Experimental Study on Electric Heating of Tunnel Lining in Cold Region

doi:10.12068/j.issn.1005-3026.2021.07.017

Abstract

Abstract: In winter， frost damage of tunnel such as lining damaged or even dripping and freezing often occurs in cold region. Therefore， the active heating system is necessary except for the insulation layer. The active heating system is mainly composed of the electric heating belt between the secondary lining and the insulation layer. In order to simulate the heating process of freezing-dripping-water tunnel lining， electric heating model tests on concrete specimen， including single specimen and triple test piece， was conducted from a negative temperature to a positive temperature. The results show that the surface temperature of the concrete specimen can be increased from -4℃ to over 0℃ within 60 minutes， if the electric heating belt with a length of 2 m， power of 30W， embedded depth of 10 mm and the polyurethane board with a thickness of 40mm are used as insulation layer. The research results can provide guidance for ice melting and antifreeze of tunnels in cold regions.

Key words: cold region tunnel; lining structure; electric heating system; temperature rising rule; experimental study

CLC Number:

U457

WANG Lian-guang， XU Xiao， LI Xue. Experimental Study on Electric Heating of Tunnel Lining in Cold Region[J]. Journal of Northeastern University(Natural Science), 2021, 42(7): 1025-1031.

References

[1]Wu Y M，Xu P，Li W B，et al.Distribution rules and key features for the lining surface temperature of road tunnels in cold regions［J/OL］.Cold Regions Science and Technology，2020，172(2019-12-30)［2020-05-28］.https://doi.org/10.1016/j.coldregions.2019.102979.
[2]Liu W W，Feng Q，Fu S G，et al.Elasto-plastic solution for cold-regional tunnels considering the compound effect of non-uniform frost heave，supporting strength and supporting time［J］.Tunnelling and Underground Space Technology，2018，82:293-302.
[3]Zhang J W，Zhang Y C，Li L，et al.A closed-form solution for the analysis of antifreeze disease fortification length in a permafrost tunnel［J/OL］.Advances in Civil Engineering，2020，2020(2020-02-18)［2020-06-02］.https://doi.org/10.1155/2020/7367954.
[4]罗彦斌，陈建勋，王梦恕，等.基于事件树理论的既有隧道冻害等级划分体系［J］.长安大学学报(自然科学版)，2011，31(6):60-65.(Luo Yan-bin，Chen Jian-xun，Wang Meng-shu，et al.Grade division system of existing tunnel’s freeze injury based on event tree theory［J］.Journal of Chang’an University(Natural Science Edition)，2011，31(6):60-65.)
[5]Luo Y B，Chen J X.Research status and progress of tunnel frost damage［J］.Journal of Traffic and Transportation Engineering(English Edition)，2019，6(3):297-309.
[6]Zhao P Y，Chen J X，Luo Y B，et al.Investigation of the insulation effect of thermal insulation layer in the seasonally frozen region tunnel:a case study in the zuomutai tunnel，China［J/OL］.Advances in Civil Engineering，2019，2019(2019-09-30)［2020-06-02］.https://doi.org/10.1155/2019/4978359.
[7]Li Y Y，Sun Y M，Qiu J L，et al.Moisture absorption characteristics and thermal insulation performance of thermal insulation materials for cold region tunnels［J/OL］.Construction and Building Materials，2020，237(2019-12-11)［2020-04-15］.https://doi.org/10.1016/j.conbuildmat.2019.117765.
[8]杨天娇，王述红，张泽，等.寒区隧道围岩水热力耦合数值分析［J］.东北大学学报(自然科学版)，2019，40(8):1178-1184.(Yang Tian-jiao，Wang Shu-hong，Zhang Ze，et al.Numerical analysis on thermo-hydro-mechanical coupling of surrounding rocks in cold region tunnels［J］.Journal of Northeastern University(Natural Science)，2019，40(8):1178-1184.)
[9]Zhang J，Liu N.Analysis of temperature field of tunnel surrounding rocks in freezing-thawing environment［J］.IOP Conference Series:Materials Science and Engineering，2019，473(1):012017.
[10]Ma Q G，Luo X X，Lai Y M，et al.Numerical investigation on thermal insulation layer of a tunnel in seasonally frozen regions［J］.Applied Thermal Engineering，2018，138:280-291.
[11]Liu H Y，Yuan X P，Xie T C.A damage model for frost heaving pressure in circular rock tunnel under freezing-thawing cycles［J］.Tunnelling and Underground Space Technology，2019，83:401-408.
[12]Feng Q，Liu W W，Jiang B S.Analytical solution for the stress and deformation of rock surrounding a cold-regional tunnel under unequal compression［J］.Cold Regions Science and Technology，2017，139:1-10.
[13]Agrawal K K，Misra R，Agrawal G D，et al.Effect of different design aspects of pipe for earth air tunnel heat exchanger system:a state of art［J］.International Journal of Green Energy，2019，16(8):598-614.
[14]夏才初，范东方，李强，等.寒区隧道保温层铺设长度的计算方法［J］.同济大学学报(自然科学版)，2016，44(9):1363-1370.(Xia Cai-chu，Fan Dong-fang，Li Qiang，et al.An approach for determining length of insulation layer in cold region tunnels［J］.Journal of Tongji University(Natural Science)，2016，44(9):1363-1370.)
[15]Lai J X，Qiu J L，Fan H B，et al.Freeze-proof method and test verification of a cold region tunnel employing electric heat tracing［J］.Tunnelling and Underground Space Technology，2016，60:56-65.
[16]邱军领，赖金星，张广龙，等.季节性寒区隧道主动加热保温防冻方法及其试验［J］.地下空间与工程学报，2017，13(4):982-987.(Qiu Jun-ling，Lai Jin-xing，Zhang Guang-long，et al.A case study on antifreeze of tunnel in seasonal cold-region using the electric heat tracing［J］.Chinese Journal of Underground Space and Engineering，2017，13(4):982-987.)
[17]杨文东，夏杰，谢全敏.高海拔寒区隧道主动保温系统加热功率的计算分析［J］.水利水电技术，2019，50(7):99-104.(Yang Wen-dong，Xia Jie，Xie Quan-min.Calculation and analysis of heating power of active heat preservation system for tunnel in alpine region［J］.Water Resources and Hydropower Engineering，2019，50(7):99-104.)