寒区隧道浅埋段温度场解析解

发布时间：2018-03-03 03:32

本文选题：寒区隧道　切入点：浅埋　出处：《公路》2017年11期 　论文类型：期刊论文

【摘要】：依据传热学中的固体热传导理论,结合寒区隧道浅埋段传热特征,建立了考虑地表和洞内气温联合作用下的浅埋段隧道传热数学模型。为便于求解,根据空气温度周期变化的特点,运用热叠加原理把复杂温度边界条件下的隧道瞬态传热问题分解为温度周期变化下的瞬态传热问题和恒温边界作用下的稳态传热问题,综合运用分离变量法与Laplace变换法相结合,理论推导隧道浅埋段温度场的解析解,并将其与隧道温度场实测数据进行对比验证,理论解与实测值的误差为4.5%,理论解达到了工程精度要求。分析隧道埋深、洞内气温和保温层厚度对隧道温度场的影响规律,并建立了寒区隧道浅埋段保温层厚度的设计计算方法,可为工程人员提供指导。
[Abstract]:According to the theory of solid heat conduction in heat transfer and the heat transfer characteristics of shallow tunnel in cold region, a mathematical model of heat transfer in shallow buried tunnel considering the combined action of surface temperature and air temperature in tunnel is established. According to the characteristics of periodic variation of air temperature, the transient heat transfer problem of tunnel under complex temperature boundary condition is decomposed into transient heat transfer problem under temperature period change and steady heat transfer problem under constant temperature boundary action by using the principle of thermal superposition. By combining the method of separating variables with the method of Laplace transform, the analytical solution of temperature field in shallow tunnel is deduced theoretically, and compared with the measured data of tunnel temperature field. The error between the theoretical solution and the measured value is 4.5, and the theoretical solution meets the requirements of engineering precision. The influence of the tunnel depth, the temperature and the thickness of the insulation layer on the temperature field of the tunnel is analyzed. The design and calculation method of the thickness of insulation layer in shallow buried section of tunnel in cold area is established, which can provide guidance for engineers.
【作者单位】：南京水利科学研究院;重庆高速公路集团有限公司东北营运分公司;东南大学岩土工程研究所;
【基金】：国家自然科学基金项目,项目编号51308107
【分类号】：U457.2

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