超长PHC管桩嵌固深度研究

Research on embedded depth of super-long PHC pipe pile

高桩码头结构计算时可以先把基桩在某深度处固定进行上部结构计算,再把计算的桩顶内力作为荷载施加到桩上进行桩-土相互作用分析。理论上讲,以简化前后的桩顶水平位移相等为条件确定嵌固点位置最为合理,但实际中难以实现。结合现场试桩资料,深入分析了超长桩在水平荷载作用下的嵌固特性,提出了嵌固深度随荷载变化的经验计算公式,实例计算结果表明效果良好。

The structural calculation of high pile wharf could starts with the upper structure calculation by fixing the pile at a certain depth, and is followed by the analysis of pile-soil interaction by applying the calculation of internal force as a load to the pile. In theory, the most reasonable location for the embedded point can be identified under the condition that the horizontal displacement of pile top equals before and after simplification, but in practice it is difficult to achieve. Combining with the data of the field loading test, this paper conducts an extended analysis of the embedding characteristics of the super-long piles under the horizontal load and puts forward the experience formula of the embedded depth which changes with load. Calculation results show that the effect is satisfactory.