水平荷载下单桩有限元模拟结合p-y曲线法分析

为了分析在水平荷载下单桩的横向响应问题,利用有限元程序ANSYS对桩土相互作用体系进行了三维有限元数值模拟,分析了土体是否考虑弹塑性、桩土之间是否考虑接触面等因素对单桩横向响应的影响。提出了有效模拟单桩横向响应的有限元模型;进一步提出了确定接触面刚度参数及p-y曲线地基反力系数修正接触面刚度参数的方法。最后进行了实例验证,得出了地基非线性因素的影响是不可忽略的重要结论,并有效提高了有限元模型的计算精度。

Analysis of Single Pile under Lateral Loads with Simulations by FEM in Combination of p-y Curve Approach

To analyze the transverse response of a single pile under lateral loads, the FEM software, ANSYS, was used to numerically simulate the 3D finite elements of the pile-soil interaction system to analyze the influence of such factors as elasto-plasticity of soil mass and interfaces between piles and soil upon the transverse response of single piles. A finite element model was established to effectively simulate the transverse response of single piles. Methods to determine the parameters for the stiffness of contact surface between piles and soil and to modify the parameters for the stiffness of contact surface between piles and soil by p-y curves were also presented. The analyses were finally verified by examples, which produced an important conclusion that the influence of the non-linear factors of a foundation should not be overlooked and effectively improve the calculated accuracy of finite element models.