群桩的沉降分析一直沿用共同作用系数概念 ,并把两根桩之间的共同作用系数推广到群桩中。由于这种分析方法没有考虑单桩 P- S曲线的非线性特性 ,计算结果使部分桩的承载力大于单桩的极限承载力 ,这显然是不合理的 ,本文通过引入单桩静载荷试验的 P- S曲线 ,对弹性方法进行改进 ,使计算结果更符合实际 Settlement analysis of pile groups has always been to use the concept of co-acting coefficient, and the common interaction coefficient between two piles is extended to the group pile. Because this method does not consider the nonlinear characteristics of P-S curve of single pile, it is obviously unreasonable to calculate the bearing capacity of some piles more than the ultimate bearing capacity of single pile. In this paper, by introducing the static load test of single pile P-S curve, the elastic method is improved to make the calculation more practical