长江科学院院报 ›› 2022, Vol. 39 ›› Issue (9): 118-123.DOI: 10.11988/ckyyb.20210410

• 岩土工程 • 上一篇    下一篇

非饱和黄土弹性模量与饱和度关系模型研究

郑洁1,2, 郑红卫2, 王菁莪2   

  1. 1.武汉工程科技学院 信息工程学院,武汉 430200;
    2.中国地质大学(武汉) 教育部长江三峡库区地质灾害研究中心,武汉 430074
  • 收稿日期:2021-05-27 修回日期:2021-10-19 出版日期:2022-09-01 发布日期:2022-09-21
  • 通讯作者: 王菁莪(1985-),男,湖北武汉人,助理研究员,博士,研究方向为地质灾害防治。E-mail:wangjinge@cug.edu.cn
  • 作者简介:郑 洁(1984-),女,湖北武汉人,讲师,硕士,研究方向为岩土体的工程性质。E-mail:250824225@qq.com
  • 基金资助:
    国家自然科学基金项目(41502280,41672297);中国博士后科学基金项目(2014M552117)

A Model of the Relationship between Elastic Modulus and Saturation of Unsaturated Loess

ZHENG Jie1,2, ZHENG Hong-wei2, WANG Jing-e2   

  1. 1. College of Information Engineering,Wuhan University of Engineering Science,Wuhan 430200,China;
    2. Three Gorges Research Center for Geohazards of Ministry of Education,China University of Geosciences, Wuhan 430074,China
  • Received:2021-05-27 Revised:2021-10-19 Online:2022-09-01 Published:2022-09-21

摘要: 为研究非饱和黄土弹性模量与饱和度的相关性,采用一种基于吸应力理论与粒子图像测速技术相结合的方法对典型非饱和马兰黄土重塑样品的弹性模量随饱和度变化规律进行测试与分析。该方法通过自主研制的多功能摄影测量装置获取饼状土样从饱和状态至干燥过程中的高分辨率数码图像与含水率变化数据,同时使用压力板仪与单轴压缩仪分别测试试样的土水特征曲线与泊松比。结合吸应力理论与极坐标形式应力-应变关系理论计算土样在不同饱和度状态下的弹性模量。3种干密度重塑土样在自然风干过程中的弹性模量变化测试结果表明,马兰黄土的弹性模量随饱和度降低而呈指数增大,提出了拟合弹性模量与饱和度关系的数学模型。

关键词: 非饱和黄土, 弹性模量, 饱和度, 粒子图像测速, 吸应力

Abstract: In the aim of investigating the relationship between elastic modulus and saturation of unsaturated loess,a testing method based on the suction stress theory and particle image velocimetry technique is employed to test the variation of elastic modulus with saturation of typical remolded Malan loess.The high-resolution digital images and moisture content data of flat cylindrical soil samples subjected to dessication from saturation to dry condition are obtained by this method using a self-made multi-function photogrammetric device.Meanwhile,the soil-water characteristic curve and Poisson’s ratio of the samples are measured by pressure plate instrument and uniaxial compression instrument,respectively.Furthermore,the elastic modulus of unsaturated soil with different water content are calculated based on the suction stress theory and the stress-strain relations in polar coordinates.The test data of samples with different dry densities during air drying process indicates that the elastic modulus of Malan loess samples increase exponentially with the decrease of saturation.A mathematical model for the relationship between the elastic modulus and saturation degree is proposed.

Key words: unsaturated loess, elastic modulus, saturation, particle image velocimetry, suction stress

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