摘要
针对机场道面"锅盖效应"现象,建立考虑水汽相变的一维有限元模型,通过数值方法模拟道面结构阻滞和环境温度共同作用下土基中的水分运移过程,分析季节性温度变化、初始温度、初始饱和度和道面结构等因素的影响.结果表明,温度降低会引起土基表层水分"富集",主要影响深度为1m,土体初始温度和初始饱和度越高,水分"富集"越明显;季节性温度变化对砂土含水量影响很小,黏土次之,粉质黏土最大,饱和度改变量可达6%左右;道面结构的存在对土基表层含水量影响十分显著,现场检测结果与分析结果规律较一致.
A simplified one-dimensional finite model was developed to study the＂pot-cover＂phenomenon in airport runways taking water-vapor phase change into consideration.Moisture movement process in subgrade soils was numerically simulated under the influence of pavement structure＇s blocking effect and environmental temperature.The influence of seasonal temperature change,initial temperature,initial saturation and pavement＇s blocking effect were analyzed.Results showed that water content in subgrade surface enriched with the decrease of temperature.The main influence depth was 1m.The water enrichment phenomenon was enhanced with the rising of initial saturation and temperature.Seasonal temperature change affected silty clay the most,maximum saturation change of which could reach nearly 6%,the second for clay,while water content in sand is relatively less affected.The existence of pavement structure has significant influence on moisture distribution.The analysis results accorded with in-situ test results.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2016年第5期822-830,共9页
Journal of Zhejiang University：Engineering Science
基金
国家"973"重点基础研究发展计划项目(2014CB047005)
关键词
锅盖效应
道面阻滞
温度循环
粉质黏土
现场检测
pot-cover effect
blocking effect
temperature cycling
silty clay
in-situ test
