Pore water pressure increment model for saturated Nanjing fine sand subject to cyclic loading

查看全文 作　　者：Wang Binghui Chen Guoxing Jin [1]Dandan

机构地区：[1]Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China

出　　处：《Earthquake Engineering and Engineering Vibration》索引2010年第9卷第4期,共8页

基　　金：Key Research Project of National Natural Science Foundation of China Under Grant No.90715018;National Basic Research Program of China Under Grant No.2007CB714200;the Special Fund for the Commonweal Industry of China Under Grant No.200808022 摘　　要：Three groups of dynamic triaxial tests were performed for saturated Nanjing fine sand subjected to uniform cyclic loading. The tested curves of the excess pore water pressure (EPWP) ratio variation with the ratio of the number of cycles are provided. The concept of the EPWP increment ratio is introduced and two new concepts of the effective dynamic shear stress ratio and the log decrement of effective stress are defined. It is found that the development of the EPWP increment ratio can be divided into three stages: descending, stable and ascending. Furthermore, at the stable and ascending stages, a satisfactory linear relationship is obtained between the accumulative EPWP increment ratio and natural logarithm of the effective dynamic shear stress ratio. Accordingly, the EPWP increment ratio at the number of cycles N has been deduced that is proportional to the log decrement of effective stress at the cycle number N-1, but is independent of the cyclic stress amplitude. Based on the analysis, a new EPWP increment model for saturated Nanjing fine sand is developed from tested data fitting, which provides a better prediction of the curves of EPWP generation, the number of cycles required for initial liquefaction and the liquefaction resistance. 关键词：超孔隙水压力饱和砂土循环加载增量模型南京测试曲线罚款循环次数

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Pore water pressure increment model for saturated Nanjing fine sand subject to cyclic loading

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