岩土力学2024，Vol.45Issue(3)：750-758,787,10.DOI:10.16285/j.rsm.2023.0465
局域共振超材料表面波屏障带隙特性与隔振性能
Band gap characteristics and vibration isolation performance of locally resonant metamaterial surface wave barrier
摘要
Abstract
To effectively address the issue of ground vibration induced by the rail transit,a locally resonant metamaterial surface wave barrier(LRMB)vibration isolation method was developed based on the concept of acoustic metamaterials,and the structure model was constructed using concrete and rubber pad.According to the theory of elastic dynamics in semi-infinite space,an analytical calculation formula for LRMB bandgap was derived,and the influences of rubber pad and concrete on LRMB bandgap characteristics was analyzed.The vibration isolation performance of LRMB was further analyzed based on the measured ground vibration induced by the rail transit.The results show that the generation of LRMB surface band gap is mainly related to its vertical vibration,and the band gap calculation method for LRMB assuming vertical vibration mode is accurate.Increasing the thickness of the rubber pads decreases the starting frequency of the bandgap and increases its width.Conversely,increasing the width of the rubber pads increases the starting frequency of the bandgap and decreases its width.Additionally,increasing the mass of the concrete decreases the starting frequency of the LRMB bandgap and increases its width.The vibration isolation efficiency can be improved by increasing the number of primitive cells and the vibration isolation coefficient with 4-6 cells reach 20-25 dB.Using Jinan Rail Transit Line 1 project as an example,the ground vibration attenuation can reach 70％-80％after using LRMB,validating its strong vibration isolation performance.关键词
声学超材料/表面波/波屏障/带隙特性/隔振性能Key words
acoustic metamaterial/surface wave/wave barrier/band gap characteristics/vibration isolation performance分类
交通工程引用本文复制引用
厉超,庄培芝,李利平,张思峰,周冲..局域共振超材料表面波屏障带隙特性与隔振性能[J].岩土力学,2024,45(3):750-758,787,10.基金项目
山东省自然科学基金资助项目(No.ZR2022QE082).This work was supported by the Shandong Provincial Natural Science Foundation(ZR2022QE082). （No.ZR2022QE082）
