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利用薄层元素法和有限单元法,对层状地基中桩筏基础的动力阻抗进行了分析。比较了桩筏基础和群桩、筏板基础的水平阻抗、竖向阻抗以及摇摆阻抗,并讨论了地基的层状结构对桩筏基础的动力阻抗的影响。结果表明:桩筏基础的水平阻抗和筏板基础的比较接近,而竖向阻抗、摇摆阻抗和群桩的比较接近。地基的层状结构使得桩筏基础的阻抗发生波状变动,在低频区域表现为刚度增大,阻尼减小。
The dynamic impedance of piled raft foundations in layered soils is analyzed by means of thin element method and finite element method. The horizontal impedance, vertical impedance and swaying impedance of piled raft foundation, pile foundation and raft foundation are compared. The influence of the layered structure of foundation on the dynamic impedance of piled raft foundation is also discussed. The results show that the horizontal impedance of the piled raft foundation is relatively close to that of the raft foundation, while the vertical impedance, the rocking impedance and the pile groups are relatively close. The layered structure of the foundation causes the impedance of the piled raft foundation to fluctuate in a wavy manner. In the low frequency region, the stiffness increases and the damping decreases.