In practical engineering, the pile foundation is often subjected to lateral load while bearing vertical load. And the lateral and vertical bearing capacity of pile generally are calculated separately during the design of pile, without considering the effect of existing vertical load on the lateral capacity of pile. Based on the theory of elastic foundation beam, the stress in the pile units of laterally loaded pile under existing vertical load are analyzed, the pile-soil friction effect, p-Δ effect and the effect of existing vertical load on soil resistance are considered comprehensively. The p-y curve formula of sand considering the effect of existing vertical load is introduced, and the theoretical calculation model of lateral capacity of pile under existing vertical load is established. The corresponding program is compiled through MATLAB software. The mechanical response of pile is obtained, and the effects of different existing vertical loads on the lateral capacity of pile are compared. By comparing the theoretical calculation result with the experimental result, the applicability of the proposed method is verified.

在实际工程中，桩基经常承受横向载荷，同时承受垂直载荷。而且，桩的横向和竖向承载力通常在桩的设计过程中分别计算，而不考虑现有的竖向荷载对桩的横向承载力的影响。基于弹性地基梁理论，分析了既有竖向荷载作用下侧向荷载桩的桩单元应力，综合考虑了桩土摩擦力效应，p-Δ效应和既有竖向荷载对土抗性的影响。 。该PY引入考虑了已有竖向荷载作用的砂土曲线公式，建立了已有竖向荷载作用下桩体侧向承载力的理论计算模型。相应的程序是通过MATLAB软件编译的。得到了桩的力学响应，并比较了不同的已有竖向荷载对桩侧向承载力的影响。通过将理论计算结果与实验结果进行比较，验证了该方法的适用性。