循环荷载下重塑黄土变形特性

翁效林; 李豪; 尚许雯; 贾阳; 周尚琪; 胡继波

doi:10.19818/j.cnki.1671-1637.2019.03.002

循环荷载下重塑黄土变形特性

doi: 10.19818/j.cnki.1671-1637.2019.03.002

长安大学特殊地区公路工程教育部重点实验室, 陕西西安 710064

基金项目:

国家自然科学基金项目 51378004

陕西省自然科学基础研究计划项目 2019JM-216

中央高校基本科研业务费专项资金项目 300102218411

详细信息

作者简介:
翁效林(1980-), 男, 河南信阳人, 长安大学副教授, 工学博士, 从事特殊土性状与地下工程研究

中图分类号: U416
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出版历程
- 收稿日期: 2018-12-02
- 刊出日期: 2019-06-25

Deformation properties of remolded loess under cyclic loading

Key Laboratory of Special Region Highway Projects of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China

More Information

Author Bio:
WENG Xiao-lin(1980-), male, associate professor, PhD, 49768532@qq.com

摘要

摘要: 为研究主应力方向和大小耦合变化对土体应力-应变状态及非共轴性的影响, 采用空心圆柱扭剪仪对饱和重塑黄土开展一系列循环扭剪试验, 分析了应力-应变状态和非共轴角的变化规律及影响因素。试验结果表明: 轴向应变始终处于压缩状态, 环向应变先负向累积再正向累积, 径向应变基本处于受拉状态, 剪切应变的受拉与受压状态交替出现, 轴向、环向和剪切应变曲线的波动特性明显, 而径向应变曲线的波动特性弱, 说明循环荷载作用下各应变分量表现出不同的发展规律; 轴向和径向应变及环向和剪切应变变化幅值随中主应力系数的增大先增大后减小, 说明中主应力系数影响各应变分量的累积; 随着主应力方向角旋转范围的增大, 轴向和径向应变逐渐减小, 环向应变由负向往正向变化的趋势提前, 剪切应变变化幅值逐渐减小, 说明主应力方向角旋转范围影响各应变分量的发展趋势; 剪切和正偏应力-应变曲线滞回现象明显, 且刚度发生循环强化, 但剪切刚度的循环强化比正偏刚度更明显, 说明土体出现次生各向异性, 这是引起非共轴现象的内在因素; 非共轴角变化曲线随中主应力系数的增大先下移后上移, 随循环次数的增大而逐渐上移, 随偏应力幅值的增大其变化范围增大。可见, 循环荷载下中主应力系数、循环次数和偏应力幅值可显著影响饱和重塑黄土的应力-应变状态及非共轴性, 在黄土工程设计和本构关系研究中应加以考虑。
- 路基工程 /
- 重塑黄土 /
- 循环荷载 /
- 主应力轴旋转 /
- 应力 /
- 应变 /
- 非共轴性 /
- 空心圆柱扭剪仪
Abstract: To study the effect of coupling changes in principal stress direction and magnitude on the stress-strain state and non-coaxiality of soil, a series of cyclic torsional shear tests were carried out on the saturated remolded loess by using a hollow cylindrical torsional shear apparatus, and the variation rules and influencing factors of stress-strain state and non-coaxial angle were analyzed. Experimental result shows that the axial strain is always in a compression state, the hoop strain accumulates negatively first and then positively, the radial strain is basically in a tension state, the tension and compression states of shear strain alternate, the fluctuation characteristics of axial, hoop and shear strain curves are obvious, while the fluctuation characteristic of radial strain curve is weak, indicating that each strain component shows different development laws under the cyclic loading. The axial and radial strains and the variation amplitudes of hoop and shear strains increase first and then decrease as the intermediate principal stress coefficient increases, indicating that the intermediate principal stress coefficient affects the cumulation of each strain component. With the increase of rotation range of principal stress direction angle, the axial and radial strains decrease gradually, the trend of hoop strain changing from negative to positive advances, and the variation amplitude of shear strain decreases gradually, indicating that the rotation range of principal stress direction angle affects the development trend of each strain component. The hysteresis phenomena of shear and normal differential stress-strain curves are obvious, and the stiffness consolidates cyclically, but the cyclic strengthening of shear stiffness is more obvious than that of normal differential stiffness, indicating that the secondary anisotropy occurs in the soil. This is an intrinsic cause of the non-coaxial phenomenon. The non-coaxial angle curve moves down first and then moves up as the intermediate principal stress coefficient increases, and moves up gradually as the cycle number increases. The variation range of non-coaxial angle curve increases as the deviating stress amplitude increases. Thus, the intermediate principal stress coefficient, cycle number and deviating stress amplitude can obviously affect the stress-strain state and non-coaxiality of saturated remolded loess, which should be considered in loess engineering design and constitutive relationship research.
- subgrade engineering /
- remolded loess /
- cyclic loading /
- principal stress axis rotation /
- stress /
- strain /
- non-coaxiality /
- hollow cylindrical torsional shear apparatus

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图 1 空心圆柱扭剪仪

Figure 1. Hollow cylindrical torsional shear apparatus

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图 2 压力控制器

Figure 2. Pressure controller

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图 3 b不同时轴向应变曲线

Figure 3. Axial strain curves with different b

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图 4 α旋转范围不同时轴向应变曲线

Figure 4. Axial strain curves with different rotation ranges of α

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图 5 b不同时环向应变曲线

Figure 5. Hoop strain curves with different b

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图 6 α旋转范围不同时环向应变曲线

Figure 6. Hoop strain curves with different rotation ranges of α

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图 7 b不同时径向应变曲线

Figure 7. Radial strain curves with different b

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图 8 α旋转范围不同时径向应变曲线

Figure 8. Radial strain curves with different rotation ranges of α

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图 9 b不同时剪切应变曲线

Figure 9. Shear strain curves with different b

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图 10 α旋转范围不同时剪切应变曲线

Figure 10. Shear strain curves with different rotation ranges of α

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图 11 b=0时剪切应力-应变关系曲线

Figure 11. Relationship curve of shear stress and strain when b=0

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图 12 b=0时正偏应力-应变关系曲线

Figure 12. Relationship curve of normal differential stress and strain when b=0

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图 13 刚度变化

Figure 13. Variations of stiffnesses

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图 14 应力路径和应变增量

Figure 14. Stress path and strain increment

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图 15 N=1时不同b条件下非共轴角变化曲线

Figure 15. Non-coaxial angle change curves when N=1 under different conditions of b

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图 16 N=8时不同b条件下非共轴角变化曲线

Figure 16. Non-coaxial angle change curves when N=8 under different conditions of b

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图 17 N=1时不同q条件下非共轴角变化曲线

Figure 17. Non-coaxial angle change curves when N=1 under different conditions of q

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图 18 N=8时不同q条件下非共轴角变化曲线

Figure 18. Non-coaxial angle change curves when N=8 under different conditions of q

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表 1 试验方案

Table 1. Test programme

试样编号	p₃/kPa	b	q/kPa	α/ (°)
A	250	1.0	20	-45~45
B	250	1.0	20	-60~60
C1	250	0.0	20	-75~75
C2	250	0.5	20	-75~75
C3	250	1.0	20	-75~75
C4	250	0.0	10	-75~75
C5	250	0.0	30	-75~75

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