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干湿过程中膨胀土最大剪切模量及其预测

陈伟 孙德安 张俊然

陈伟, 孙德安, 张俊然. 干湿过程中膨胀土最大剪切模量及其预测[J]. 水文地质工程地质. doi: 10.16030/j.cnki.issn.1000-3665.202012033
引用本文: 陈伟, 孙德安, 张俊然. 干湿过程中膨胀土最大剪切模量及其预测[J]. 水文地质工程地质. doi: 10.16030/j.cnki.issn.1000-3665.202012033
CHEN Wei, SUN De’an, ZHANG Junran. The maximum shear modulus of expansive soil during wetting-drying processes and its prediction[J]. Hydrogeology & Engineering Geology. doi: 10.16030/j.cnki.issn.1000-3665.202012033
Citation: CHEN Wei, SUN De’an, ZHANG Junran. The maximum shear modulus of expansive soil during wetting-drying processes and its prediction[J]. Hydrogeology & Engineering Geology. doi: 10.16030/j.cnki.issn.1000-3665.202012033

干湿过程中膨胀土最大剪切模量及其预测

doi: 10.16030/j.cnki.issn.1000-3665.202012033
详细信息
    作者简介:

    陈伟(1995-),男,硕士研究生,研究方向为非饱和土力学。E-mail:chengwei737475078@qq.com

    通讯作者:

    孙德安(1962-),男,教授,研究方向为非饱和土力学。E-mail:sundean@shu.edu.cn

  • 中图分类号: TU443

The maximum shear modulus of expansive soil during wetting-drying processes and its prediction

  • 摘要: 为了研究膨胀土在天然环境下的动力特性,本文利用装有弯曲元的三轴仪对南阳膨胀土原状样和重塑样进行了最大剪切模量的测试试验。试验包括在不同围压下的饱和原状南阳膨胀土最大剪切模量测试;将初始干密度相近的原状样和重塑样分别进行脱湿和吸湿,量测整个过程中最大剪切模量的变化,并结合孔隙比进行分析。试验结果表明:饱和南阳膨胀土的最大剪切模量随着围压增大而增大;脱湿过程中南阳膨胀土最大剪切模量与含水率关系曲线要高于吸湿过程的曲线,即最大剪切模量与含水率关系存在滞回特性,这主要是吸力作用的缘故;初始干密度相近条件下原状样的最大剪切模量比重塑样的要小,这是由于原状样内部存在较多大孔隙。本文最后对饱和土最大剪切模量公式进行改进,使之适用于非饱和原状南阳膨胀土最大剪切模量的预测。
  • 图  1  弯曲元系统延迟

    Figure  1.  Delay of the bender element system

    图  2  南阳原状膨胀土

    Figure  2.  Undisturbed Nanyang expansive soil

    图  3  南阳膨胀土的颗粒曲线

    Figure  3.  Graded curve of the Nanyang expansive soil

    图  4  装有弯曲元的三轴仪示意图

    Figure  4.  Triaxial apparatus with bender element

    图  5  弯曲元三轴试样制样模具

    Figure  5.  Triaxial specimen mould for the bender element tests

    图  6  饱和原状和重塑膨胀土的最大剪切模量

    Figure  6.  The maximum shear moduli of the saturated undisturbed and remolded expansive soil

    图  7  干湿过程中重塑膨胀土最大剪切模量和孔隙比曲线

    Figure  7.  The maximum shear modulus and void ratio of the remolded expansive soil during drying and wetting processes

    图  8  干湿过程中原状和重塑样的最大剪切模量

    Figure  8.  The maximum shear modulus of the undisturbed and remolded specimens during drying and wetting processes

    图  9  干湿过程中非饱和原状和重塑膨胀土样的孔隙比

    Figure  9.  Void ratio of the undisturbed and remolded expansive soil specimens during drying and wetting processes

    图  10  含水率20%原状和重塑膨胀土样的孔径分布

    Figure  10.  Pore size distribution of the undisturbed and remolded expansive soil specimens in water content of 20.0%

    图  11  饱和土参数拟合

    Figure  11.  Parameter fitting of the saturated soil

    图  12  原状南阳膨胀土的实测值与预测值对比

    Figure  12.  Measured and predicted values of the undisturbed Nanyang expansive soil

    表  1  南阳膨胀土基本物理指标

    Table  1.   Basic physical indexes of the Nanyang expansive soil

    石英
    /%
    伊蒙混层
    /%
    相对密度
    Gs
    液限
    wL/%
    塑限
    wP/%
    塑性指标
    Ip
    自由膨胀率
    δf/%
    61.024.22.7447.525.322.252
    下载: 导出CSV

    表  2  干湿过程中原状南阳膨胀土参数及最大剪切模量的预测值

    Table  2.   Parameters and the predicted maximum shear modulus values of the undisturbed Nanyang expansive soil during drying and wetting processes

    状态含水率
    w/%
    孔隙比e吸力
    s/MPa
    饱和度
    Sr/%
    Gmax预测值
    /MPa
    脱湿过程19.80.6680.2181.376.2
    15.10.5774.2671.5144.0
    11.80.53211.5060.8183.0
    7.80.50336.4042.7225.0
    3.60.484109.4020.9251.0
    吸湿过程7.70.52116.6040.4185.0
    11.70.5672.0356.5121.0
    15.70.6250.1669.077.1
    19.40.6740.0278.964.1
    20.30.6890.0180.562.0
    注:吸力使用WP4C露点水势仪测量,$ {\sigma }_{\mathrm{m}}=0.1\mathrm{M}\mathrm{P}\mathrm{a} $。
    下载: 导出CSV
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  • 收稿日期:  2020-12-16
  • 修回日期:  2021-01-30
  • 网络出版日期:  2021-09-03

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