基于带隙特性的周期性排桩隔振性能研究

Study on Vibration Isolation Performance of Periodic Row Piles Based on Bandgap Properties

采用有限元法计算二维声子晶体的带隙特性,并研究基体为粉质黏土、散射体为混凝土时正方格子二维声子晶体的XY模式的带隙变化规律。通过现场测试得到城市轨道交通运营引起近场土体的振动特性,并设计出相应隔振频段的排桩布置参数,计算分析排桩排数与隔振效果的变化规律。结果表明,隔振排桩对城市轨道交通运营引起的近场土体振动特征频带具有良好的减振效果。

The finite element method was used to calculate the bandgap properties of the two-dimensional photonic crystal.The bandgap variation of XY mode of the two-dimensional phononic crystals with square lattices was studied when the matrix was silty clay and scatters was concrete in this paper.The vibration characteristics of the nearby soil caused by the operation of the urban rail transit were obtained through field test,and the parameters of row piles arrangements with corresponding vibration isolation frequency band were designed. The variation of the row number and the vibration isolation effect were calculated.The results show that the vibration isolation piles have good vibration attenuation effect on the frequency band with vibration characteristics of the nearby soil caused by the operation of urban rail transit.