路基温度场长期模拟中的地表热边界条件研究

白青波; 李旭; 田亚护

doi:10.11779/CJGE201506021

路基温度场长期模拟中的地表热边界条件研究 English Version

北京交通大学土木建筑工程学院, 北京 100044

基金项目: 国家重点基础研究发展计划（973 计划）项目（2012CB026104）；国家自然科学基金项目（51479001, 41271072）

详细信息

作者简介:
白青波(1990– ), 男, 硕士研究生, 主要从事冻土水热耦合特性和路基稳定性的研究。E-mail: ceXuLi2012@gmail.com

中图分类号: TU43
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出版历程
- 收稿日期: 2014-06-10
- 发布日期: 2015-06-18

Upper boundary conditions in long-term thermal simulation of subgrade

School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 在路基温度场模拟中, 地表热边界常基于“附面层原理”确定, 即假设一定深度（附面层厚度）的土体温度函数等于大气日平均温度函数加上一个温度增量。目前, 附面层厚度和温度增量一般通过实际观测值回归分析得到, 尚未建立起相应的理论和参数确定方法, 无法定量分析路面材质、路面结构、太阳辐射、路面辐射对附面层厚度和温度增量的影响。首先通过理论分析, 建立了附面层厚度的确定方法；然后建立了一维路面路基结构温度场模拟模型, 并通过路基温度场反演分析, 验证了数值模型的正确性；进而通过数值分析, 研究了太阳辐射、路面辐射、对流换热和路面结构等因素对附面层底部温度增量的影响, 给出了温度增量的确定方法和相应的设计图表和计算公式。
- 温度场 /
- 附面层 /
- 路基 /
- 等效热扩散率
Abstract: In the numerical simulation of a long-term temperature field in subgrade, the upper thermal boundaries are often determined by the boundary-layer theory, in which the temperature at a certain depth, i.e., the thickness of boundary layer, can be used as a temperature increment plus an average temperature of atmosphere. Because of the lack of a model, the boundary-layer thickness and the temperature increment are usually extracted from the monitored data of subgrade temperature in field. The objective of this study is to develop a model for the determination of the boundary-layer thickness and temperature increment. A theoretical derivation is carried out and leads to a solution of the thickness of boundary layer. Then a numerical model is established to simulate the temperature field in pavement and subgrade. The numerical model is verified through the back analysis of a case study. Furthermore, a sensitive study is carried out to study the impact of solar radiation, pavement materials, pavement structure and pavement radiation on the temperature increment, resulting in an empirical equation and a design chart.
- temperature field /
- boundary layer /
- subgrade /
- equivalent thermal diffusivity

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参考文献(20)

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