关键词: 预应力管桩, 水平荷载, 弯矩, 加硬薄层, 数值模拟

Abstract: Combining the horizontal load tests and the numerical simulation results of prestressed prefabricated pipe piles at a construction site, the working mechanism of the prestressed prefabricated pipe piles under the horizontal load was analyzed. And the influence factors on the lateral load capacity characteristic of the prestressed prefabricated pipe piles were determined and selected. The numerical simulation was carried out specifically using the finite element method to study the influence of these factors on the lateral load capacity. The simulation results show that the hardened thin layer of soil, pile length, pile diameter, vertical load at the pile top, and pile cap at the pile top all affect the magnitude of the pile’s bending moment. Among them, the hardened thin layer will increase the bending moment value at the pile joint, and the pile length will increase the maximum lateral load capacity within a certain length. The increase in the pile diameter will increase the maximum bending moment value under the same horizontal load, and the increase in vertical load at the pile top will reduce the bending moment value at each position along the pile. In order to explore the influence of pile cap to the bending moment of the pile, the anchorage effect of the pile cap is analyzed, negative bending moments are distributed at the top of the pile and the upper side of the pile, and the larger the lateral soil constraint force at the pile cap, the larger the maximum negative bending moment value, and the pile displacement distribution pattern tends to the “retaining wall” pattern. 

Key words: Prestressed Prefabricated Pipe Pile, Lateral Load Capacity, Moment, Displacement