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提出了一种分析筏－桩－土共同作用工作性状的实用计算方法—位移协调法［１］．该方法假定筏极与桩土地基位移协调，对矩形筏板根据其边界条件和变形性状采用一种双重三角级数位移模式．对拉土地基采用单桩计算方法—考虑桩压缩性的位移协调法［１，２］，分析桩土之间的相互影响。根据位移协调条件和力平衡条件建立筏－桩－土共同作用的分析方程．可求解筏板与桩土地基之间的接触应力、桩土地基的应力及沉降、筏板的沉降、弯矩、扭矩及应力和桩筏基础对周围环境的影响等．文中对桩筏基础、片筏基础及性承台的分析与设计具有理论与实用价值．
A practical calculation method for the analysis of working behaviors of concrete with pile-pile-soil is presented. The displacement coordination method [1]. This method assumes the coordination of the displacement of the squat and the pile foundation, and adopts a double triangular series displacement model for the rectangular stern plate according to its boundary conditions and deformation properties. The single pile calculation method for the grouting foundation—the displacement coordination method considering the compressibility of the pile[1,2]—is used to analyze the interaction between the pile and the soil. According to the displacement coordination conditions and the force balance conditions, the analytical equations for the joint action of pile-soil-soil are established. The contact stress between the seesaw and the pile foundation, the stress and settlement of the pile foundation, the settlement of the raft, the bending moment, the torque and the stress, and the influence of the pile-raft foundation on the surrounding environment can be solved. This paper has theoretical and practical value for the analysis and design of the pile-raft foundation, the rammed foundation and the platform.