北坑水库泄洪对下游高速公路大桥桥墩的影响分析  

Analysis of the influence of Beikeng Reservoir flood discharge on downstream highway bridges abutments

作　　者：吴少玲 孔词 WU Shaoling;KONG Ci(Shenzhen Raw Water Co.,Ltd.,Shenzhen 518052,China;CISPDR Corporation,Wuhan 430010,China)

机构地区：[1]深圳市原水有限公司,广东深圳518052 [2]长江设计集团有限公司,湖北武汉430010

出　　处：《安徽水利水电职业技术学院学报》2024年第6期12-17,23,共7页Journal of Anhui Technical College of Water Resources and Hydroelectric Power

摘　　要：北坑水库下游约200 m处布置有潮惠高速公路,受汛期水库泄洪影响,公路中心段大桥桥墩基础局部冲刷现象严重,桥墩结构本身产生较大变形,可能影响大桥的正常运行。文章采用Fluent计算流水作用下桥墩所受升阻力,然后利用MIDAS Civil软件计算桥墩的位移及内力响应,根据软件内置功能获取构件控制截面的弯矩-曲率曲线,建立构件失稳的评判标准,评估桥墩的安全性。最后,采用解析公式对桥墩冲刷深度进行验算。结果表明,北坑水库建成及蓄水后,对紧邻中心段大桥的影响不大,桥墩不至于因为泄水而引起结构破坏,现有护坦防护措施设计合理,桥墩基础不会因冲刷而发生破坏。The Chao-Hui Expressway is about 200 m downstream from the Beikeng Reservoir,influenced by the reservoir flood discharge during flood season,the pier foundation of the center section bridge is subjected to severe local scour phenomenon and the pier structure itself produces large deformation,which may affect the normal operation of the bridge.In this paper,the lift force and drag force of the bridge pier under the action of flowing water are calculatedby adopting the software of Fluent.Then,the displacement and internal force of the bridge pier are calculated by MIDAS Civil software,the bending moment-curvature curve of the member control section is obtained through the build-in function,and the judging criterion of member instability were established to assess the safety of the bridge pier.Finally,the scour depth at the abutment was checking cal-culated using analytical formulas.The results show that,after the completion and impoundment of Beikeng Reservoir,its impact on the immediate center section bridge is not significant,the bridge pier does not cause structural damage due to the water discharge,the existing protection measures are reasonable,and the pier foundation will not be damaged due to scouring.

关 键 词：北坑水库 水库泄洪 桥墩冲刷防护 抗力验算 圆柱绕流 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]