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中文摘要：
空沟是一种常用的连续隔振屏障，可以有效地降低人工振动。以位移为变量的二维格子法在波动问题计算中具有良好的适应性、高效性，兼备有限元与差分法的一蝗优点，应用该法针对层状地基中作用于路堤上的交通荷载引起振动的空沟竖向隔振问题进行了参数研究，分别考虑了上软下硬地基和上硬下软地基两种情况。研究结果表明：空沟宽度对隔振效果的影响较小；空沟深度与空沟的位置是影响隔振效果的关键因素，它们相瓦关联，其取值应综合考虑：在上述两类层状地基中，若空沟深度与上层土的厚度接近或相等均对竖向隔振不利；路堤高度越大对竖向隔振效果越不利。
英文摘要：
Open trenches are continuous barrier, which are widely installed for efficiently reducing man made vibration. The 2D grid method using displacements variables is flexible and efficient to calculate wave propagation problems, combining the merits of finite elements method and finite difference method. Using the method, the parametric study is conducted herein for vertical vibration isolation by open trenches in layered ground under traffic loading acting on the top of an embankment. The rigid upper layer with soft lower layer ground model and soft upper layer with rigid lower layer ground model are considered respectively. The results show that the width of the open trench has little influence on the screening effectiveness. The depth and location of the open trench are most crucial for the screening effectiveness and they associate each other; so the value of them should be determined comprehensively. The depth of the open trench is equal or close to the thickness of the upper layer is detrimental to the vertical vibration isolation. Higher embankment can give rise to bad influence for vibration isolation in vertical direction.
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