空沟和废弃轮胎填充沟隔振效果的有限元分析

Finite element analysis of vibration-isolation effects of open trenches and waste tire in-filled barriers

为评价地铁运营段空沟和橡胶轮胎填充隔振屏障的隔振效果,通过有限元数值模拟对连续屏障进行分析。分析了沟槽深度、宽度和不同废弃橡胶轮胎填充形式对隔振效果的影响。结果表明:隔振沟能够显著地减小土体和邻近建筑物的振动响应;空沟屏障隔振效果随着沟槽深度的增加而增加,但增加到一定深度后不会显著提升隔振效果,当隔振沟深度为6~9m时,能够达到较为理想的效果;空沟宽度的增加对隔振效果的提升并不明显,设置合理的沟槽深度即可满足隔振要求。在1~10Hz和15~25Hz频段内轮胎碎屑填充屏障的隔振效果最好,空沟隔振屏障在40Hz以上的高频部分隔振效果优于填充隔振屏障。

In order to evaluate the vibration isolation effect of the empty trench and rubber tire-filled vibration isolation barrier in the subway operation section,the continuous barrier through finite element numerical simulation was analyzed.The influence of groove depth,width and filling form of different waste rubber tires on the vibration isolation effect were analyzed.The results show that the vibration isolation trench can significantly reduce the vibration response of the soil and adjacent buildings;the vibration isolation effect of the empty trench barrier increases with the increase of the trench depth,but it will not significantly improve the vibration isolation effect after increasing to a certain depth When the depth of the vibration isolation trench is 6~9 m,a more ideal effect can be achieved;the increase in the width of the hollow trench does not significantly improve the vibration isolation effect,and a reasonable trench depth can meet the vibration isolation requirements.In the frequency bands of 1~10 Hz and 15~25 Hz,the tire debris-filled barrier has the best vibration isolation effect.The high-frequency part of the hollow-ditch vibration fisolation barrier above 40 Hz is better than the filled vibration isolation barrier.