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为解决高海拔寒区隧道仅仅依靠保温层还不足以防止隧道洞口段产生冻害的问题,将主动加热系统作为保温层的补充保温措施应用于西藏米拉山隧道。主动加热系统由布设于二次衬砌和保温层之间的电加热带和隧道洞外的太阳能发电系统组成,可用于严寒时期隧道洞口段衬砌的防冻保温。建立考虑隧道衬砌和热源的隧道洞口段围岩传热模型,运用叠加原理得到洞口段围岩温度场解析解。运用反演法来计算洞口段围岩的热物性参数。计算结果表明:在米拉山隧道中,电加热系统的铺设范围建议为0～330 m,其中0～100 m范围的电加热系统的运行功率建议为152 W/m2,100～200 m范围内的电加热系统功率建议为131 W/m2,200～330 m范围内的电加热系统功率建议为107 W/m2,将得到的理论解与试验结果对比,其精度满足工程应用要求。研究成果可为类似高海拔寒区隧道电加热系统的设计与施工提供理论上的指导。
Abstract：In order to solve the problem that it is not enough to rely only on thermal insulating layer to prevent freezing damage at portal section of the tunnel in alpine region, an active heating system is applied to Mila Mountain Tunnel in Tibet as a supplementary insulation measure for the insulating layer therein. The active heating system consists of heating belt installed between the secondary lining and the insulating layer and a solar power generating system outside the tunnel, which can be used for the freeze-prevention and insulation of the lining for the tunnel portal section during extreme cold period; for which a tunnel lining and heat source-considered surrounding rock heat transfer model is established, and then the analytical solution of the surrounding rock temperature filed is obtained with the principle of superposition, while the thermophysical parameters of the surrounding rock at the tunnel portal section are calculated with the method of inversion. The calculation result shows that in Mila Mountain Tunnel, the placing range of the electric heating system is suggested to be 0～330 m, in which the operation power of the electric heating system for the range of 0～100 m is suggested to be 152 W/m2,the power of the electric heating system for the range of 100～200 m is suggested to be 31 W/m2 and the power of the electric heating system for the range of 200～330 m is suggested to be 107 W/m2, for which the theoretical solution is compared with the experimental result, thus the accuracy meets the requirement of the engineering application concerned. The study result can provide a theoretical guidance for the design and construction of the electric heating system for the tunnel in similar alpine region.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2019.07.013
中图分类号:U457
引用信息:
[1]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(07):99-104.DOI:10.13928/j.cnki.wrahe.2019.07.013.
基金信息:
国家自然科学基金项目(51779197);; 西藏自治区重点科研项目(2016XZ01G31)
2019-07-20
2019-07-20