Evolution of Frost Penetration and Ablation in the Surrounding Rock of Cold Region Tunnels

2018 ◽  
pp. 517-527
Author(s):  
Zhitao Lv ◽  
Caichu Xia ◽  
Yu Zhou ◽  
Changling Han ◽  
Yuesong Wang
Keyword(s):  
Surrounding Rock ◽  
Cold Region ◽  
Frost Penetration

Numerical Analysis of Optimization Design for Insulation Layer in Cold Regions Tunnel

2014 ◽  
Vol 1065-1069 ◽  
pp. 368-372 ◽  
Author(s):  
He Song ◽  
Chao Liang Ye ◽  
Jun Feng Mi
Keyword(s):  
Optimization Design ◽  
Frost Damage ◽  
Surrounding Rock ◽  
Temperature Fields ◽  
Insulation Layer ◽  
Cold Region ◽  
Element Analysis ◽  
Penetration Length ◽  
Dimensional Finite Element ◽  
Frost Penetration

Setting of insulation layer is widely recognized to prevent frost damage for tunnels constructed in cold region. Optimization design of insulation layers, however, still need deeply investigate. In this paper, taking Houanshan tunnel as example, two-dimensional finite element analysis on the optimization design of insulation layers has been carried out by ABAQUS. The tunnel temperature fields due to various thickness and length of insulation layer are numerically analyzed. It shows that ,1)4.85°C increased at backside of insulation layer with thickness of 5cm, while 5.8°C increased for thickness of 7cm;2) frozen depth of surrounding rock decrease with the increase of insulation layer thickness. The farther distance to tunnel portal, the smaller thickness of insulation layer required to prevent the surrounding rock from freezing;3)According to analysis, frost penetration length should be 450~500m before tunnel holing-through ,while 720m~830m after tunnel holing-through.

Study on the Range of Freeze-Thaw of Surrounding Rock from a Cold-Region Tunnel and the Effects of Insulation Material

2011 ◽  
Vol 399-401 ◽  
pp. 2222-2225 ◽  
Author(s):  
Peng Qi ◽  
Jing Zhang ◽  
Zhi Rong Mei ◽  
Yue Xiu Wu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Surrounding Rock ◽  
Insulation Material ◽  
The Finite Element Method ◽  
Cold Region ◽  
Coupled Problem ◽  
Fluid Transfer ◽  
Tunnel Depth ◽  
The Relationship

A mathematical models for the coupled problem is established by considering heat and mass transfer and phase change for rock mass at low temperature, according to the theory of heat and mass transfer for porous media. It is considered of the influences of fluid transfer on the heat conduction and the temperature gradient on the seepage. By adopting the finite element method, the numerical simulation is done to study the range of frost-thaw of surrounding rock and the effects of insulation material in cold regions, which analysis the influence of tunnel depth and surrounding rock class on the range of frost-thaw, the change law of the frost-thaw area of different insulation material and the relationship between the frost-thaw area and the thickness of insulation material.

Analysis on Coupling of Temperature Field and Stress Field for Tunnel Surrounding Rock in Cold Region

2012 ◽  
Vol 594-597 ◽  
pp. 2578-2581
Author(s):  
Hui Mei Zhang ◽  
Yuan Liang ◽  
Chuan Gao Chen ◽  
Hai Bo Cao
Keyword(s):  
Theoretical Model ◽  
Theoretical Basis ◽  
Mutual Influence ◽  
Surrounding Rock ◽  
Stress Fields ◽  
Cold Region ◽  
Rock Body ◽  
Volume Load ◽  
Engineering Parameters ◽  
Mountain Tunnel

Based on the theory of mass and energy transfer, the coupling theoretical model of temperature and stress fields in the process of rock freeze-thaw was established considering the volume load caused by temperature change within the rock body. Taking Daban mountain tunnel surrounding rock at its exit as example, the heat--stress coupling process was numerically calculated, and the mutual influence and varied laws of temperature and stress fields were researched. The simulating result is similar to the current results and engineering experience, which can verify the correctness of the theoretical model and the reliability of calculation method, and also provide some theoretical basis for determining the engineering parameters scientifically, optimizing the lining and supporting scheme and ensuring the safety of design and construction.

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.

scholarly journals Incidents of damage to berm drainage ditches in cold region and countermeasures

2019 ◽  
Vol 265 ◽  
pp. 05019
Author(s):  
Atsuko Sato ◽  
Takahiro Yamanashi ◽  
Takayuki Adachi
Keyword(s):  
Soil Temperature ◽  
Penetration Depth ◽  
Frost Heave ◽  
Drainage Ditches ◽  
Drainage Ditch ◽  
Cold Region ◽  
Freeze Thaw ◽  
Ground Conditions ◽  
Frost Penetration

Berm drainage ditches may fail due to frost heave in cold and snowy areas like Hokkaido. Many of these failures are regarded to be caused by damage due to frost heave in the ground or freeze-thaw, but no sufficient measures are being taken, as construction guidelines and procedures do not describe any established countermeasures for the damage. Therefore, it was decided to study countermeasures by utilizing berm drainage ditches that can change form in response to frost heave, rather than by trying to reduce the level of change caused by frost heave. A drainage ditch made of flexible asphalt sheets was constructed on site, and the soil temperature, frost penetration depth, frost heave amount, and other parameters were measured. As a result, it was found that a drainage ditch made of asphalt sheets is more effective when ground conditions including moisture and temperature are severe in relation to frost heave.

Analytical Elasto-plastic Solution for Frost Force of Cold-Region Tunnels considering Anisotropic Frost Heave in the Surrounding Rock

2019 ◽  
Vol 23 (9) ◽  
pp. 3831-3842 ◽  
Author(s):  
Qiang Feng ◽  
Shenggang Fu ◽  
Chengxiang Wang ◽  
Weiwei Liu ◽  
Ying Wang ◽  
...  
Keyword(s):  
Surrounding Rock ◽  
Frost Heave ◽  
Cold Region
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