碎石桩复合地基中超孔压长消的解析解

针对单桩碎石桩复合地基的不同边界条件,将作为力源项的动孔压增长率表达成为深度z与时间t的函数,利用分离变量法和Green函数给出了动静荷载耦合作用下碎石桩复合地基中超孔隙水压力长消的一般性解析解。通过工程算例,对地震期碎石桩复合地基中超孔隙水压力的发展过程进行了讨论。计算结果表明:地震期复合地基中孔压比的分布规律沿深度方向不同,中部孔压比较大,上、下部孔压比较小;碎石桩的径向排水效应十分明显;碎石桩排水效应的影响程度沿深度方向不同。

Analytic Solution Research of the Generation and Dissipation of Excess Pore Pressure in Stone Columns Composite Foundation

Based on different boundary condition of single stone column composite foundation,the dynamic pore pressure increasing ratio as force source was expressed as a function of depth z and time t,using separation of variables and Green function,the general analytic solution of the generation and dissipation of excess pore water pressure in stone column composite foundation was developed under coupling action of dynamic and static loading.Developing process of excess pore water pressure was discussed by one case history.The results show: the distribution of pore pressure ration in composite foundation is different along depth,the pore pressure ration is bigger in middle and smaller in upper and lower;The radial drainage effect of stone columns is remarkable.The influence of drainage effect of stone columns is different along depth.