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采用PLAXIS有限元分析软件建立数值模型,分析在竖向荷载与水平动力荷载耦合的情况下,桩基础的响应性状分布特征。结果表明,竖向荷载较小时,桩基的水平位移随着竖向荷载的增加呈减小的趋势;当竖向荷载较大时,横向位移响应随着竖向荷载的增大而增加;对于强度较低的桩基,竖向荷载成为影响水平承载力及变形性状的主要因素;循环水平荷载若长期作用于承受较大竖向荷载下的桩基,会使桩身出现反向弯曲变形。
The numerical model was established by PLAXIS finite element analysis software to analyze the distribution characteristics of response characteristics of pile foundation under the coupling of vertical load and horizontal dynamic load. The results show that when the vertical load is small, the horizontal displacement of pile foundation tends to decrease with the increase of vertical load. When the vertical load is larger, the lateral displacement response increases with the increase of vertical load. The pile foundation with lower strength and the vertical load are the main factors that affect the horizontal bearing capacity and the deformation characteristics. If the cyclic horizontal load acts on the pile foundation subjected to large vertical loads for a long time, the pile body will appear reverse bending deformation.