| 循环荷载下饱和重塑黏质粉土的动力特性研究 |
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| 引用本文： | 谢琦峰,刘干斌,范思婷,郑荣跃,郭?华.循环荷载下饱和重塑黏质粉土的动力特性研究[J].水文地质工程地质,2017,0(1):78-83. |
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| 作者姓名： | 谢琦峰 刘干斌 范思婷 郑荣跃 郭?华 |
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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(51278256；51478228)；浙江省新苗人才计划（2016R405074） |
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| 摘 要： | 选取宁波饱和重塑黏质粉土，开展了黏质粉土的动三轴试验，研究了围压、动应力、排水条件、温度及频率等因素对土动力特性的影响，提出了采用相对动应力来分析不同围压、不同动应力下土的累积塑性应变变化规律，并建立了孔压—累积塑性应变关系的经验公式，结果表明:累积塑性应变随着相对动应力的增大而增大；温度越高，累积塑性应变值越小，且相同温度增量（△T=15℃）条件下的累积塑性应变增量也随之减小；建立的孔压-累积塑性应变经验公式可用于长期振动荷载作用后黏质粉土的孔压计算。
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| 关 键 词： | 动三轴试验 相对动应力 经验公式 温度 |
| 收稿时间： | 2016-10-17 |
| 修稿时间： | 2016-11-03 |
A study of dynamic characteristics of the saturated remolded clayey silt under circle load |
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| XIE Qifeng,LIU Ganbin,FAN Siting,ZHENG Rongyue,GUO Hua.A study of dynamic characteristics of the saturated remolded clayey silt under circle load[J].Hydrogeology and Engineering Geology,2017,0(1):78-83. |
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| Authors: | XIE Qifeng LIU Ganbin FAN Siting ZHENG Rongyue GUO Hua |
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| Affiliation: | Institution of geotechnical engineering, Ningbo University, Ningbo，Zhejiang315211, China |
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| Abstract: | Cyclic triaxial test of Ningbo saturated remolded clayey silt is carried out to study the effects of confining pressure, dynamic stress, drainage condition, temperature and frequency on the dynamic characteristics of soil. The relative dynamic stress is proposed to analyze the variation of cumulative plastic strain under different confining pressure and dynamic stress. Establish an empirical formula for the relationship between pore pressure and accumulated plastic strain. The results show: When the dynamic stress, related to confining pressure, reaches a certain level, the cumulative plastic strain suddenly become larger and the sample is not destroyed. The greater the relative dynamic stress, the greater the cumulative plastic strain. The empirical formula of pore pressure ~ cumulative plastic strain can be used to calculate the cumulative plastic strain of clayey silt after long-term vibration load. Finally, the decrease amplitude of cumulative plastic strain becomes more and more small with the increase of temperature under the same temperature gradient (15℃). |
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