scholarly journals Calculation of Soil Natural Temperature Field in Cold Region and Analysis of Influencing Factors

2021 ◽  
Author(s):  
Lantian Yang ◽  
Pengli Ge ◽  
Yanyan Xu ◽  
Guangwen Zeng ◽  
Qingshan Liu ◽  
...  
Keyword(s):  
Temperature Field ◽  
Influencing Factors ◽  
Cold Region ◽  
Natural Temperature

Temperature field characteristics and influencing factors on frost depth of a highway tunnel in a cold region

2020 ◽  
Vol 179 ◽  
pp. 103141
Author(s):  
Xin Zhao ◽  
Hongwei Zhang ◽  
Hongpeng Lai ◽  
Xiaohua Yang ◽  
Xueying Wang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Influencing Factors ◽  
Cold Region ◽  
Highway Tunnel ◽  
Frost Depth

Analysis the Influence of the Thermal Diffusivity of the Soil around Buried Pipe on Soil Physical Property

2013 ◽  
Vol 805-806 ◽  
pp. 552-556
Author(s):  
Ying Xu ◽  
Xiao Yan Liu
Keyword(s):  
Temperature Field ◽  
Thermal Diffusivity ◽  
Soil Temperature ◽  
Temperature Drop ◽  
Physical Property ◽  
Field Soil ◽  
Buried Pipeline ◽  
Buried Pipe ◽  
Soil Physical Property ◽  
Natural Temperature

In chilliness area, the temperature drop of oil in buried pipeline is affected by soil temperature field, and the thermal diffusivity is one of the main of physical property the soil, which affects the temperature drop of oil directly. This paper introduced the test principle of the thermal diffusivity of soil, and researched the influence of thermal diffusivity of soil on the soil physical property, such as soil natural temperature field, soil frozen days, depth of freezing and temperature delay, which can offer theory support for the calculation of hot oil temperature drop in buried pipeline.

Three-Dimensional Numerical Computation for Temperature Field and Insulator of Cold Regions Tunnel

2012 ◽  
Vol 503-504 ◽  
pp. 132-135
Author(s):  
Jin Xing Lai ◽  
Chi Liu ◽  
Guang Long Zhang
Keyword(s):  
Temperature Field ◽  
Three Dimensional ◽  
Longitudinal Direction ◽  
Transient Temperature ◽  
Burial Depth ◽  
Cold Region ◽  
Insulating Layer ◽  
Thermal Insulating ◽  
Longitudinal Length ◽  
Three Dimensional Finite Element

With heat conduction differential equation of the transient temperature field, Galerkin method is adopted to deduce the three-dimensional finite element formula; based on the test result of temperature field, the actual temperature of the environment inside the tunnel shall be exerted on surface of the second lining concrete as load, thus establish the three dimensional computation model of the temperature field of tunnel in cold region. Next, on basis of the model, numerical analysis on cross section of burial depth and longitudinal direction of tunnel in cold region with and without thermal insulating layer, so as to provide theoretical basis for thickness and longitudinal length of thermal insulating layer laid in tunnel of cold region.

scholarly journals Experimental Study on the Temperature Field of Cold Region Tunnel under Various Groundwater Seepage Velocities

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Shiding Cao ◽  
Taishan Lu ◽  
Bo Zheng ◽  
Guozhu Zhang
Keyword(s):  
Temperature Field ◽  
Coupling Effect ◽  
Calculation Model ◽  
Surrounding Rock ◽  
Laboratory Model ◽  
Interface Temperature ◽  
Cold Region ◽  
Seepage Velocity ◽  
Groundwater Seepage ◽  
Tunnel Cross Section

Groundwater seepage significantly affects the temperature field of a cold region tunnel. Laboratory model tests are carried out to evaluate its effects, yielding four main results. First, groundwater seepage can increase tunnel air temperature and decrease the thickness and length of the tunnel insulation layer. Second, groundwater seepage and tunnel ventilation exert a coupling effect on the surrounding rock temperature. This effect is related to the surrounding rock depth. Third, the influence of the groundwater seepage velocity on the temperature of the interface between the lining and surrounding rock demonstrates a spatial difference, and the groundwater seepage leads to an uneven temperature distribution at the interface between the lining and surrounding rock. Furthermore, under groundwater seepage, the shape and size of the tunnel cross section have significant effects on the interface temperature. Fourth, the cold region tunnel has an antifreezing capability that is mainly related to the frost heaving of the surrounding rock and the groundwater seepage velocity. This capability should be fully utilized in the design of cold region tunnels. The experimental data presented can be used to verify the reliability of the theoretical calculation model for tunnel temperatures in cold regions.

Numerical Simulating the Ground Coefficient of Thermal Conductivity in Severe Cold Region

2014 ◽  
Vol 960-961 ◽  
pp. 366-369 ◽  
Author(s):  
Li Bai ◽  
Yan Wang ◽  
Ya Wei Hua
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Temperature Field ◽  
Ground Temperature ◽  
Actual Data ◽  
Transfer Model ◽  
Cold Region ◽  
Unsteady Heat Transfer ◽  
Buried Pipe ◽  
Coefficient Of Thermal Conductivity

The ground coefficient of thermal conductivity is one of the most important parameters of simulating the ground temperature field. The ground coefficient of thermal conductivity of the severe cold region is investigated in this article. Firstly, calculating the ground thermal conductivity with considering the moisture content and porosity; then measuring the thermal conductivity of the 1.5 Meter depth; finally, simulating the unsteady heat transfer model of the shallow buried pipe and the ground with the Matlab software; it founded that the calculation data and the actual data differ only 0.31,but the corresponding ground temperature field vary widely. Thus, it can be concluded that the more precise temperature field of the ground can be simulated with the actual data of ground coefficient of thermal conductivity.

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