Effect of Cyclic Loading Frequency on Undrained Behaviors of Undisturbed Marine Clay   总被引：2，自引：0，他引：2  

陈云敏  姬美秀黄博 《中国海洋工程》2004,18(4):643-651

Based on a series of cyclic triaxial tests, the effect of cyclic frequency on the undrained behaviors of undisturbed marine clay is investigated. For a given dynamic stress ratio, the accumulated pore water pressure and dynamic strain increase with the number of cycles. There exists a threshold value for beth the accumulated pore water pressure and dynamic strain, below which the effect of cyclic frequency is very small, but above which the accumulated pore water pressure and dynamic strain increase intensely with the decrease of cyclic frequency for a given number of cycles. The dynamic strength increases with the increase of cyclic frequency, whereas the effect of cyclic frequency on it gradually diminishes to zero when the number of cycles is large enough, and the dynamic strengths at different frequencies tend to the same limiting minimum dynamic strength. The test results demonstrate that the reasons for the frequency effect on the undrained soil behaviors are beth the creep effect induced by the loading rate and the decrease of sample effective confining pressure caused by the accumulated pore water pressure.  相似文献   

不排水循环荷载作用过程中累积孔压对细砂弹性剪切模量Gmax的影响   总被引：1，自引：1，他引：0  

姬美秀  陈云敏 《岩土力学》2005,26(6):884-888

在土工结构物地震有效应力分析中,往往采用Hardin经验公式计算动荷作用过程中由于孔压变化对砂土初始弹性剪切模量Gmax的影响,但由于以往试验手段的限制,这种方法的有效性至今没有得到验证。为此,采用多功能三轴仪和压电陶瓷弯曲元剪切波速测试系统,研究了不排水循环荷载过程中孔压对细砂Gmax的影响。试验结果表明,细砂Gmax可由 Hardin型经验公式计算,但材料参数应通过试验确定;不排水循环荷载作用过程中,细砂Gmax随孔压上升而降低,其值可由其实际平均有效应力和固结后的孔隙比通过由试验得到的Hardin型经验公式计算。  相似文献   

基于matlab的探地雷达数据三维显示   总被引：1，自引：0，他引：1  

吴宝杰  姬美秀  杨桦 《物探与化探》2009,33(3)

借助于Matlab强大的图像处理功能,对探地雷达的数据进行三维显示,程序编写简单,易学易懂.对程序代码做了详细的说明,并三维显示试验数据,通过设置透明度,可直观、可视地显示目标物.  相似文献