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冰川冻土 ›› 2021, Vol. 43 ›› Issue (1): 322-330.doi: 10.7522/j.issn.1000-0240.2019.1010

• 冰冻圈技术 • 上一篇    

基于荧光素和图像追踪技术的冻融循环作用下土体水汽迁移量测装置系统研究

程博远1,2(), 张玉芝3,4(), 王天亮1,5, 温安3, 尹赵爱1,5   

  1. 1.石家庄铁道大学 土木工程学院,河北 石家庄 050043
    2.珠海市规划设计研究院,广东 珠海 519000
    3.石家庄铁道大学 河北省大型 结构健康诊断与控制重点实验室,河北 石家庄 050043
    4.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
    5.石家庄铁道大学 道路与铁道工程安全保障省部共建教育部重点实验室,河北 石家庄 050043
  • 收稿日期:2019-01-22 修回日期:2019-05-31 出版日期:2021-02-28 发布日期:2021-04-06
  • 通讯作者: 张玉芝 E-mail:18330163225@163.com;zhangyuzhi@stdu.edu.cn
  • 作者简介:程博远,硕士研究生,主要从事冻土力学与寒区工程研究. E-mail:18330163225@163.com
  • 基金资助:
    国家自然科学基金项目(51708369);河北省自然科学基金项目(E2017210110);冻土工程国家重点实验室开放基金项目(SKLFSE201711);中国博士后科学基金项目(2018M633607)

Research on soil water-vapor migration measurement system under freeze-thaw cycles based on fluorescein and image tracking technology

Boyuan CHENG1,2(), Yuzhi ZHANG3,4(), Tianliang WANG1,5, An WEN3, Zhao’ai YIN1,5   

  1. 1.School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
    2.Zhuhai Institute of Urban Planning & Design,Zhuhai 519000,Guangdong,China
    3.Key Laboratory of Structural Health Monitoring and Control,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
    4.State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    5.Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China
  • Received:2019-01-22 Revised:2019-05-31 Online:2021-02-28 Published:2021-04-06
  • Contact: Yuzhi ZHANG E-mail:18330163225@163.com;zhangyuzhi@stdu.edu.cn

摘要:

寒区高铁路基中粗颗粒填料水汽迁移可能是路基冻胀变形的来源,直观追踪冻融循环作用下土体水汽迁移过程,有助于研究水分迁移规律,为冻胀机理提供理论依据。基于此,提出采用荧光素示踪和图像处理技术方法,直观观测土体中水汽迁移的规律。首先开展荧光素示踪、蒸发试验及图像处理技术的研究,证明示踪剂可实现冻结锋面及外界液态水迁移的追踪;而后通过改进试样筒,加入液态水隔离装置等实现可视化装置系统的研发;最后通过开放和封闭条件下水汽混合迁移和气态水迁移试验,实现了水汽迁移过程的可视化追踪。验证性试验结果表明:在开放条件下,该试验装置能够有效追踪外界水迁移的时程变化;在封闭条件下,该装置能够实时监测冻结锋面的变化过程。在粗粒土中,气态水迁移是存在的,且水分重分布主要由气态水迁移引起。

关键词: 水汽迁移, 气态水迁移, 荧光素示踪, 图像处理, 冻融循环

Abstract:

It is well known that there is the migration of water-vapor in high speed railways mainly causing frost heaving. Visually tracking the process of water-vapor migration in soil under the freeze-thaw cycles is beneficial to study water migration, and it will provide a theoretical basis for studying the mechanisms of soil frost heave. Because of the difference of the structure between coarse-grained soil and fine-grained soil, the traditional theory used to explain the mechanisms of water migration in fine-grained soils is not applicable to coarse-grained soils. The water-vapor migration is highly probably playing an important role in coarse-grained soil, which is different with the fine-grained soil. However, at present, the research on water migration under the action of freeze-thaw cycles mostly involves liquid water migration and fine-grained soil. The researches of the water-vapor migration in coarse-grained soil under freeze-thaw cycles are relatively few. One of the main reasons is the lacking of device which is visible and can track the migration of water-vapor. In this paper, aiming at the visual tracking requirements of water-vapor migration of coarse-grained soil under freeze-thaw action, a test method based on fluorescein tracing and image processing technology is proposed to establish a soil water-vapor migration measuring device system. The modified double-layer hollow plexiglass cylinder was used as a container to isolate the external environmental temperature. A liquid water isolation device, an image acquisition system, etc. were added. The feasibility of the proposed method and device system was verified by the experiment of water-vapor migration and only vapor migration under open and closed conditions. The results show that using the developed device and under the open condition, the process of external water migration can be effectively tracked; and under closed condition, the change process of the freezing front can be monitored in real time. In coarse-grained soil, vapor migration is existing, moreover, the redistribution of water in coarse-grained soil is mainly caused by the vapor migration.

Key words: water-vapor migration, vapor migration, fluorescein tracing, image processing, freeze-thaw cycles

中图分类号: 

  • TU411