循环荷载水平与加载频率耦合作用下的软粘土特性研究

发布时间：2018-02-27 17:29

本文关键词： 软粘土循环荷载孔隙水压力应变加载速率　出处：《工程力学》2014年10期 　论文类型：期刊论文

【摘要】：通过不排水循环三轴试验,并考虑不同循环应力水平及加载频率的影响,研究了软粘土在循环荷载作用下的孔隙水压力及变形特性,分别探讨了这些特性随循环加载时间和加载次数的不同变化规律。研究结果表明,对于相同循环应力水平,相同加载次数下不同加载频率的软粘土特性有所不同,而相同加载时间下不同加载频率的软粘土特性基本相同。此外,无论加载频率为何数值,一旦循环应力水平超过临界值,软粘土破坏必将发生。为了深入研究应力水平和加载频率的耦合作用,该文从应力控制循环加载试验中的应变速率着手,对软粘土的特性进行了分析。结果表明,在应力水平相同的情况下,软粘土在不同加载频率下的应变速率是基本相同的,由此可得对于软粘土在循环荷载作用下特性的影响,应力水平比加载频率更为重要。
[Abstract]:The pore water pressure and deformation characteristics of soft clay under cyclic loading are studied by using undrained cyclic triaxial test and considering the influence of different cyclic stress levels and loading frequency. The variations of these properties with cyclic loading time and loading times are discussed respectively. The results show that the characteristics of soft clay under the same cyclic stress level and different loading frequency are different. However, the properties of soft clay with different loading frequencies are basically the same at the same loading time. In addition, regardless of the loading frequency, once the cyclic stress level exceeds the critical value, The failure of soft clay is bound to occur. In order to study the coupling effect of stress level and loading frequency, the characteristics of soft clay are analyzed from the strain rate of stress controlled cyclic loading test. Under the same stress level, the strain rate of soft clay under different loading frequencies is basically the same, so it can be concluded that the stress level is more important than the loading frequency for the influence of the characteristics of soft clay under cyclic load.
【作者单位】：上海理工大学土木工程系;澳大利亚卧龙岗大学土木工程系;
【基金】：上海市教育委员会科研创新项目(14YZ081) 上海高校青年教师培养资助计划项目(slg13027)
【分类号】：TU411;TU44

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