Cyclic deformation behaviour of natural K0-consolidatedsoft clay under different stress paths
Cyclic deformation behaviour of natural K0-consolidatedsoft clay under different stress paths
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不同应力路径下天然K(0)固结软土的循环变形行为
DOI：
10.1007/s11771-015-3034-4
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发表时间：
2015
影响因子：
4.4
通讯作者：
Guo Lin
中科院分区：
文献类型：
--
作者：
Sun Lei;Cai Yuan-qiang;Gu Chuan;Wang Jun;Guo Lin
轮过循环荷载的特点是无应力反转的单向荷载，包括垂直正应力和水平正应力同时循环变化，持续较长时间，一般发生在部分排水条件下。因此，根据交通荷载特点研究其变形行为具有重要的现实意义。在这项工作中，进行了一系列单向应力控制循环三轴试验，在循环加载过程中垂直和水平应力分量同时变化，以研究天然K0固结软粘土在部分排水条件下的变形行为。测试结果表明，不仅应力规则累积的偏差部分而且体积部分也有显着贡献。在应力幅偏量部分保持恒定的情况下，循环围压的增大幅值将显着促进永久体积应变和轴向应变的发展。此外，还量化了循环围压对天然K0固结软粘土变形的影响。最后，提出了考虑循环围压影响的永久轴向应变经验公式，可用于交通荷载作用下K0固结软粘土基础的可行性研究或初步设计。
Characteristic of cyclic loading due to passing wheels is associated with one-way loading without stress reversal, which includes a simultaneous cyclic variation of vertical normal stress and horizontal normal stress lasting for a long period of time and generally takes place in partially-drained conditions. Therefore, it is of great practical relevance to study the deformation behaviour according to the characteristic of traffic loading. In this work, a series of one-way stress-controlled cyclic triaxial tests with a simultaneous variation of the vertical and horizontal stress components during cyclic loading were conducted to investigate the deformation behaviour of naturalK0-consolidated soft clay in partially-drained conditions. Test results demonstrate that not only the deviator part of the stress rules accumulation but also the volumetric part significantly contributes. While the deviator part of the stress amplitude is held constant, the increase amplitude of cyclic confining pressure will promote the development of both permanent volumetric strain and axial strain significantly. Furthermore, the effects of cyclic confining pressure on the deformation of naturalK0-consolidated soft clay was quantified. Finally, an empirical formula for permanent axial strain considering the effects of cyclic confining pressure was proposed which can be used for feasibility studies or for the preliminary design of foundations onK0-consolidated soft clay subjected to traffic loading.