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寒区隧道含相变围岩传热渗流耦合数值分析 预览

Coupling Numerical Analysis of Heat Transfer and Seepage Flow of Surrounding Rocks with Phase Transition in Cold Region Tunnels
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摘要 为研究寒区隧道围岩在冻融循环过程中的水-冰相变现象和渗流速率对围岩温度场分布的影响,基于COMSOLMultiphysics多物理场分析软件,建立含相变的围岩温度场与渗流场耦合模型,通过改变模型中的渗流速率、已冻区和正冻区的边界温度Tm,对寒区隧道的围岩温度场进行数值分析。数值分析结果表明:边界温度Tm影响正冻区的范围和不同深度处围岩水-冰相变发生的时刻,但不同的边界温度Tm对围岩温度场的影响较小;当渗流速率高于1×10-6m/s时,渗流速率的改变对围岩温度场具有明显影响,但当渗流速率低于1×10-6m/s时,渗流速率的改变对围岩温度场无明显影响。因此,在地下水渗流速率较高的地区,应同时考虑水-冰相变现场和渗流速率对寒区隧道围岩温度场的影响。 The influence of water-ice phase transition and seepage velocity on the surrounding rock temperature field distribution during the freezing-thawing process of surrounding rock in cold region tunnel is very important. Hence, based on the multi-physics coupling analysis software COMSOL Multiphysics, a coupled model of temperature field with water-ice phase transition and seepage field of surrounding rock is established;and the temperature field distribution of surrounding rock in cold region tunnels is analyzed by changing the seepage velocity and the boundary temperature Tm in the freezing and frozen zones. The numerical analysis results show that:(1) The boundary temperature Tm affects the frozen zone range and the time when water-ice phase changes at different depths in the surrounding rock, but the different boundary temperature Tm has little influence on the surrounding rock temperature field distribution.(2) The change of seepage velocity has a significant influence on the surrounding rock temperature field distribution when the seepage velocity is higher than 1×10-6m/s, while the change of seepage velocity affects the surrounding rock temperature field distribution little when the seepage velocity is lower than 1×10-6m/s. Therefore, the influences of seepage velocity and the water-ice phase transition on the surrounding rock temperature field of cold tunnels should be considered in areas with high groundwater seepage velocity.
作者 那通兴 张国柱 陈俊栋 NA Tongxing;ZHANG Guozhu;CHEN Jundong(China Railway Academy Co., Ltd., Chengdu 611731, Sichuan, China;Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, Jiangsu, China)
出处 《隧道建设(中英文)》 北大核心 2018年第A02期144-150,共7页 Tunnel Construction
关键词 寒区隧道 水冰相变 渗流速率 温度场 数值分析 cold region tunnels water-ice phase transition seepage velocity temperature field numerical analysis
作者简介 那通兴(1990—),男,四川德阳人, 2016 年毕业于同济大学,土木工程专业,硕士,工程师,现主要从事隧道与地下工程方面的研究及信息化工作。E-mail:natongxing@126.com。
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