| 研究生: |
陳憲儀 Chen, Xian-Yi |
|---|---|
| 論文名稱: |
含水膜包對振波阻隔效應之試驗研究 |
| 指導教授: |
倪勝火
Ni, Sheng-Huo |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 180 |
| 中文關鍵詞: | 振波阻隔 、槽溝 、隔振 、衰減 、阻尼係數 |
| 相關次數: | 點閱:95 下載:5 |
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本研究分別利用模型試驗及現地衰減試驗的方法,探討隔振物對地表振幅之阻隔效應與其衰減行為,在模型試驗中設置開口槽溝、填充膜包槽溝等隔振物,探討其對穩態振動及脈衝振動所引致的地表振幅之阻隔效應,而現地衰減試驗方面則是探討在穩態振動下振波衰減之機制。試驗研究使用之參數包括基礎振動頻率、填充材料及槽溝幾何形狀尺寸作為參數,量測結果以RMS dB、地表振幅降低比 與平均地表振幅降低比Ar來表示,並以槽溝幾何形狀參數與Ar之關係來探討填充膜包槽溝與空槽溝對振波的阻隔效果。
模型試驗結果顯示,在模型試驗中穩態振動下膜包槽溝欲達對振波的有效阻隔,則深度需達1.4倍之雷利波波長,對於空槽溝而言D(雷利波波長/槽溝深度)≧1.0即可有效阻隔振波;而脈衝振動下欲達振幅降低比0.4以下則膜包槽溝之深度需達到1.4倍雷利波波長。由試驗結果亦顯示,膜包槽溝對於振波阻隔效應與空槽溝相近且具效果。
現地衰減試驗顯示出阻尼係數會隨著頻率增加而增大,且能量愈大則阻尼係數相對的越大。對於不同振波形式其阻尼係數亦有所差別,而在同一種振動下,主出力方向之阻尼係數較大,若與文獻建議值比較,則在其範圍內但偏下限值。
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