【摘要】 在假定复合地基桩土间竖向和切向变形协调以及应力平衡的基础上,用有效应力分析法建立了三维复合有限元模型。并令复合有限元模型的平均固结度等于单桩轴对称复合地基的平均固结度,从而反算出其在线性加荷情况下的渗透系数,把得到的渗透系数代入三维复合有限元模型中就可用于固结变形分析。算例分析表明,无论复合地基中的桩体是否打穿软土层,该方法都具有较好的计算精度,该方法较适用于对散体桩复合地基的固结分析。更多还原

【Abstract】 On the basis of assuming deformation consistence and stress equilibrium at the interface between piles and soil in composite foundation,three dimensional composite FEM model is established by effective stress analysis method in this paper. By assuming that the average consolidation degree in the model is equal to that in composite foundation,the permeability of the model is back calculated and the procedure of consolidation analysis for composite foundation is programmed at the same time. Numerical examples show that the proposed method is of good accuracy no matter whether piles in composite foundation penetrate subsoil or not,and is suitable for consolidation analysis of composite foundation with granular piles.更多还原