基于p-y曲线法的群桩基础受力分析

Force Analysis of Group Piles Foundation based on p-y Curve Method

由于采用p-y曲线计算的桩头位移不是水平力和弯矩单独作用时产生位移的简单叠加,故首先利用有限差分法得到桩身各等分点处的地基反力系数,再通过传递矩阵法求得各桩头刚度系数,最后经过整体迭代循环计算,将p-y曲线应用于群桩基础受力分析。通过实例对比,本方法的计算结果与有限元分析结果吻合;该方法与m法对比分析结果表明,采用m法计算的桩位移和内力偏于不安全。

When p-y curve is applied to mechanical analysis of group piles,the pile-top displacement is not sum of displacements induced by force and moment.Therefore,the finite difference method is firstly employed to get modulus of foundation support of each point.The stiffness coefficient of each pile-head is then determined by the transfer matrix.Finally,the iterative circulation calculation is processed by p-y curve method based on the above two steps.It is shown that the results obtained by the method mentioned in this paper agree with those by finite difference method.In addition,by comparing with the method mentioned,the displacement and the internal force obtained by the ＂m＂ method is not safe.