海岸软土地基桩-土相互作用的数值模拟及应用

桩基础是高桩码头整体结构受力的关键。通过建立桩-土的理论受力模型,对桩体、土体及其相互作用进行理论分析,采用傅里叶级数收敛法对对称的模型进行求逆简化,为计算机求解给定方向。在ANSYS有限元分析软件中通过APDL语言对桩-土相互作用模型进行编程化建模和加载,计算后得出桩体、土体的整体变形规律和桩侧摩阻随桩深的变化规律,将模型计算结果与现有的试验结论进行分析对比。结果表明:傅里叶级数收敛法在对称模型刚度矩阵求逆过程中可以将许多元素变为零,以增加计算机的计算效率;桩体、土体的整体位移在不同荷载作用下发生微小差异,桩土摩擦阻力呈分段线性分布,其中在入土深度32 m处应力达到最大值,在工程中应对该处布置更多纵向持力钢筋。

Numerical simulation and application on pile-soil interaction in coastal soft soil foundation

Pile foundation is the key to the whole structure of high-pile wharf.We establish pile-soil stress theory model,and analyze the pile,soil and their interactions in theory.Meanwhile,we apply the Fourier series convergence method to simply the symmetric inverse model for the computer to solve a given direction,use the language APDL on finite element analysis software ANSYS to build the pile-soil interaction model and load on it,conclude the regular on pile-soil overall deformation and side frictional resistance on pile with the depth,and compare the model results with the existing experimental results.The results show that Fourier series convergence method can change many elements into zero in the process of inversing stiffness matrix on symmetric model,in order to increase the computational efficiency of the computer.The overall displacement of pile and soil is small under different loads,and the friction resistance of pile and soil is piecewise linear,and the maximum stress reaches 32 m at the depth of embedment.In the project,more longitudinal bearing steel should be arranged.