基于铁路环境振动的隔振堤数值分析

为减小铁路运营引起的环境振动,提出了一种新的隔振方法——隔振堤.建立了隔振堤-土体-路基的二维有限元计算模型,研究了隔振堤材料、坡角、地基土性质、隔振堤的中空大小、转角数量对铁路环境振动隔振效果的影响.结果表明:隔振堤的材料弹性模量越大,场地土体的弹性模量越小,其隔振效果越好;陡坡角隔振堤在近隔振堤区域的隔振效果更明显,但中坡脚和缓坡脚隔振堤在远侧的隔振效果更好;中空对隔振堤的隔振效果几乎没有影响;随着隔振堤转角数量的增加,非振动放大区内隔振堤的减振效果更好.

Study on vibration isolation dyke based on railway environmental vibration

A vibration isolation dyke is proposed to reduce the railway environmental vibration. A two-dimensional finite element model of embankment -soil-vibration isolation dyke is was established, and the influences of the material, slope angle, soil properties, inner hollow size of the vibration isolation dyke, number of turning angles are were studied. The results show that the isolation effect is better when vibration isolation dyke with greater elastic modulus and the first layer of the soil with lower elastic modulus; the isolation effect of steep slope angle vibration isolation dyke is more obvious in the area near the vibration isolation dyke, but the isolation effect of middle slope angle and gentle slope angle vibration isolation dyke is better in the far side; the inner hollow of the vibration isolation dyke has no effect on the damping effect; in the non-vibration amplification area, as the corner of vibration isolation dyke increase, the damping effect of the vibration isolation dyke becomes better and better.