摘要
热物性参数是冻土路基温度场稳定性分析和评价最重要的一类参数,确定这类参数主要有室内试验、现场试验以及基于实测资料的反演分析等方法。文中建立冻土路基相变温度场的参数反分析模型,以青藏公路高温冻土路基为例,采用单因素分析法对路基填土、最大融化深度内地基土和多年冻土的热物性参数的敏感性进行分析与评价。结果表明:最大融化深度内的地基土的体积热容量和冻结状态的导热系数等参数敏感性最强,填土和最大融化深度内的地基土的相变潜热等为较敏感参数,而各土层融化状态的导热系数等为不敏感参数。研究结果可作为冻土路基温度场参数选取和反演的参考依据。
Thermal parameters are important for stability analysis and evaluation of permafrost roadbed temperature field. The main methods to determine these values include laboratory tests, situ tests and inverse analysis method based on observed data, et al. The parameters optimization model of permafrost roadbed phase change temperature field is established, then the sensitivity of thermal parameters of inver- sion model is analyzed and evaluated. Taking Qinghai-Tibet Highway permafrost roadbed for example, the sensitivity of volumetric heat capacity, thermal conductivity and latent heat to optimization objective function for three types of soil under permafrost roadbed surface are analyzed by using the single factor analysis. The study results are helpful and meaningful for selecting the thermal parameters to temperature field calculating.
出处
《公路》
北大核心
2012年第12期72-77,共6页
Highway
基金
中央高校基本研究费专项基金项目
项目编号LZUJBKY-2011-7
关键词
冻土路基
温度场
热物性参数
敏感性分析
permafrost roadbed
temperature field
thermal parameters
sensitivity analysis
