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文章对振冲法首次用于加固松砂坝壳试验中所观测到的振动孔隙水压力做了系统地整理分析,得出如下初步结果:振动孔隙水压力u_(am)与振源距离R及液化度L_d与水平距D均以幂函数形式衰减;振动孔隙水压力u_(am)与振动加速度a_m、液化度L_d与振动加速度a_m及液化度L_d与相对密度D_r均以幂函数形式增长。分析还得出,“起始液化”和“完全液化”时的振动加速度分别为0.4g和0.9g;以及停振后剩余超静孔隙水压力u_(ar)的消散过程及不同消散度所需时间的表达式。上述结果可供类似工程确定振冲参数时参考。
In this paper, the vibration pore water pressure observed for the first time by the vibration-impulse method is systematically analyzed and the following preliminary results are obtained: the vibration pore water pressure u_ (am) and the vibration source distance R and The liquefaction degree L_d and the horizontal distance D both decay in the form of power function. Vibration pore water pressure u am and vibration acceleration a_m, liquefaction degree L_d and vibration acceleration a_m, liquefaction degree L_d and relative density D_r all increase by power function. The analysis also shows that the vibration accelerations of “initial liquefaction” and “complete liquefaction” are 0.4g and 0.9g, respectively; and the dissipation process of residual excess pore water pressure u_ (ar) and the different dissipation Expression of time. The above results can be used for similar projects to determine the vibration parameters for reference.