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基于Reese建议的砂土p-y曲线,提出了适用于斜桩水平承载特性分析的修正p-y曲线及相应的有限元分析方法。根据桩前土体受力特点,假设桩前浅层土体达到极限破坏状态时桩侧被动破坏区为一个三维楔形体,采用极限平衡分析方法导出了斜桩桩侧极限土抗力表达式,对比研究了斜桩倾角、桩-土界面摩擦系数等因素对极限土抗力的影响规律,并给出了斜桩初始地基反力模量确定方法。在此基础上,修正Reese提出的直桩p-y曲线,提出了砂土地基中斜桩p-y曲线确定方法。利用虚功原理,导出了斜桩水平承载特性分析的有限单元列式,编制相应的分析程序,通过算例验证了方法的合理性和有效性。最后,采用修正的p-y曲线法对一离心机模型试验进行了模拟分析,结果表明,计算与试验结果吻合得很好。
Based on the p-y curve of sand recommended by Reese, a modified p-y curve suitable for analyzing the horizontal bearing behavior of inclined piles and the corresponding finite element analysis method are proposed. According to the mechanical characteristics of the pre-pile, assuming that the passive failure zone on the pile side is a three-dimensional wedge body when the pre-pile shallow soil reaches the ultimate failure state, the limit equilibrium analysis method is used to derive the ultimate soil resistance expression of the side-inclined pile. The law of influence of inclined pile inclination and friction coefficient between pile and soil interface on ultimate soil resistance is studied, and the determination method of the initial subgrade reaction modulus is given. On this basis, the p-y curve of straight piles proposed by Reese is amended and the method of determining the p-y curve of oblique piles in sandy soil is proposed. Based on the principle of virtual work, the finite element equations for the analysis of the horizontal bearing behavior of inclined piles were deduced. The corresponding analytical procedures were compiled. The rationality and effectiveness of the method were verified by an example. Finally, a modified p-y curve method was used to simulate a centrifuge model test. The results show that the calculated results are in good agreement with the experimental results.