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首页> 外文期刊>Bulletin of earthquake engineering >Wave velocities depending on shear strain, directionality, and excess pore water pressure from wildlife liquefaction array
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Wave velocities depending on shear strain, directionality, and excess pore water pressure from wildlife liquefaction array

机译：来自野生动物液化阵列的剪切应变，方向性和过量孔隙水压的波速

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Data from the Wildlife Liquefaction Array, which is located at southern California's Imperial Valley in the USA, are analyzed. Variations in shear wave (V-s) and compression wave (V-p) velocities are identified during strong motions. Shear strains (gamma) are computed from recorded acceleration time series between the sensors. All these variables are compared with the ground-surface accelerations and excess pore water pressure ratio (R-u) at different depths. Results show that R-u starts to accumulate when gamma exceeds the threshold strain of 0.01-0.015%. V-s is negatively correlated to R-u and gamma. Further investigation shows that V-s degradation depends on maximum horizontal shear strain with the different azimuthal angles at the same time window. By contrast, V-s reduction with R-u is caused by the decrease in effective stress; hence R-u reduces V-s regardless of the azimuthal angles. V-p degradation is limited compared with that of V-s under strong shaking, indicating that the constrain modulus is determined by the combination of soil skeleton and pore fluid.
机译：对位于美国南加州帝国谷的野生动物液化阵列的数据进行了分析。在强震期间，确定了剪切波（V-s）和压缩波（V-p）速度的变化。根据传感器之间记录的加速度时间序列计算剪切应变（γ）。将这些变量与不同深度的地表加速度和超孔隙水压力比（R-u）进行了比较。结果表明，当γ超过0.01-0.015%的阈值应变时，R-u开始累积。V-s与R-u和γ呈负相关。进一步的研究表明，V-s退化取决于同一时间窗内不同方位角下的最大水平剪切应变。相比之下，R-u降低V-s是由有效应力的降低引起的；因此，无论方位角如何，R-u都会减小V-s。与强震动下的V-s相比，V-p降解有限，表明约束模量由土壤骨架和孔隙流体的组合决定。

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