Influences of stress magnitude and loading frequency on cyclic behavior of K-0-consolidated marine clay involving principal stress rotation
Influences of stress magnitude and loading frequency on cyclic behavior of K-0-consolidated marine clay involving principal stress rotation
复制标题
应力大小和加载频率对涉及主应力旋转的K-0固结海相粘土循环行为的影响
DOI：
10.1016/j.soildyn.2016.01.024
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发表时间：
2016
影响因子：
4
通讯作者：
Deng Peng
中科院分区：
文献类型：
--
作者：
Guo Lin;Chen Jinmei;Wang Jun;Cai Yuanqiang;Deng Peng
交通荷载引起主应力幅值的变化和主应力的旋转，在偏应力空间中形成心形应力路径。为研究交通荷载作用下天然粘性土的不排水特性，对温州海相粘性土进行了一系列循环扭剪试验。试件先进行K0固结，然后在不同的循环应力幅值和加载频率下进行剪切和压缩。试验结果表明，应力大小和加载频率对孔隙水压力的累积和应变发展都有显著影响。循环应力幅值越大，孔隙水压力越大，竖向应变越大。当循环应力幅值增大到一定值时，软粘土试样达到破坏状态。加载频率的降低会导致孔隙水孔隙度和竖向应变的增加。当外加应力较小时，磁滞回线几乎闭合。随着应力幅值的增加，滞回线的张开变得明显，这意味着塑性应变的增加。频率越高，产生的竖向弹性变形越小。与循环应力幅值相比，频率对回弹性能的影响并不显著。
Traffic load causes the change of magnitude and the rotation of principal stress and leads to a heart-shaped stress path in deviatoric stress space. To study the undrained behavior of natural clay under traffic load, a series of cyclic torsional shear tests were performed on Wenzhou marine clay. The specimens were firstK0-consolidated and then sheared and compressed under different cyclic stress magnitudes and loading frequencies. Experimental results show that both the stress magnitude and loading frequency have significant effects on accumulations of pore water pressure and strain development. Larger cyclic stress magnitude causes higher pore water pressure and larger vertical strain. The soft clay specimen reaches failure when the cyclic stress magnitude increases to a certain value. However, a decrease in loading frequency leads to an increase of pore water pore and vertical strain. When applied stress is small, hysteresis loop is almost closed. With the increase of the stress magnitude, the opening of hysteresis loop becomes clear, which means the increase of plastic strain. The higher the frequency is, the smaller the vertical elastic deformation is produced. Compared to cyclic stress magnitude, the impact of frequency on resilience behavior is not that significant.