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含盐遗址重塑土的吸力测定及土水特征曲线拟合

张悦, 叶为民, 王琼, AlessandroTarantino

张悦, 叶为民, 王琼, AlessandroTarantino. 含盐遗址重塑土的吸力测定及土水特征曲线拟合[J]. 岩土工程学报, 2019, 41(9): 1661-1669. DOI: 10.11779/CJGE201909010
引用本文: 张悦, 叶为民, 王琼, AlessandroTarantino. 含盐遗址重塑土的吸力测定及土水特征曲线拟合[J]. 岩土工程学报, 2019, 41(9): 1661-1669. DOI: 10.11779/CJGE201909010
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ZHANG Yue, YE Wei-min, WANG Qiong, Aless. Suction measurement and SWRC modelling for reconstituted salt-laden soils in earthen heritages[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(9): 1661-1669. DOI: 10.11779/CJGE201909010
Citation: ZHANG Yue, YE Wei-min, WANG Qiong, Aless. Suction measurement and SWRC modelling for reconstituted salt-laden soils in earthen heritages[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(9): 1661-1669. DOI: 10.11779/CJGE201909010
shu

含盐遗址重塑土的吸力测定及土水特征曲线拟合  English Version

  • 1. 同济大学岩土及地下工程教育部重点实验室,上海 200092;
    2. 教育部城市环境与可持续发展联合研究中心,上海 200092;
    3. 斯克莱德大学土木与环境工程系,英国 格拉斯哥 G1 1XJ

基金项目: 国家自然科学基金项目（41672271,41527801）
详细信息
    作者简介:

    张 悦(1989— ),女,博士,主要从事非饱和土力学和岩土质文物保护方面的研究工作。E-mail：2012zhangy@tongji.edu.cn。

    通讯作者:

    叶为民，E-mail：ye_tju@tongji.edu.cn

Suction measurement and SWRC modelling for reconstituted salt-laden soils in earthen heritages

  • 1. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China;
    2. United Research Center for Urban Environment and Sustainable Development, the Ministry of Education, Shanghai 200092, China;
    3. Department of Civil & Environmental Engineering, University of Strathclyde, Glasgow G1 1XJ, UK;

摘要

    摘要
  • 摘要: 在水、盐等多种因素的长期共同影响下,珍贵的交河故城本体普遍形成了表层结皮剥蚀病害,引发遗址不可逆转的破坏。非饱和土的特性与其吸力大小密切相关,因此准确确定土水特征曲线是深入研究土遗址劣化机理的基本前提。针对交河遗址土配制NaCl含量不同的泥浆,采用5种吸力测定方法（盐溶液蒸气平衡法、露点水势仪、滤纸法、压力膜仪和高容量张力计）获取被测土体干燥过程中的总吸力和基质吸力,开展不同方法所得吸力值之间的差异分析,借助van Genuchten（vG）和Fredlund & Xing（FX）两种模型拟合基质吸力的土水特征曲线。结果表明,NaCl对遗址土基质吸力几乎没有影响,但由于引发渗透吸力而使总吸力在高含水率段显著增大。不同吸力测定方法反映的遗址土持水特性大体相似;综合多组试验数据可降低曲线拟合误差,在全吸力范围内获得可靠的土水特征脱湿曲线。vG模型和FX模型的拟合效果都比较好,结果为进一步定量化分析土遗址表层结皮开裂病害的形成演变过程提供了科学依据。
    Abstract: Under the long-term impacts of influencing factors including water and soluble salts, the Site of Yarkhoto Ancient City which is a precious earthen heritage is subjected to irreversible deterioration. Exfoliation of surface crusts on the remaining walls is one of the commonly observed pathologies. The behaviors of unsaturated soils are dependent on suction, thus making it crucial to obtain reliable soil-water retention curve (SWRC) for investigating the deterioration mechanisms of earthen heritages. The slurries with different NaCl contents are prepared from the local soils. The total suction and matric suction during desiccation are determined using five methods (vapor equilibrium, water potentiometer, filter paper, pressure plate and high-capacity tensiometer), and the discrepancies are further discussed. Meanwhile, two models, i.e., van Genuchten (vG) and Fredlund & Xing (FX), are adopted to model the SWRC. The results show that NaCl has insignificant effect on the matric suction but induces osmotic suction, leading to a great increase in the total suction especially at high water contents. The general trend of water retention behavior of soils obtained by various methods is consistent. Based on the data obtained by different methods, the errors of curve fitting can be minimized, and a reliable SWRC on drying path is acquired in the full suction range. Both vG and FX models can model the experimental data well, which provides a scientific basis for further quantitative analysis of the evolution process of surface crusts cracking in earthen heritages.
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  • 收稿日期:  2018-06-24
  • 发布日期:  2019-09-24

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