| 单双向两种不同振动模式下黏土强度弱化试验研究 |
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| 引用本文： | 谢琦峰,刘干斌.单双向两种不同振动模式下黏土强度弱化试验研究[J].水文地质工程地质,2017,0(5):66-66. |
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| 作者姓名： | 谢琦峰 刘干斌 |
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| 作者单位： | 宁波大学岩土工程研究所, 浙江 宁波315211 |
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| 基金项目： | 国家自然科学基金项目资助(51478228)；浙江省新苗人才计划资助（2016R405074） |
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| 摘 要： | 以宁波④2层黏土为对象，在单双向两种不同振动模式下，通过不同围压及不同动应力比条件下的动三轴剪切试验，研究宁波软土的动力特性以及振后强度弱化特性。试验结果表明:单向振动模式下(不产生拉应力)产生的动弹性模量衰减、累积塑性应变比双向振动条件下(产生拉应力)的发展显著，但双幅弹性应变发展较弱；在振后剪切阶段，双向振动使得试样产生拉应力，振后抗剪强度弱化比单向振动明显；单向振动模式下，试样发生剪胀，围压越大，剪胀程度减弱直至消失，孔压-轴向应变曲线存在峰值，表现出类超固结土特性；确定了在两种振动模式下，适用于宁波④2层黏土的振后弱化参数。
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| 关 键 词： | 动三轴试验 振后剪切 振动模式 应力路径 弱化参数 |
| 收稿时间： | 2017-04-02 |
| 修稿时间： | 2017-05-05 |
An experimental study of the strength weakening characteristics of clay under two different vibration modes |
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| XIE Qifeng,LIU Ganbin.An experimental study of the strength weakening characteristics of clay under two different vibration modes[J].Hydrogeology and Engineering Geology,2017,0(5):66-66. |
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| Authors: | XIE Qifeng LIU Ganbin |
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| Institution: | Institution of Geotechnical Engineering, Ningbo University, Ningbo，Zhejiang315211, China |
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| Abstract: | Cyclic triaxial tests and post-triaxial shear tests of the Ningbo clay are carried out to examine the effects of different vibration states, confining pressures and dynamic stress ratios on the dynamic characteristics and the post-vibration strength weakening characteristics of soil. The results show that the development of dynamic elastic modulus and cumulative plastic strain under one-way loading (no tensile stress) is more significant than that under two-way loading (resulting in tensile stress). But the development of elastic strain is opposite. In the shear stage, there is a peak at the pore pressure-axial strain curve and shear dilatation of the specimen, which shows the characteristics of the over-consolidated soil. Decrease in the shear strength under two-way loading is more obviously than that under one-way loading because of the tensile stress. The post-vibration strength weakening parameters under two vibration mode of the Ningbo ④2 clay are determined. |
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