摘要
为研究土拱效应对桩-土竖向纵波稳态振动响应的影响,首先建立桩-土系统振动响应模型,通过哈密顿原理以及变分法推导出桩体位移控制方程,并利用迭代算法求解解析解;然后采用有限元软件建模并对不考虑土拱效应下竖向纵波稳态振动响应的数值解与解析解进行对比分析,验证理论模型和数值模型的一致性和可行性;最后考虑土拱效应,通过数值模拟探究土拱效应对桩体振动位移响应的影响。结果表明:无量纲频率下,桩体长细比S1对桩体的位移振动响应有显著影响,土拱效应能够使桩体竖向振动响应的刚度增大,同时减小桩体的竖向振动位移响应的数值。
In order to study the influence of soil arching effect on steady-state kinematic response of pilesoil under vertical P-waves,1)The kinematic response model of pile-soil system was established.2)The displacement control equation of the pile body was derived by the Hamilton principle and the variation method.The iterative algorithm was used to solve the analytical solution.3)The numerical solution was obtained by finite element modeling,and the numerical solution of vertical longitudinal wave steady-state vibration response without considering soil arching effect was compared with the analytical solution so as to verify the consistency and feasibility of theoretical model and numerical simulation.4)The numerical simulation was carried out considering the soil arching effect to explore the influence of soil arching effect on the vibration displacement response of piles.The result shows that the slenderness ratio S1 of the pile has a significant impact on the displacement and vibration response of the pile under dimensionless frequency.The soil arching effect can increase the stiffness of the vertical vibration response of the pile and reduce the vertical vibration displacement response of the pile at the same time.
作者
蔡炎标
CAI Yanbiao(Poly Changda Engineering Co.,Ltd.,Guangzhou 510630)
出处
《公路交通技术》
2021年第S01期14-20,共7页
Technology of Highway and Transport
基金
国家重点研发计划项目(2017YFC0806000)
关键词
土拱效应
单桩
竖向压缩波
稳态振动响应
MATLAB迭代求解
soil arching effect
single piles
vertical P-waves
steady-state kinematic response
Matlab iterative solution
