Numerical analysis of heat transfer between air inside and outside the tunnel caused by piston action

Jiang, Haiqiang; Niu, Fujun; Ma, Qinguo; Su, Wenji; Wang, Enliang; He, Junlin

doi:10.1016/j.ijthermalsci.2021.107164

Cited by 27 publications

(7 citation statements)

References 26 publications

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“…Therefore, the main influencing factors of tunnel freezing damage are summarized: groundwater, temperature, and surrounding rock properties. Moreover, the disaster factors of freezing damage are quantitatively evaluated by the analytic hierarchy process (AHP) [22,23].…”

Section: The Freezing Damage To the Lining Interfacementioning

confidence: 99%

“…This method has obvious limitations due to the influence of different geological conditions on different tunnel projects [8,[11][12][13][14][15][16][17][18]. (2) When analyzing the causes of freezing damage, these studies were mainly based on the existing engineering experience and lacked quantitative evaluation of the impact of various factors on the extent of freezing damage, which resulted in a significant limitation when they were used to guide the construction of other engineering projects [19][20][21][22][23][24]. Therefore, in tunnels in cold regions, the quantitative analysis of the factors and importance of inducing freezing damage should be paid attention to.…”

Section: Introductionmentioning

confidence: 99%

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Freezing Damage to Tunnels in Cold Regions and Weights of Influencing Factors

Shen

Dong

et al. 2022

Sustainability

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Concrete materials are widely used in tunnel engineering. In China, the cold regions have gradually become the main area for highway and railway construction. Affected by high altitude, low temperature, turbulent wind, and other conditions, freezing damage, such as tunnel icing, occurs in concrete materials, which seriously affects the quality and operational safety of tunnels in cold regions. Therefore, it is necessary to carry out a quantitative analysis of various factors affecting freezing damage to protect concrete materials in tunnels. This paper summarizes various freezing damage phenomena in tunnels in cold regions and divides them into three types: water seepage and hanging ice type freezing damage, lining interface type freezing damage, and tunnel foundation ice accumulation type freezing damage. Based on the qualitative evaluation of each factor, the affiliation of each factor was divided. Then, the influence weight of each factor on freezing damage was obtained through the analytic hierarchy process, and then each factor was ranked. This study is helpful to the selection of anti-freezing measures for tunnels in cold regions.

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Section: The Freezing Damage To the Lining Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Freezing Damage to Tunnels in Cold Regions and Weights of Influencing Factors

Shen

Dong

et al. 2022

Sustainability

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“…Freeze-thaw cycles(FTCs) as a commonly weathering action that can occur more than 100 times within a year for the geological body in cold regions [ 1 ], which can change the properties of the soils and cause the engineering problems. Such as frost heave deformation [ 2 , 3 ] and thaw slumping [ [4] , [5] , [6] ], frost heave cracking of lining [ [7] , [8] , [9] ] and thermokarst [ 10 , 11 ]. Besides, the FTCs also can trigger many disasters including landslides and debris flow [ [12] , [13] , [14] ].…”

Section: Introductionmentioning

confidence: 99%

Effect of repeated freeze-thaw cycles on mechanical properties of clay

Jiang,

Han,

Liu

et al. 2024

Heliyon

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“…In recent years, due to the influence of global warming, the freeze-thaw (F-T) cycles have been significantly strengthened, leading to changes in soil cohesion in the permafrost regions of the QTP, which affects the shear strength of permafrost, reduces the stability of slopes, and triggers a certain degree of damage and destabilization of infrastructure construction such as highways and railways in the cold region [6]. In particular, in recent years, with the continuous increase in infrastructure construction such as railways and highways in the permafrost region of the QTP, a series of disaster problems such as retrogressive thaw slump, solifluction, and thermokarst have occurred due to permafrost degradation [6][7][8][9][10][11], which has resulted in certain impacts and potential threats on adjacent transportation trunk lines and infrastructure facilities. Based on this, in order to ensure the coordinated development between the construction of infrastructure and the protection of the ecological environment in the region, it is necessary to carry out research on the shear characteristics of soil in permafrost regions under the action of F-T cycles.…”

Section: Introductionmentioning

confidence: 99%

Study on Shear Characteristics of Herbs Plant Root–Soil Composite System in Beiluhe Permafrost Regions under Freeze–Thaw Cycles, Qinghai–Tibet Highway, China

Wang,

Hu,

et al. 2024

Sustainability

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In order to study the root–soil composite system shear characteristics under the action of freeze–thaw cycles in the permafrost regions along the Qinghai–Tibet Highway (QTH) from the Beiluhe–Tuotuohe (B-T) section, the slopes in the permafrost regions along the QTH from the B-T section were selected as the object of the study. The direct shear test of root–soil composite systems under different amounts of freeze–thaw (F-T) cycles and gray correlations were used to analyze the correlation between the number of F-T cycles, water content, root content, and the soil shear strength index. The results show that the cohesion of the soil in the area after F-T cycles exhibits a significant stepwise decrease with an increase in F-T cycles, which can be divided into three stages: the instantaneous stage (a decrease of 46.73–56.42%), the gradual stage (a decrease of 14.80–25.55%), and the stabilization stage (a decrease of 0.61–2.99%). The internal friction angle did not exhibit a regular change. The root–soil composite system showed significant enhancement of soil cohesion compared with soil without roots, with a root content of 0.03 g/cm3 having the most significant effect on soil cohesion (increasing amplitude 65.20–16.82%). With an increase in the number of the F-T cycles, while the water content is greater than 15.0%, the greater the water content of the soil, the smaller its cohesion becomes. Through gray correlation analysis, it was found that the correlation between the number of F-T cycles, water content, root content, and soil cohesion after F-T cycles were 0.63, 0.72, and 0.66, respectively, indicating that water content had the most significant impact on soil cohesion after F-T cycles. The results of this study provide theoretical support for further understanding the variation law of the shear strength of root–soil composite systems in permafrost regions under F-T cycles and the influencing factors of plant roots to enhance soil shear strength under F-T cycles, as well as for the scientific and effective prevention and control of retrogressive thaw slump in the study area, the QTH stretches across the region.

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Numerical analysis of heat transfer between air inside and outside the tunnel caused by piston action

Cited by 27 publications

References 26 publications

Freezing Damage to Tunnels in Cold Regions and Weights of Influencing Factors

Freezing Damage to Tunnels in Cold Regions and Weights of Influencing Factors

Effect of repeated freeze-thaw cycles on mechanical properties of clay

Study on Shear Characteristics of Herbs Plant Root–Soil Composite System in Beiluhe Permafrost Regions under Freeze–Thaw Cycles, Qinghai–Tibet Highway, China

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