采用有限单元法对不同筏板刚度下桩筏基础下卧层附加应力的分布规律进行分析。计算结果表明,筏板刚度对桩顶反力、桩端阻力和下卧层附加应力分布的不均匀性有很大影响,且在刚性基础中表现尤其明显。结合有限元法和Geddes公式的计算结果表明,筏板刚度还引起附加应力沿深度分布的变化及附加应力影响深度的变化。 The finite element method is used to analyze the distribution of additional stress in the subsurface layer of piled raft foundation under different raft stiffness. The calculation results show that the stiffness of raft has a great influence on the pile top reaction force, the pile end resistance and the uneven distribution of additional stress on the subsoil, especially in the rigid foundation. The calculation results of the finite element method and the Geddes formula show that the raft stiffness also causes the variation of the additional stress along the depth distribution and the influence of the additional stress on the depth.