圆柱桥墩清水局部冲刷透水三杆架体防护特性试验研究
发布时间：2018-11-27 19:34
【摘要】：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。
[Abstract]:In view of the good protective effect of the permeable three-bar frame in the application of bank protection engineering, this paper studies the near velocity, depth and density of the cylindrical bridge piers protected by the permeable three-bar frame through sloping flume test. The effect of the characteristic factors such as scour duration on the protective effect is analyzed. The protective characteristics and the optimum design range of the permeable three-bar frame are analyzed. The results show that the maximum impact depth increases with the increase of flow velocity and water depth when the layout density is the same, and the maximum impact depth around the pier can be effectively reduced by increasing the layout density when the water flow condition is constant. The change of water flow condition and arrangement density can not affect the protective effect after the volume ratio of permeable three-bar frame is greater than 0.229, and the permeable three-bar frame can effectively slow down the scouring process, and the maximum scour duration can be increased to 3.28 times of that without protection. The optimal design protection range can be selected between the maximum scour range and 2.8 times pier diameter under the protection of permeable frame with different density.
【作者单位】： 南通航运职业技术学院交通工程系;南通市水利勘测设计研究院有限公司;河海大学水利水电学院;
【基金】：交通运输部应用基础研究项目(2013329284210) 江苏省高校“青蓝工程”中青年学术带头人培养计划 江苏省交通科学研究计划项目(2013Y27-04) 南通市社会事业科技创新与示范计划(HS2012014)
【分类号】：U443.8
本文编号：2361825
[Abstract]:In view of the good protective effect of the permeable three-bar frame in the application of bank protection engineering, this paper studies the near velocity, depth and density of the cylindrical bridge piers protected by the permeable three-bar frame through sloping flume test. The effect of the characteristic factors such as scour duration on the protective effect is analyzed. The protective characteristics and the optimum design range of the permeable three-bar frame are analyzed. The results show that the maximum impact depth increases with the increase of flow velocity and water depth when the layout density is the same, and the maximum impact depth around the pier can be effectively reduced by increasing the layout density when the water flow condition is constant. The change of water flow condition and arrangement density can not affect the protective effect after the volume ratio of permeable three-bar frame is greater than 0.229, and the permeable three-bar frame can effectively slow down the scouring process, and the maximum scour duration can be increased to 3.28 times of that without protection. The optimal design protection range can be selected between the maximum scour range and 2.8 times pier diameter under the protection of permeable frame with different density.
【作者单位】： 南通航运职业技术学院交通工程系;南通市水利勘测设计研究院有限公司;河海大学水利水电学院;
【基金】：交通运输部应用基础研究项目(2013329284210) 江苏省高校“青蓝工程”中青年学术带头人培养计划 江苏省交通科学研究计划项目(2013Y27-04) 南通市社会事业科技创新与示范计划(HS2012014)
【分类号】：U443.8
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