In situ monitoring of temperature and deformation fields of a tunnel cross passage in Changzhou Metro constructed by AGF

Zhan, Zhi-Xiang; Cui, Zhen-Dong; Yang, Ping; Zhang, Ting

doi:10.1007/s12517-020-05285-y

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…The temperature has a direct influence on the strength and thickness of the frozen soil curtain; therefore, the soil temperature is generally used to judge the physical state of the soil in practical engineering [12][13][14]. In order to understand the distribution of the soil temperature field during the construction process of AGF, researchers have conducted extensive research on this issue either based on field monitoring data or finite element software [15][16][17][18][19]. The AGF construction process is characterized by complex environmental factors such as groundwater seepage, freezing pipe placement, and initial ground temperature, all of which have an impact on the soil temperature field.…”

Section: Introductionmentioning

confidence: 99%

Study on Temporal and Spatial Variation in Soil Temperature in Artificial Ground Freezing of Subway Cross Passage

Zou

Xia

et al. 2023

Sustainability

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Temperature is the fundamental variable used in artificial ground freezing (AGF) design to assess the frozen curtain’s state and carry out an analysis of its mechanical behavior. Therefore, it is important to appropriately understand the temperature variation in the soil during freezing and thawing throughout the construction process of AGF. In this paper, a soil physical state analysis model was established to obtain the one-dimensional distribution curve of the soil temperature field and the temperature variation curve of the soil with temporal, which can be used to explore the soil temperature characteristics during the construction of AGF, so as to scientifically evaluate the physical state of frozen soil and reduce the construction risk. The soil can be divided into three zones during the construction process of AGF, namely the frozen zone, the frozen fringe, and the unfrozen zone. Additionally, Hangzhou muddy silty clay was selected for the indoor model test to verify the correctness of the analytical model. The results show the following: (1) Due to the influence of the latent heat of the phase change, the physical state and temperature of the soil on both sides of the frozen fringe are not the same. It is not appropriate to use the same temperature index to judge whether the soil is frozen or thawed in the project. (2) For Hangzhou muddy silty clay, the freezing index is −1 °C, and the thawing index is 0.9 °C. The research results can provide some guidance for the judgment of the soil state during the AGF of subway cross passages.

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Section: Introductionmentioning

confidence: 99%

Study on Temporal and Spatial Variation in Soil Temperature in Artificial Ground Freezing of Subway Cross Passage

Zou

Xia

et al. 2023

Sustainability

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“…Cross passages, as the important auxiliary structures linking the double-line tunnels, play a vital role in the accident evacuation, fire rescue, operating ventilation, and other functions in tunnels [1][2][3][4][5]. However, when lateral openings are broken out on shield tunnels to construct cross passages, the stress and deformation characteristics of the structure will become complicated, due to the flexible features of shield tunnels.…”

Section: Introductionmentioning

confidence: 99%

“…The research methods to investigate the mechanical characteristics, e.g., stress state, deformation pattern of shield tunnels include theoretical analysis [13][14][15], numerical simulations [1,2,16,17], field monitoring [2][3][4][5], and model tests [18][19][20][21]. The combination of the cross passages and main tunnels is a complex three-dimensional structure, which is unrealistic to utilize classical theoretical methods such as beam-spring models or homogeneous ring models to perform analysis.…”

Section: Introductionmentioning

confidence: 99%

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Yuan

Luo

et al. 2022

Applied Sciences

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To investigate the mechanical characteristics of shield tunnels when openings are made for the construction of cross passages, a series of centrifugal model tests were conducted. The segmental features of the shield tunnel were simulated in the tests, and the influence of different types of openings, namely, rectangular opening, small circular opening, and big circular opening was compared. External earth pressures, structural deformations, dislocations, and structural stresses were monitored during the tests, while the influence of different buried depths was also investigated. The results show that (1) soil arching effect occurred in the overlying soil due to the deformation of the tunnel, and the earth pressure reduction coefficients can guide the tunnel structural design; (2) vertical deformations of the main tunnel and the dislocations between adjacent rings increased with the opening sizes significantly; (3) significant stress concentration occurred close to the openings, and the compressive stress at the inner surface may even exceed the limit strength of the concrete. In summary, the adverse responses of the tunnel increased with the increase of the buried depth and the opening size. Targeted measures should be taken, such as temporary support, longitudinal connections, and high-strength materials near the openings.

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Artificial Freezing for by-Pass of Subway Tunnel

Cui

Zhang

Zhan

et al. 2020

Dynamics of Freezing-Thawing Soil Around Subway Shield Tunnels

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In situ monitoring of temperature and deformation fields of a tunnel cross passage in Changzhou Metro constructed by AGF

Cited by 13 publications

References 19 publications

Study on Temporal and Spatial Variation in Soil Temperature in Artificial Ground Freezing of Subway Cross Passage

Study on Temporal and Spatial Variation in Soil Temperature in Artificial Ground Freezing of Subway Cross Passage

Centrifugal Model Test Study on the Mechanical Characteristics of Shield Tunnels Influenced by Different Types of Openings for Cross Passages

Artificial Freezing for by-Pass of Subway Tunnel

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