| 循环荷载下饱和软黏土的动骨干曲线模型研究 |
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| 引用本文： | 张勇,孔令伟,李雄威.循环荷载下饱和软黏土的动骨干曲线模型研究[J].岩土力学,2010,31(6):1699-1704. |
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| 作者姓名： | 张勇 孔令伟 李雄威 |
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| 作者单位： | 1. 浙江工业大学,建筑工程学院,杭州,310032;中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉,430071
2. 中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉,430071 |
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| 基金项目： | 国家自然科学基金，岩土力学与工程国家重点实验室重点项目，浙江省教育厅资助项目 |
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| 摘 要： | 通过饱和软黏土室内不排水动三轴试验,研究了循环周次和动应力幅值对土体动力特性的影响。结果表明,在循环荷载作用下,随着循环周次的增加,土体均存在不同程度的刚度软化现象。根据动应力幅值大小的不同,循环荷载作用下饱和软黏土的动应变发展形态可分为3种类型:稳定型、破坏型和临界型。根据动应力-应变关系曲线特点,提出了含动应力幅值、固结围压和循环周次等影响因素的动骨干曲线模型。该模型所得的拟合值与试验值比较吻合。与传统骨干曲线模型相比,该模型能够体现土体在循环荷载作用下的刚度软化特性,更加切合实际。
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| 关 键 词： | 软土 循环荷载 动三轴试验 动应力 动应变 骨干曲线 |
| 收稿时间： | 2009-08-30 |
Dynamic backbone curve model of saturated soft clay under cyclic loading |
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| ZHANG Yong,KONG Ling-wei,LI Xiong-wei.Dynamic backbone curve model of saturated soft clay under cyclic loading[J].Rock and Soil Mechanics,2010,31(6):1699-1704. |
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| Authors: | ZHANG Yong KONG Ling-wei LI Xiong-wei |
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| Institution: | 1. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310032, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | To investigate the influence factors of the soil dynamic properties under cyclic loading, a series of undrained dynamic triaxial tests are conducted at different cyclic stress levels, cycle numbers and confining pressures. The test results show that while being subjected to cyclic loading, the soil’s stiffness softening occurs more or less when the cycle number increase. There are three types of double amplitude strain of saturated soft clay under cyclic loading with different dynamic stress levels, such as stable type, destructive type and critical type. A new backbone curve model concerning cycle number, confining pressure, and cyclic stress level, is constructed to consider the stiffness softening feature of remoulded soil subjected to cyclic loading. Compared with the traditional backbone curve model, the simulative results computed from the dynamic backbone curve model, which can reflect the phenomenon of stiffness softening feature of soil, agree well with the experimental data. |
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| Keywords: | soft clay cyclic loading dynamic triaxial test dynamic stress dynamic strain backbone curve |
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