高速铁路空沟减隔振措施数值分析与模型试验

空沟减隔振措施由于隔振效果明显、施工方便而在高速铁路减隔振工程中得到广泛应用。通过有限元软件ABAQUS对距离振源一定远固定位置处的振动情况进行数值分析,并通过缩尺模型试验分析相似工况下空沟减隔振措施的减隔振效果以及影响其减隔振效果的因素。对比分析结果表明:设置空沟可有效地阻隔振动波在土体中的传播,使土体的振动加速度明显减弱;空沟深度对距离振源一定远固定位置处的减隔振效果影响显著,设置空沟减隔振措施可使该区域的振动加速度衰减20%~60%;空沟宽度对距离振源一定远固定位置处的减隔振效果影响不明显,宽度的增加不能很好地降低该区域的振动加速度。

Numerical Analysis and Model Test of Vibration Reduction by Open Trench on High-Speed Railway

Open trench has been widely used in high speed railway track vibration reduction due to its effectiveness and easy construction. This paper focuses on the numerical analysis of vibration reduction at the fixed location a certain distance from vibration source with finite element software ABAQUS. Under similar condition,the effect of vibration reduction by means of open trench is analyzed and the influencing factors are identified through scale model tests. The results of comparative analysis show that the propagation of vibration wave in the soil can be effectively blocked by open trench and the vibration acceleration is obviously slowed down; the depth of open trench impacts greatly the effect of vibration reduction at the fixed location a certain distance from the vibration source,and the vibration acceleration attenuation of the area can be reduced by 20% ~ 60%; the width of the open trench has less impact on vibration reduction at the fixed location a certain distance from vibration source and the increase of the width of the area can hardly reduce the vibration acceleration l.