甘肃定西原状Q<sub>3</sub>黄土各向异性试验研究

徐善常; 梁庆国; 李帅帅; 张堂杰; 张荣

甘肃定西原状Q₃黄土各向异性试验研究

徐善常^{1, 2,},
梁庆国^{1, 2,},
李帅帅^{1, 2},
张堂杰^{1, 2},
张荣^{1, 2}

1.
甘肃省道路桥梁与地下工程重点实验室, 兰州 730070
2.
兰州交通大学土木工程学院, 兰州 730070

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
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- 被引次数: 0
出版历程
- 收稿日期: 2014-12-01
- 刊出日期: 2015-09-01

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

XU Shan-chang^{1, 2
,},
LIANG Qing-guo^{1, 2
,},
LI Shuai-shuai^{1, 2},
ZHANG Tang-jie^{1, 2},
ZHANG Rong^{1, 2}

1.
Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070, China
2.
College of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

摘要

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。
- 原状黄土 /
- 各向异性 /
- 破坏应力 /
- 破坏应变 /
- 变形模量
Abstract: Through the triaxial test in the laboratory, the anisotropy effect of Q₃ loess from Dingxi, Gansu on the shear strength and deformation parameters was studied. The results show that the anisotropy of undisturbed Q₃ loess has obvious influence on its mechanical properties. The shear strength in vertical direction of the loess is much higher than that in horizontal direction, and with the increase of the confining pressures, the difference between the shearing strengths of the two directions decreases significantly and eventually stabilizes within an error of 10%. When the confining pressure is lower than 100 kPa, the failure strain of the loess in horizontal direction is higher than that in vertical direction, and the difference between the failure strains of the two directions gradually decreases with the confining pressure increases. When the confining pressure is higher than 200 kPa, the failure strains in vertical and horizontal directions tend to be the same. By using Duncan-Chang model, the measured and the calculated deviatoric stresses are compared which indicate that the difference between the vertical direction and the horizontal direction is large in the low strain range, and with the confining pressure increasing, the difference gradually decreases and stabilizes in the error range of 5%. The stress strain curves of the loess samples in both the vertical and horizontal directions show linear relationship with very high regression coefficients when the strain is less than 2%, which can be used to approximately calculate the deformation modulus of the loess samples in both directions, and the corresponding values are 130 MPa and 85 MPa respectively.
- undisturbed loess /
- anisotropy /
- failure stress /
- failure strain /
- deformation modulus

HTML全文

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

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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

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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

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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

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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

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图 6 不同围压下应变与误差曲线

Figure 6. Strain and error curves under different confining pressures

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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

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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

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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
围压/kPa	a	b	R²	a	b	R²
50	0.0033	0.0027	0.9963	0.0046	0.0055	0.9992
100	0.0016	0.0033	0.9910	0.0076	0.0034	0.9996
150	0.0013	0.0033	0.9946	0.0068	0.0033	0.9988
200	0.0018	0.0027	0.9996	0.0073	0.0025	0.9983
300	0.0035	0.0018	0.9976	0.0060	0.0020	0.9985
注：a、b为关于土的试验参数；R²为相关系数

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