同济大学学报（自然科学版）2024，Vol.52Issue(4)：582-591,10.DOI:10.11908/j.issn.0253-374x.22341
冻融条件下路基温度场和湿度场分布式感知试验
Laboratory Study on Temperature Field and Moisture Field Distributed Sensing of Subgrade in Freezing and Thawing
摘要
Abstract
In this paper,a laboratory test device for multi-physical field sensing during soil freezing and thawing was established.Traditional point sensors and distributed optical fibers were used in the test to monitor the temperature field,moisture field,and deformation of the subgrade during freezing and thawing process.Distributed sensing characteristics of the temperature and moisture fields of the soil under single-ended freezing and double-ended thawing condition were investigated,and the monitoring performance of the active heating distributed optical fiber technology was verified.The results show that,under the condition of-15℃single-ended freezing,the soil freezing process is divided into three stages according to the cooling rate,i.e.,the rapid cooling stage,the gradual cooling stage,and the stable equilibrium stage.The freezing front gradually moves down during freezing,and the maximum freezing depth is about 35%of the height of soil column.The pore water is affected by the frost heave migration force to the freezing front and causes the redistribution of soil moisture field before and after freezing and thawing,thus causes frost heave deformation of the soil,which accounts for 7.8%to 10.9%of the maximum freezing depth of soil column.The distributed optical fiber can accurately obtain the characteristics of the soil temperature and moisture fields during the freezing and thawing process,and identify the range of the freezing area in the soil.The goodness of fit R2 of temperature and moisture monitoring reaches 0.98 and 0.94,respectively.关键词
路基工程/温度场/湿度场/分布式感知/季冻区路基/主动加热光纤Key words
subgrade engineering/temperature field/moisture field/distributed sensing/subgrade in seasonal frozen area/active heated fiber optics分类
交通工程引用本文复制引用
凌建明,张玉,钱劲松,吴振吉,郑纯宇..冻融条件下路基温度场和湿度场分布式感知试验[J].同济大学学报（自然科学版）,2024,52(4):582-591,10.基金项目
国家重点研发计划(2018YFB1600200) （2018YFB1600200）
吉林省交通运输科技项目(2018-1-6) （2018-1-6）
