岩土力学 ›› 2021, Vol. 42 ›› Issue (9): 2489-2498.doi: 10.16285/j.rsm.2021.0137

• 基础理论与实验研究 • 上一篇    下一篇

变湿度条件下生土材料持水特性及气 态水迁移效应试验研究

徐龙飞1, 2，翁效林1，张爱军3，赵高文1，WONG Henry 2，FABBRI Antonin2   

  1. 1. 长安大学 公路学院，陕西 西安 710064；2. 里昂大学 国立国家公共工程学院，里昂 法国 69000； 3. 西北农林科技大学 水利与建筑工程学院，陕西 杨陵 712100
  • 收稿日期:2021-01-25 修回日期:2021-04-26 出版日期:2021-09-10 发布日期:2021-08-30
  • 通讯作者: 翁效林，男，1980年生，博士，教授，主要从事公路隧道与路基工程方面研究。E-mail: wengxl2000@126.com E-mail:longfei.xu@chd.edu.cn
  • 作者简介:徐龙飞，男，1989年生，博士，讲师，主要从事生土材料性质评价及本构模型方面研究。
  • 基金资助:
    中国博士后科学基金面上项目（No.2020M673320）；陕西省自然科学基金项目（No.2020JQ-369，No.2021JQ-270）；长安大学中央高校基本科研业务费专项资金资助（No.300102210308）

Experimental study of water retention characteristics and vapor migration of earth material under relative humidity variation

XU Long-fei1, 2, WENG Xiao-lin1, ZHANG Ai-jun3, ZHAO Gao-wen1, WONG Henry2, FABBRI Antonin2   

  1. 1. School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China; 2. National School of State Public Works, Lyon University, Lyon, France; 3. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
  • Received:2021-01-25 Revised:2021-04-26 Online:2021-09-10 Published:2021-08-30
  • Supported by:
    This work was supported by the General Program of China Postdoctoral Science Foundation(2020M673320), the Natural Science Foundation of Shaanxi Province (2020JQ-369, 2021JQ-270) and the Fundamental Research Funds for the Central Universities, Chang’an University(300102210308).

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摘要： 湿度变化诱发气态水迁移，进而对生土的变形和强度产生重要影响。研究变湿度条件下生土材料持水特性及气态水迁移效应是揭示服役期生土结构病害孕育机制的关键。针对法国里昂地区两种生土建筑材料，采用两种试验方法，即饱和盐溶液法和动态水蒸气吸附法开展等温吸湿试验，分析生土持水特性；通过气态水迁移效应试验，探究生土试样底部进气端和顶部出气端的湿度及水气相对压力变化规律，并对气态水迁移过程中生土试样变形进行分析。试验结果表明：两种方法测得生土吸湿曲线较为一致，可分为单层吸附阶段、多层吸附阶段和毛细凝聚阶段，并且土体持水能力随黏土颗粒活性增加而增强；在气态水迁移效应试验中，生土材料持水特性对出气端湿度与进气端水气相对压力影响明显，生土试样发生膨胀变形。

关键词: 生土, 持水特性, 气态水迁移, 等温吸湿试验, 膨胀变形

Abstract: The variation of relative humidity induces the migration of vapor, which has an important effect on the strength and deformation of earth. The sorption-desorption and migration of vapor inside the earth are of great significance for revealing the disease breeding mechanism of earth structure. Aiming at two different earth materials named STR and CRA chosen from a few existing construction sites located in Lyon region in the southeast of France, the sorption-desorption tests were conducted through two different methods, saturated salt solution method and dynamic vapor sorption (DVS) separately, and the experimental results were compared accordingly. In addition, an innovative apparatus with high-precision strain measuring system was invented and used for monitoring the vapor migration, the variation of relative humidity and gas pressure with time at the top and the bottom of earth specimens was explored, and the deformation characteristics of earth specimens during vapor migration were also analyzed. The experimental results indicate that the sorption curve obtained through DVS is in accordance with that from saturated salt solution method. The sorption curve can be divided into three parts: monolayer adsorption, multilayer adsorption and capillary condensation. Meanwhile, the retention characteristics of earth increases with the rise of clay activity. The retention characteristics have important effect on the relative humidity at the outlet and relative gas pressure at the bottom of specimens. The dilatancy phenomenon occurs during the vapor migration process.

Key words: earth material, water retention characteristic, vapor migration, sorption-desorption test, dilatancy deformation

中图分类号: TU502
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