多年冻土区工程路面附面层形成的物理机制

项目名称： 多年冻土区工程路面附面层形成的物理机制

项目编号： No.41301071

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 张中琼

作者单位： 中国科学院寒区旱区环境与工程研究所

项目金额： 29万元

中文摘要： 大气与冻土之间存在一个温湿度变化的不连续层-附面层，层内的物理过程影响路基热稳定性分析和冻土的准确预报。不同的路面性质使得层内的物理过程差异较大。因此，选择多年冻土区常用的工程路面形式（沥青路面和砂砾路面）开展附面层的物理特征的现场原位测试，获得气象、辐射、水热场等方面的连续监测数据。在此基础上，通过边界层理论和地温变化幅值确定附面层厚度的定量判定标准，确定工程路面附面层的厚度。统计表面温度位移和地温相对于路面温度的滞后时间，结合简谐波理论建立地气温度之间关系。分析温度变化引起的层结的变化特征，采用空气动力学计算工程路面的辐射和能量平衡特征，说明两种工程路面的储热性质差异。分析工程路面吸热后浅层地温的变化以及由水分迁移和水汽运移引起的水分累积过程，讨论附面层的水热变化过程。最后，阐述两种工程路面附面层形成的物理机制及其差异。

中文关键词： 原位测试；物理性质；辐射和能量平衡；水热不连续；物理机制

英文摘要： A discontinuous layer about changes of temperature and humidity is present between the atmosphere and permafrost, and it is termed the boundary layer. Physical processes in this layer affect the analysis of the thermal stability of embankment and accurate prediction of permafrost. The physical processes within the layer are different for different engineering pavements, and the difference is relatively large. Therefore, the common form of engineering pavement in permafrost regions (asphalt and gravel pavement) is chosen to carry out the in situ measurement of the boundary layer's physical characteristics. The continuous monitoring data in terms of meteorology, radiation, hydro-thermal field will be obtained. On this basis, the quantitative criteria of the boundary layer's thickness will be determined by the boundary layer theory and the magnitude of ground temperature changes. Later, the engineering road boundary layer's thickness will also be calculated; surface temperature offset and the time of the ground temperature lagging behind the pavement temperature will be counted. The relationship between the ground and air temperature will be established by simple harmonic theory. Variation of atmospheric stratification caused by temperature changes will be analyzed. Radiation and energy balance characteristics of e

英文关键词： in-situ testing；physical properties；radiation and energy balance；hydrothermal discontinuity；physical mechanism