饱和砂土地基三维地震响应分析

对饱和砂土地基进行了完全耦合的三维排水有效应力动力分析.探讨了不同输入地震加速度、不同土性参数和不同土层构成等因素对饱和砂土地基抗液化性能的影响.结果表明:在地震荷载作用下,天然饱和砂土地基的水平振动加速度沿深度方向自下而上被放大;在地震中,地基中超孔压比的分布规律基本是上下部较小,中部较大;土性参数对地基本身的哪抗液化性能有重要影响,初始孔隙比越小,相对密度越大,土体的抗液化能力越强;随输入地震加速度的减弱,由粘土和砂土构成的地基,在不同深度处的超孔压比基本保持不变,没有出现明显的超孔压消散现象.

Three Dimension Eearthquake Response Analysis of Saturated Sand Foundation

Saturated sand foundation is analyzed by the fully coupled three-dimension effective-stress dynamic analysis procedure.The influence of different input earthquake acceleration,soil parameter and different soil layers on antiliquefaction nature of liquefaction foundation is discussed.The research shows that under the earthquake loading,the horizontal vibration acceleration of natural saturated sand foundation is amplified from underside to upside;the regularities of distribution of excess pore water press ratio basically is big in intermediate foundation and small in upper and under foundation during earthquake;the soil parameter has much influence on the anti-liquefaction nature of foundation,the littler initial void ratio,the bigger relative density,the anti-liquefaction capability of sand is more strong;with decreasing of input earthquake acceleration,the excess water pore press ratio keeps constant in different deep layer of foundation composted by clay soil and sandy soil,and the dissipation of excess pore water press is not remarkable.