双层地基极限承载力的数值分析

Numerical analysis about the ultimate bearing capacity of two-layer foundation

基于极限平衡滑移线理论,采用差分算法及土层交界面处理公式编制了适合上层软、下层硬(饱和粘土除外 )的土层组合的双层地基数值计算程序 .由程序得到了均质地基和双层地基的滑移线网和承载力曲线 ,揭示出双层地基承载力明显高于均质粉土地基承载力 .

On the basis of limit equilibrium slip lines method theory,a numerical calculation procedure than fits the twolayer foundation of weak soil overlying strong soil(except saturated clay)is developed through using difference algorithm and the formulas dealing with twolayer soil's border.Slip lines net and bearing capacity curves are obtained from the calculation procedure which reveal the conclusion than the bearing capacity of double layer ground is apparently higher than the homogeneous powder soil foundation.