水下砂土层非线性动力反应的直接差分法

Adirect differential method for nonlinear dynamic response of sand layer under water

应用多孔介质动力学进行了水下的砂土地层的动力反应分析,水下砂层可以看作是多相介质,孔隙水是可压缩的,土壤采用了非线性本构,考虑了砂土的刚度退化和剪胀性及土水相对运动等因素,并研究了多孔介质波动模拟的边界条件,建立了水体下地层平面动力非线性动力反应的直接差分法,直接求解水体的压力和饱和土层的动孔隙压力,可以进一步分析水下砂土地震液化问题。

Based on K.Terzaghi's soil mechanics model and taken account of soil dynamic nonlinear constitutive relation,soil shear dliatancy,rigidity degradation,hysteresis and water-soil relative motion,multi-phased medium dynamics theory is used to analyze the wave propagation and dynamic response of sand layers under water,and an artificial boundary condition is analyzed to simulate the wave propagation in pore medium. A set of dynamic equations of soil layers under water are established,and the equations are discreted to be used to analyze the earthquake engineering problem of soil under water,a direct differential method is suggested to calculate the water pressure and porewater pressure and to study the sand seismic liquefaction under water.