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甘肃定西原状Q3黄土各向异性试验研究

徐善常 梁庆国 李帅帅 张堂杰 张荣

徐善常, 梁庆国, 李帅帅, 等, 2015. 甘肃定西原状Q3黄土各向异性试验研究. 地质力学学报, 21 (3): 378-385.
引用本文: 徐善常, 梁庆国, 李帅帅, 等, 2015. 甘肃定西原状Q3黄土各向异性试验研究. 地质力学学报, 21 (3): 378-385.
XU Shan-chang, LIANG Qing-guo, LI Shuai-shuai, et al., 2015. EXPERIMENTAL STUDY ON ANISOTROPIC CHARACTERISTICS OF UNDISTURBED Q3 LOESS FROM DINGXI, GANSU. Journal of Geomechanics, 21 (3): 378-385.
Citation: XU Shan-chang, LIANG Qing-guo, LI Shuai-shuai, et al., 2015. EXPERIMENTAL STUDY ON ANISOTROPIC CHARACTERISTICS OF UNDISTURBED Q3 LOESS FROM DINGXI, GANSU. Journal of Geomechanics, 21 (3): 378-385.

甘肃定西原状Q3黄土各向异性试验研究

基金项目: 

国家自然科学基金项目 41262010

长江学者和创新团队发展计划项目 IRT1139

兰州交通大学“青蓝”人才工程项目 QL-08-19A

甘肃省基础研究创新群体资助项目 145RJIA332

详细信息
    作者简介:

    徐善常(1990-), 男, 兰州交通大学硕士研究生, 主要从事黄土隧道工程研究。E-mail:1208939465@qq.com

    通讯作者:

    梁庆国, 兰州交通大学土木工程学院教授, 主要从事岩土及地下工程研究

  • 中图分类号: TU431;TU432

EXPERIMENTAL STUDY ON ANISOTROPIC CHARACTERISTICS OF UNDISTURBED Q3 LOESS FROM DINGXI, GANSU

  • 摘要: 通过室内三轴试验, 研究了甘肃定西原状Q3黄土的各向异性对于黄土抗剪强度和变形参数的影响。研究结果表明, 此种黄土的各向异性对土体力学性质的影响显著。垂直向原状黄土抗剪强度明显高于水平向, 随着围压的增大, 二者之差明显下降, 最终稳定在10%的差值范围内。围压小于100 kPa时, 水平向破坏应变明显大于垂直向, 且随着围压逐渐增大二者差值逐渐减小, 并在围压高于200 kPa时, 破坏应变达到一致。利用邓肯-张模型对偏差应力实测值与计算值进行差值分析表明, 低应变处垂直向与水平向的差值均较大; 随着围压增大, 差值逐渐减小并最终稳定在±5%差值范围内, 且最大偏差应力均符合误差为±5%的范围。无论是垂直样还是水平样, 大约在2%应变之前的应力应变曲线都近似为回归系数很高的线性关系, 可近似估算不同方向黄土的变形模量, 其值分别为130 MPa和85 MPa。

     

  • 图  1  垂直向与水平向三轴应力-应变曲线

    Figure  1.  Triaxial stress-train curves in vertical and horizontal directions

    图  2  垂直向与水平向在不同围压下的破坏应力及差值

    Figure  2.  Failure stress and difference values of the loess in vertical and horizontal directions under different confining pressures

    图  3  垂直向与水平向应力归一化对比

    Figure  3.  Comparison between the normalized stress in vertical and horizontal directions

    图  4  不同围压下垂直向与水平向破坏应变及其差值

    Figure  4.  Failure strain and difference values of loess in vertical and horizontal directions under different confining pressures

    图  5  不同围压下垂直向与水平向抗剪强度及拟合程度

    Figure  5.  Failure strain and difference values of loess in vertical and horizontal directions under different confining pressures

    图  6  不同围压下应变与误差曲线

    Figure  6.  Strain and error curves under different confining pressures

    图  7  不同围压下破坏应变对应的误差

    Figure  7.  Corresponding error of failure strain under different confining pressures

    图  8  2%应变之前各围压下应力应变的线性回归

    Figure  8.  Linear regression of stress and strain with strain less than 2% under different confining pressures

    表  1  垂直向与水平向在不同围压下应力-应变曲线的拟合常数及相关系数

    Table  1.   Stress and strain curve fitting constants and correlation coefficient in vertical and horizontal directions under different confining pressures

    围压/kPa垂直水平
    abR2abR2
    500.00330.00270.99630.00460.00550.9992
    1000.00160.00330.99100.00760.00340.9996
    1500.00130.00330.99460.00680.00330.9988
    2000.00180.00270.99960.00730.00250.9983
    3000.00350.00180.99760.00600.00200.9985
        注:a、b为关于土的试验参数;R2为相关系数
    下载: 导出CSV
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  • 收稿日期:  2014-12-01
  • 刊出日期:  2015-09-28

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