基于附面层理论的路基热边界模型  

A prediction model on thermal boundary condition of embankment based on boundary layer theory

作　　者：罗晓晓 俞祁浩 马勤国 张建明 LUO Xiaoxiao;YU Qihao;MA Qinguo;ZHANG Jianming(State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000 [2]中国科学院大学工程科学学院,北京100049 [3]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641

出　　处：《中南大学学报（自然科学版）》2019年第3期658-668,共11页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2014BAG05B03);国家自然科学基金资助项目(41401088)~~

摘　　要：基于"附面层原理",建立考虑气象条件和路面结构热物理因素影响下的路面结构热交换计算模型。选用合适的判据给出热边界厚度的确定方法,然后,通过数值模拟和灰关联分析,考察太阳辐射强度、风速、路面结构等因素对热边界底部温度增量的影响。最后,对各影响因素及其交互作用下的热边界底部温度增量进行二次正交回归分析,建立热边界底部温度计算模型,并以青藏高原气象数据和青藏高速公路路基试验段实测的温度验证模型的可靠性。研究结果表明:热边界厚度与路基等效热扩散率线性正相关;路面吸收率对热边界底部温度增量的影响最大,太阳辐射强度的影响次之,对流换热系数的影响中等,等效热扩散率的影响较小,发射率的影响最小;该模型可靠性高,可以用来预测路基热边界。Based on the boundary-layer theory,a model for heat exchange of embankment structure was established firstly considering all influence factors including meteorological conditions and thermal physical parameters of pavement structure to determine thermal boundary condition.And then the method to determine the thermal boundary condition was proposed.Secondly,sensitivity analysis of the influencing factors which affect the temperature increment at the thermal boundary was implemented using the method of grey relation.Finally,considering the influences of all factors and their interaction,the quadratic regression orthogonality analysis method was used to study the temperature increment at the thermal boundary.A prediction model on thermal boundary condition was established and verified by the measured temperature of Qinghai-Tibet Highway.The results show that the thickness of thermal boundary has a positive relationship with the equivalence thermal diffusivity of embankment.The road surface absorptivity has the largest influence on the thermal boundary,followed by the solar radiation,with the convective heat transfer coefficient in the middle,the equivalent thermal diffusivity being the next factor,and the road surface emissivity influences the smallest.The model is reliable and can be used to predict the thermal boundary of embankment.

关 键 词：附面层 热边界 敏感性分析 正交分析法 预测模型 

分 类 号：U416.1[交通运输工程—道路与铁道工程]