前排桩对桥墩周围水流通航条件影响分析  

Influence of sacrificial pile on the navigation flow condition around bridge piers

作　　者：胡旭跃[1,2] 钟佳昌 杨陆鑫 沈小雄[1,2] 程永舟[1,2] 余志[1,2] 

机构地区：[1]长沙理工大学水利学院,湖南长沙410004 [2]湖南省水沙科学与水灾害防治重点实验室,湖南长沙410004

出　　处：《水动力学研究与进展（A辑）》2015年第5期556-563,共8页Chinese Journal of Hydrodynamics

基　　金：交通部科技课题资助项目(20113280001570)~~

摘　　要：前排桩是保护桥墩及保障通航安全的一种工程措施。为了探讨前排桩对桥墩周围水流通航条件的影响,该文采用RNG、k-?紊流模型对通航水域的桥墩流场及受前排桩保护桥墩的流场进行三维数值模拟。计算了各种前排桩布置形式下的水流特性,并与无前排桩保护的桥墩流场进行了对比分析,同时还进行了物模试验论证。结果表明前排桩设置后,桥墩墩前横流得到有效降低,桥墩两侧流态得到改善,桥墩周围不安全通航区域范围得到有效缩减,不安全区域范围的缩减与前排桩数量及前排桩与桥墩间的距离等因素有关。在模型试验和计算条件下,桥桩距在两倍墩宽时,桥墩周围通航不安全宽度最大范围可被缩减26.4%。Sacrificial piles are the engineering measures which are built to protect bridge piers and to ensure navigation safety. To discuss the impacts of sacrificial piles on the navigation flow condition around bridge piers, a three-dimensional numerical simulation of the flow filed around the pier with sacrificial piles, based on the RNG and k - ω turbulence model, is established for calculation and analysis of the flow field characteristics under different arrangement of piles, and verifications of physical model experiments are also carried out. The results show that, after setting up sacrificial piles, the transverse flow in front of the pier has been effectively decreased, the flow pattern on both sides of the pier has been improved, the insecurity area of navigation around the pier has been effectively reduced, and the insecurity area is correlated with the quantity of piles and the distance between pier and piles. When the distance between the bridge pier and piles is placed two times the width of the bridge pier, the maxium insecurity width of navigation around the pier can be reduced 26.4% based on the computation and experiment results.

关 键 词：前排桩 桥墩 通航安全 数值模拟 

分 类 号：U617.9[交通运输工程—船舶及航道工程] TV131.4[交通运输工程—船舶与海洋工程]