地铁运行时连续屏障隔振效果数值分析

Numerical Analysis on the Vibration Isolation Effect of Continuous Barrier under Subway Loads

摘要: 选取武汉地铁2号线和4号线某区间四孔交叠隧道为研究对象，运用ANSYS 14.0有限元软件建立了土体–隧道–屏障的三维有限元模型，分析四孔交叠隧道地铁运行时连续屏障的隔振效果，以及连续屏障隔振效果与屏障宽度，屏障深度和屏障刚度的关系。分析结果表明：设置连续屏障时，屏障前存在一个振动放大区域；屏障宽度不同，隔振效果也不同，宽度增加，隔振效果增强；屏障深度增加，隔振效果越明显，但当屏障深度超过振源深度时，屏障深度增加，隔振效果不明显；空沟隔振效果最好，其次为泡沫阻隔板，混凝土地下连续墙。

Abstract: 3D finite element model of soil-tunnel-barrier was established by ANSYS 14.0 under the back-ground of certain four-holes overlapping multi-tunnels of Wuhan metro line 2 and line 4. The iso-lation effect of continuous barrier when subway operates; and the relationship between isolation effect and width of barrier, depth of barrier, as well as stiffness of barrier were analyzed. The results showed that an enlarged vibration region existed in front of barrier when continuous barrier was set; the barrier width was different, and the vibration isolation effect was also different; the isolation effect was enhanced if the width of barrier increased; the isolation effect was obvious if the depth of barrier increased, but the isolation effect was not obvious with increasing depth of barrier when barrier depth was deeper than vibration sources; the isolation effect of open trench was the best, the second was foam barrier plate, and the last was concrete underground continuous wall.