2D analysis of vibration-isolation efficiency of an open trench-wave impedence block barrier

In view of the control of ground vibration isolation, a novel type of vibration isolation barrier, open trench-wave impedence block barrier, is proposed. The vibration isolation performance is analyzed by numerical simulation. Firstly, the governing equation of a non-splitting perfect matched layer (PML) absorbing boundary is established in the frequency domain by using complex coordinate stretching. Secondly, using Galerkin approximation technology, the frequency-domain finite element method formula of the second-order non-splitting PML with displacement as the basic unknown quantity is given. Finally, through numerical examples, the influence of physical parameters (modulus ratio of foundation to wave barrier), geometric parameters (trench depth, wave impedence block depth) and load parameters (frequency of vibration source) on the vibration isolation performance are investigated. The results show that the open trench-wave impedence block barrier can effectively control the ground vibration caused by different frequency vibration sources.