该文通过对大直径预应力混凝土管桩力学性能满足设计要求的抗弯试验,反映出大直径预应力混凝土管桩替代钢桩的优越性“,”The deformation of a large diameter rock socketed pile is relevant to the socketed character of pile shaft under the action of horizontal loading. The model experimental results show that the socketed character of the pile shaft interposes between the hinged joint and rigid joint in practice actually. Through the detailed studies on shearing force and bending moment of the embedded sections of pile shaft in a deepgoing way and the calculations of some cases, we found that the socketed character is weakly affected by its shearing force but strongly affected by bending moment. So, the conclusion that the socketed character of pile shaft should be determined by bending moment, diameter and depth of embedded sections is presented in the paper.