本文研究主要是利用試驗的方法，在模型試驗砂箱中設置矩形開口槽溝、填充槽溝及中空圓管阻隔壁等土中障礙物，探討其對穩態振動所引致的地表振幅之阻隔效應。試驗過程使用之參數包括基礎振動頻率、振源位置、填充材料及槽溝幾何形狀尺寸作為參數，量測結果以地表振幅降低比 與平均地表振幅降低比 來表示，並以槽溝幾何形狀參數與 之關係探討土中障礙物之設計依據。
模型試驗結果顯示，土中障礙物欲達對振波之阻隔效果，振源與槽溝兩端夾角需大於或等於90度；開口槽溝之阻隔效果主要取決於深度參數，當其深度達1.2倍雷利波波長時，可當作開口槽溝有效阻隔之臨界值；填充槽溝之阻隔效果隨其深度與寬度增加而提升，保麗龍填充槽溝之阻隔效果欲達平均地表振幅降低比小於或等於0.25，其斷面積至少需1.56倍雷利波波長平方，而空心磚槽溝之斷面積為1.91倍雷利波波長平方時，可當作其對振波阻隔之臨界值。由試驗結果亦顯示，開口槽溝對振波之阻隔效果較填充槽溝為佳，對填充槽溝而言，保麗龍填充槽溝之阻隔效果略高於空心磚槽溝。

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