依据扭剪振动原理,开发出剪切波速与振动三轴联合试验装置。进而针对取自20 多个工程场地、埋深在20 m 以内的12种大量原状砂土,分析了同一类土、在同一固结压力作用下,原状与重塑土样抗液化强度与其初始剪切波速之间的相关性。结果表明...依据扭剪振动原理,开发出剪切波速与振动三轴联合试验装置。进而针对取自20 多个工程场地、埋深在20 m 以内的12种大量原状砂土,分析了同一类土、在同一固结压力作用下,原状与重塑土样抗液化强度与其初始剪切波速之间的相关性。结果表明,当判别液化的应变标准不超过6%时,土的抗液化强度与其初始剪切波速之间存在良好的对应关系。当应变破坏标准超过6%,土的初始剪切波速与抗液化强度之间不具备唯一对应关系。展开更多
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 a...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 both 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 both the creep effect induced by the loading rate and the decrease of sample effective confining pressure caused by the accumulated pore water pressure.展开更多
文摘依据扭剪振动原理,开发出剪切波速与振动三轴联合试验装置。进而针对取自20 多个工程场地、埋深在20 m 以内的12种大量原状砂土,分析了同一类土、在同一固结压力作用下,原状与重塑土样抗液化强度与其初始剪切波速之间的相关性。结果表明,当判别液化的应变标准不超过6%时,土的抗液化强度与其初始剪切波速之间存在良好的对应关系。当应变破坏标准超过6%,土的初始剪切波速与抗液化强度之间不具备唯一对应关系。
文摘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 both 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 both the creep effect induced by the loading rate and the decrease of sample effective confining pressure caused by the accumulated pore water pressure.
