Duxseal隔振性能数值分析与现场试验研究

将一种称为Duxseal的工业填料用于自由场主动隔振,发展了一种带孔波阻板(WIB)填充Duxseal的隔振方法,即Duxseal-WIB隔振系统。采用薄层法基本解答作为格林函数的三维半解析边界元法,分析了Duxseal的隔振效果及性能,并对提出的Duxseal-WIB隔振系统进行了现场试验。结果表明,采用Duxseal作为主动隔振屏障可以有效起到振动隔振作用,对距离振源较远处地表位移的隔振效果优于距离振源较近处;土质参数的变化对Duxseal的隔振效果具有显著的影响;在一定范围内增加Duxseal直径、厚度或埋深均可有效提高其隔振效果,其中Duxseal顶面距地表埋深的影响尤为显著;此外,与传统WIB对比,Duxseal-WIB隔振效果较高且相对平稳,在列车运行250 km/h条件下,距离振源中心12 m处测振点X、Y、Z向的地表隔振可分别达到40%、39%和51%。

Numerical analysis and field experiment on vibration isolation for Duxseal

Thanks to the excellent damping capacity of Duxseal, a newly designed active isolating barrier-Duxseal-WIB is proposed to be used for vibration screening. This barrier is a special type of WIB (wave impeding block) with cylindrical holes and the holes are filled with Duxseal. To investigate the isolation characteristics of Duxseal, numerical studies are firstly performed using a three-dimensional semi-analytical boundary element method (BEM) combined with a thin layer method. Then, the vibration screening effectiveness of the proposed isolating barrier-Duxseal-WIB is verified by field tests. The results show that Duxseal can effectively reduce ground vibrations as an active barrier in the free field, and the effectiveness of vibration isolation at distances far away from the vibration source is relatively better than that near the vibration source. The values of soil parameters have a significant influence on the isolation effectiveness of Duxseal. The isolation effectiveness increases with the increase in diameter, thickness and embedded depth of Duxseal material within a certain range, and the embedded depth is the most critical factor affecting the isolation effectiveness of Duxseal. In addition, the isolation effectiveness at a distance away from the center of the vibration source is higher for Duxseal-WIB than traditional WIB. When we consider a distance of 12 m away from the vibration source as the representative measuring point, the vibration screenings of Duxseal-WIB along the X, Y, and Z directions achieve vibration isolation values of approximately 40%, 39%, and 51%, respectively, under a moving load at a high speed of 250 km/h.