碎石桩加固可液化地基数值分析

Numerical Analysis of Liquefaction Foundation Reinforced by Stone Columns

对碎石桩加固可液化地基进行完全耦合的三维有效应力数值分析,主要探讨了碎石桩的抗液化作用机理及影响因素。结果表明:在地震荷载作用下,碎石桩复合地基表层的最大水平振动加速度、地表沉降量和水平位移明显减小,碎石桩的减震效应显著;随碎石桩渗透性的增加,地基表层的水平振动加速度峰值减小,超孔压比降低;碎石桩的排水效应十分显著,超孔压比在复合地基中呈中部较大,上、下部较小的分布规律。

Liquefaction foundation reinforced by stone columns is analyzed by the developed fully coupled three-dimension effective-stress numerical analysis procedure;anti-liquefaction mechanism and influencing factor of stone columns are discussed.The result shows that the surface maximum horizontal vibration acceleration of stone columns composite foundation,settlement and horizontal displacement decrease,the reduced vibration effectiveness of stone columns is very remarkable;with the permeability of stone columns increasing,the surface maximum horizontal vibration acceleration and excess pore water pressure ration decrease.The drainage effectiveness of stone columns is very remarkable,and the distribution of excess pore water pressure ration in composite foundation is bigger in middle,and smaller in upper and lower.