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鉴于透水三杆架体在护岸工程应用中表现出的较好防护效果,通过变坡水槽试验研究了圆柱桥墩采用透水三杆架体防护后行近流速、行近水深、布设密度、冲刷历时等特征因素对防护效果的影响,并分析了透水三杆架体的防护特性及最优设计防护范围。结果表明,布设密度相同时桥墩前最大冲深随流速和水深的增加而增大,水流条件不变时增加布设密度能有效缩减桥墩周围最大冲深;透水三杆架体杆件体积率大于0.229后水流条件和布设密度的变化均不能影响防护效果;透水三杆架体能有效减缓冲刷进程,冲刷历时最大可增至无防护时的3.28倍;最优设计防护范围可在不同布设密度时透水架体防护下的最大冲刷范围和2.8倍墩径之间选取。
In view of the better protective effect of the three-way water-permeable frame body used in revetment project, the experiment of variable slope tank experiment is carried out to study the near-flow velocity, depth of water line, layout density, erosion duration and so on The influence of the characteristic factors on the protective effect and the protective characteristics of the three permeable three-pole frame and the optimal design protection range. The results show that the maximum redness before bridge piers increases with the increase of flow velocity and water depth when the layout density is the same. Increasing the layout density when the flow conditions are constant can effectively reduce the maximum penetration depth around the piers. After the flow conditions and the distribution of density changes can not affect the protective effect; permeable three rod body can effectively reduce the flushing process, the maximum duration of erosion can be increased to 3.28 times the time without protection; optimal design protection range at different layout density permeable frame Body protection under the maximum erosion range and 2.8 times the pier diameter between the selection.