate how well they relate to the field of landslide research and technology. Landslide-related patent documents were extracted using different search terms in the patent document titles, abstracts, claims and/or their general text from the Google Patents, using the Espacenet tools from the European Patent Office, and the Derwent Patent Index inside the Web of Science offered by Clarivate Analytics, respectively. The extracted patent documents were analyzed with regard to the applicant respectively inventor affiliation (academic, non-academic, country of affiliation) and to the technical field of a patent using well-known patent classifications. The most active countries claiming landslide-related patents were recognized. Furthermore, review and research articles in SpringerLink and SCOPUS databases were searched to study how often scientific articles are citing landslide-related patents. The results of the study can be summarized as follow: (i) in the Google Patents database there are 15,000 + landslide-related patent documents, and in the Espacenet and the Derwent Innovation index database 5000+, respectively. In the patents titles, abstracts, and claims, processes are more often used to describe the patent than the technology; (ii) the number of technological (non-science) based patents is higher than that of academic (science-based) patents, with some specific field of applications, where the situation is the opposite; (iii) with regard to the different areas of technology to which landslide-related patent documents pertain, the categories “G-Physics” and “E-Fixed constructions” are clearly prevailing: “G” for debris flows and landslides, and “E” for fallings rocks and mudflows; (iv) the majority of landslide-related patents are filled and/or granted in China, followed by Japan and South Korea, USA and EU member countries—five major emerging economies (called BRICS) are outperforming developed countries, with a very prevailing Chinese contribution; (v) only a fraction of the order of a few one-in-thousands of landslide-related patents documents are cited in journal review and research articles.

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Model test and numerical simulation of frost heave during twin-tunnel construction using artificial ground-freezing technique

Cited by 68 publications

References 20 publications

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Influence of Different Freezing Modes on the Base Slab Displacement of an Upper Structure

Experimental and theoretical study of mechanical deformation of freezing saturated soil

Landslide Research and Technology in Patent Documents

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