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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。
Through the undrained cyclic triaxial test and considering the effects of different cyclic stress levels and loading frequency, the pore water pressure and deformation characteristics of soft clay under cyclic loading are studied. The characteristics of these properties are discussed respectively with the cyclic loading time and loading times Different changes in law. The results show that for the same cyclic stress level, the characteristics of soft clay with different loading frequencies under the same loading times are different, while the properties of soft clay with different loading frequencies under the same loading time are basically the same. In addition, no matter what the loading frequency is, soft clay damage is bound to occur once the cyclic stress level exceeds the critical value. In order to further study the coupling effect of stress level and loading frequency, this paper analyzes the properties of soft clay from the strain rate in cyclic loading test of stress control. The results show that under the same stress level, the strain rates of soft clay under different loading frequencies are basically the same, and the effect of cyclic loading on the properties of soft clay can be obtained. The stress level is more important than the loading frequency .