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针对饱和粉细砂,利用双向耦合多功能剪切仪进行了均等固结条件下的循环耦合剪切试验。应用已有的动强度定义,着重研究了双向动荷载的相位差β,双向动荷载的幅值比值λ对砂土动强度及孔压特性的影响。实验结果表明,砂土液化动强度与相位差β及幅值之比λ密切相关,现有的动强度定义在复杂加载情况下具有一定局限性;双向动荷载相位差β以及幅值比值λ对孔隙水压力增长速度影响显著,但对归一化孔隙水压力发展模式没有显著的影响。
For saturated fine sand, the cyclic coupling shear test under the condition of equal consolidation is carried out by means of a two-way coupling multi-function shear apparatus. By applying the definition of dynamic strength, the influences of the phase difference β of bidirectional dynamic load and the amplitude ratio λ of bidirectional dynamic load on the dynamic strength and pore pressure of sand are emphatically studied. The experimental results show that the dynamic strength of sand liquefaction is closely related to the ratio of phase difference β to the amplitude λ, and the existing definition of dynamic strength has some limitations under complex loading conditions. The phase difference β and amplitude ratio λ The effect of pore water pressure on growth rate is significant, but it has no significant effect on normalized pore water pressure.