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標題: Pier Scour Prevention with Ring Columns Protection Worksunder Unsteady Flows
作者: 王傳益
Chuan I Wang
Yong Rang Chen
Min Hong Yang
Chang Kuwi Lin
Ching Hao He
關鍵字: 環圈柱保護工;變量流;沖刷減緩率;Ring column protection works;Unsteady flow;Scour depth reduction rate
Project: 水土保持學報, Volume 47, Issue 3, Page(s) 1433-1448.


Heavy rainfall frequently occurs during the period of June to October in the summer in Taiwan due to the effects of typhoons and stagnation front. High flowsand typhoon-induced floods frequently result in severe bridge scours and pier foundation damages. For example, typhoon Kalmaegi(2008) and Morakot(2009) caused heavy damages on Ho-Fonbridge in the Da-jiariver and Shuang-Yuan bridge in theKao-Ping river, respectively.To protect the bridge foundation, the use of ring column as a pier scour countermeasure is reported. In this study, hydraulic model experiments with ring column protection works are carried out to search for the ideal arrangements to reduce the bridge scour. It can be served as a reference of design for relevant agencies.

A series of experiments were conducted with uniform sediment under the clear-water advanced unsteady flow conditions to evaluate the effectiveness of different ring column protection arrangements for protecting the bridge. Various parameters,including diameter(L/b=2、3、4), height(h=∆y、y、2y), ring columns protection works were considered in the experiments. Laboratory data are used to assess the influence of each parameter on reducing the kinetic energy of the flow and to propose optimal allocations. Research results show that the maximum scour depth in front of the pier with ring column protection work is less than that without protection work,indicating the ring column protection work obviously has the function of reducing pier scour. It is found that the best pier scour protection results can be obtained when the ring column protection works are set at a height of 3.6 times of the pier diameter, and a distance of 2 times of the pier diameter flow conditions.The corresponding scour depth reduction rate is 34.3%.
Appears in Collections:第47卷 第03期

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