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標題: Application of Ring Consolidation Works to Bridge Pier Protection
作者: 王傳益
C.Y. Wang
C.L. Chang
M.H. Yang
J.H. He
S.J. Lu
關鍵字: Sawtooth-type ring consolidation works;Pier scour depth reduction rate;Multiple regression;鋸齒式環圈固床工;沖刷減緩率;複迴歸
Project: 水土保持學報, Volume 47, Issue 2, Page(s) 1367-1382.
Recently, the extreme climate types occur frequently under the effect of climate change. In addition, the annual rainfall concentrates in the summer in Taiwan. Bed elevations of many rivers in western Taiwan lower down seriously, due to unbalanced sediment transport. It causes the scouring of the river bed around the pier, and results in the exposure of the pier foundation and impacts the safety of bridge.

The result shows that the consolidation works sets in downstream of the pier can uplift the water depth and decrease the energy of flow impacting bridge. The different configurations of consolidation works can reduce the maximum scour depth in front of the pier. When the sawtooth-type ring consolidation worksets at a distance of 1 time to the pier diameter, a height of half time to the pier diameter, a width of saw tooth of 0.8 time to the pier diameter, it is the optimal type among the experimental conditions conducted in this study. The optimal allocation (L/b=1, h/b=0.5, W/b=0.8) can reduce 57.3% of the pier scour depth reduction rate and 49.4% of scour hole volume reduction rate in downsteam of consolidation works. According to experimental data, we can obtain an empirical formula by using multiple regression. The R-squared value of function is 0.877. The maximum scour depth in front of pier can be predicted by this formula.


研究結果顯示,當設置固床工於橋墩下游處時,因固床工橫截水流抬升水位,降低流速使水流沖擊橋墩能量減弱,且能抑制橋墩周圍沖刷坑發展,進而減低向下射流造成橋墩墩前沖刷深度。綜合考量橋墩與固床工之安全性,本研究較佳配置型式為鋸齒式環圈固床工(L/b=1, h/b=0.5, W/b=0.8),能有效抑制橋墩周圍沖刷坑發展,其橋墩沖刷減緩率約57.3%,固床工下游沖刷坑體積減緩率約49.4%。此外,依試驗數據,利用複迴歸方法獲致經驗公式,並經驗證得判定係數R2=0.877,透過該公式可預測出橋墩墩前最大沖刷深度。
Appears in Collections:第47卷 第02期

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