Reliability research on the 5-cm-thick insulation layer used in the Yuximolegai tunnel based on a physical model test

Feng, Qiang; Jiang, Binsong; Zhang, Qiang; Wang, Gang

doi:10.1016/j.coldregions.2016.01.001

Cited by 53 publications

(19 citation statements)

References 15 publications

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“…In this section, we show how placing an insulation layer between the tunnel lining and the air affects the temperature distribution. As mentioned, the insulation layer thickness is only 5 cm, similar to what was suggested by Feng et al [26]. We expect that the insulation layer hinders the temperature to migrate into surrounding rocks.…”

Section: Temperature Results With Insulation Layersupporting

confidence: 84%

Impact of Tunnel Temperature Variations on Surrounding Rocks in Cold Regions

Zhang

Dai

et al. 2019

Period. Polytech. Civil Eng.

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Temperature is an important factor in designing and maintaining tunnels, especially in cold regions. We present three-dimensional numerical simulations of tunnel temperature fields at different temperature conditions. We study the tunnel temperature field in two different conditions with relatively low and high ambient temperatures representing winter and summer of northeast China. We specifically study how these temperature conditions affect tunnel temperature and its migration to surrounding rocks. We show how placing an insulation layer could affect the temperature distribution within and around tunnels. Our results show that the temperature field without using an insulation layer is closer to the air temperature in the tunnel, and that the insulation layer has shielding effects and could plays an important role in preventing temperature migration to surrounding rocks. We further analyzed how thermal conductivity and thickness of insulation layer control the temperature distribution. The thermal conductivity and thickness of insulation layer only affect the temperature of the surrounding rocks which are located at distances below ~20 m from the lining.

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Section: Temperature Results With Insulation Layersupporting

confidence: 84%

Impact of Tunnel Temperature Variations on Surrounding Rocks in Cold Regions

Zhang

Dai

et al. 2019

Period. Polytech. Civil Eng.

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“…e interface shear behaviors of the frozen soil-structure have been widely investigated using field tests [7][8][9][10][11][12], laboratory tests [3,6,[13][14][15][16][17], and numerical simulations or theoretical analyses [18][19][20][21]. Liu et al [14] investigated the shear behavior of frozen soil-concrete interface using a temperature-controlled direct shear test system, and their results showed that temperature and moisture content had a great effect on the peak shear strength but had little effect on the residual shear strength.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Concrete‐Frozen Soil Interface from Direct Shear Test Results

Xiong

et al. 2021

Advances in Civil Engineering

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The shear behaviors of concrete-frozen soil interface are important for analyzing the performance of engineering structures buried in the frozen ground. In this paper, a series of direct shear tests were carried out to determine the concrete-soil interface behaviors at different test temperatures (19°C, −1°C, −3°C, and −5°C) and initial water contents (9.2%, 13.1%, 17.1%, and 20.8%) of soils. The interface shear behaviors, including the shear stress versus horizontal displacement, interface cohesion, and interface friction coefficient, were analyzed based on the test results. Then, a simple, nonlinear model was proposed and verified for the interface shear behaviors. The results show that the effect of initial water content and test temperature on the interface shear behavior is significant, and the peak stress increases with the increasing initial water content and decreasing test temperature. The interface cohesion is sensitive to the test temperature and initial water content, while the interface friction coefficient is insensitive to both the factors. The parameters of the simple nonlinear model can be gained by back-analyzing the test results. The predictions made by the proposed model are found to be in good agreement with the experimental results.

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“…Changes in the ground-level atmospheric temperature directly result in temperature fluctuations of the surrounding rock above the tunnel, and the airflow in the tunnels acquired from the ground atmosphere also exhibits correspondingly pronounced annual cycle temperature variations. The synergistic effect of these two temperature fluctuations complicates the heat transfer mechanism of the surrounding rock of the tunnel (Barla et al 2016;Feng et al 2016;Tan et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Thermal Hazards in Surrounding Rock of Subway Tunnel Under Dual Periodic Temperature Boundaries: A Case Study

Liu¹,

Huang²,

Shi³

et al. 2020

Preprint

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Thermal hazards of the surrounding rock of subway tunnels are becoming apparent, in which the heat transfer in the surrounding rock plays a crucial role. Due to the shallow buried depth, the subway tunnel encounters a more complicated heat exchange under the duplicate effects of periodic temperature fluctuation of ground atmosphere and periodic temperature variation of tunnel wind, but this issue has not been fully addressed. In this work, a transient heat transfer model of tunnel surrounding rock based on dual periodic temperature boundaries was established. A solver was developed to estimate the temperature rise and heat transfer of surrounding rock. The correctness of this model was then verified by comparing with previous empirical values and semi-empirical equations. The results show that the temperatures of the surrounding rock at different depths still fluctuate following the simple harmonic waves, and there are some regions that are heavily affected by the duplicate effects, such as the overlying strata of the tunnel. The surrounding rock generally exhibits heat storage in annual cycle, but the total heat storage decreases year by year until it tends to stabilize. Furthermore, the shallower the tunnel is buried, the greater the influence of ground temperature and the higher the temperature rise in the tunnel surrounding rock. This research provides an alternative approach to determine the heat storage of tunnel surrounding rock and evaluates the process of thermal disaster manifestation of subway.

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Reliability research on the 5-cm-thick insulation layer used in the Yuximolegai tunnel based on a physical model test

Cited by 53 publications

References 15 publications

Impact of Tunnel Temperature Variations on Surrounding Rocks in Cold Regions

Impact of Tunnel Temperature Variations on Surrounding Rocks in Cold Regions

Modeling of Concrete‐Frozen Soil Interface from Direct Shear Test Results

Estimation of Thermal Hazards in Surrounding Rock of Subway Tunnel Under Dual Periodic Temperature Boundaries: A Case Study

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