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首页> 外文期刊>International journal of geomechanics >Deformation Behaviors and Dynamic Backbone Curve Model of Saturated Soft Clay under Bidirectional Cyclic Loading
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Deformation Behaviors and Dynamic Backbone Curve Model of Saturated Soft Clay under Bidirectional Cyclic Loading

机译：双向循环荷载作用下饱和软黏土的变形行为和动态主干曲线模型

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摘要

Many undrained cyclic triaxial tests considering cyclic confining pressure have been carried out on Ningbo saturated soft clay using a cyclic triaxial system to study the influence of cycle numbers, stress paths, and cyclic stress ratios (CSRs) on the axial strain. The experimental results showed that the development of the accumulated axial strain of saturated soft clay is limited by cyclic confining pressure to some extent under undrained condition. For a given number of cycles, the accumulated axial strain increases as CSR increases at the same slope of loading path, and decreases with the increase of the slope of loading path at the same CSR. As the slope of stress paths decreases, the inclination of the backbone curve of the specimen toward the horizontal axis decreases in the undrained condition. A backbone curve model incorporating the effect of cyclic confining pressure and vibration number is proposed based on the characteristics of the resulting dynamic stress-strain curve. The proposed backbone curve agrees well with experimental data and can be applied under undrained and partially drained conditions.
机译：利用循环三轴系统对宁波饱和软黏土进行了许多考虑循环围压的不排水循环三轴试验，以研究循环数，应力路径和循环应力比（CSR）对轴向应变的影响。实验结果表明，在不排水条件下，饱和软黏土累积轴向应变的发展在一定程度上受到循环围压的限制。对于给定的循环次数，在相同的加载路径下，累积的轴向应变随着CSR的增加而增加，而在相同的CSR下，随着加载路径的斜率的增加而减小。随着应力路径的斜率减小，在不排水的情况下，试样的主干曲线向水平轴的倾斜度减小。根据所产生的动应力-应变曲线的特征，提出了一种结合了循环约束压力和振动次数的主干曲线模型。拟议的主干曲线与实验数据非常吻合，可以在不排水和部分排水的条件下使用。

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    《International journal of geomechanics》 |2020年第4期|04020016.1-04020016.12|共12页
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  • 作者单位

    Chinese Acad Sci Inst Rock & Soil Mech State Key Lab Geomech & Geotech Engn Wuhan 430071 Peoples R China|Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China|Chinese Acad Sci Inst Rock & Soil Mech Hubei Key Lab Geoenvironm Engn Wuhan 430071 Peoples R China|Ningbo Univ Technol Soft Soil Res Ctr State Key Lab Geomech & Geotech Engn Ningbo 315211 Peoples R China;

    Chinese Acad Sci Inst Rock & Soil Mech State Key Lab Geomech & Geotech Engn Wuhan 430071 Peoples R China|Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China;

    Hunan Univ Coll Civil Engn Changsha 410082 Hunan Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Ningbo clay; Cyclic confining pressure; Cyclic stress ratio; Cumulative axial strain; Backbone curve model;

    机译：宁波黏土;循环围压;循环应力比;累积轴向应变;骨干曲线模型;

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