桥区航道整治工程对大型船队过桥影响的数值分析*

针对武汉长江大桥4#桥孔枯水期航行环境比较复杂的状况,航道主管部门拟对航道进行整治工程。武汉长江大桥是一个斜交桥梁,斜交桥梁的实际可通航净宽计算有其特殊之处。根据对拟建武桥航道整治工程后的桥区水流数值模拟,并将水流数值模拟结果应用于桥区通航孔实际可通航净宽的计算中。综合考虑武汉长江大桥所处的航道条件及大桥桥墩的方位尺度,结合桥区紊流宽度水槽试验结果,对桥区通航孔实际可通航净宽进行了计算。将计算结果与GB 50139—2004《内河通航标准》中对大型船队通过单孔单向通航桥梁所需净宽的规定比较,桥区通航水流条件及实际可通航净宽满足代表船型的安全航行需求。

Numerical analysis of influence of channel regulation engineering at bridge site on large fleet passing bridge

Since the navigation environment is complex when large fleets passing the No.4 navigable bridge opening of Wuhan Yangtze River bridge during low-water season,a waterway regulation engineering is going to be performed.The numerical simulation of flow field is simulated and analyzed before and after the waterway regulation engineering,and the results are applied to computational analysis the width of actual navigable waters in the No.4 navigable bridge opening.Based on the numerical computation results,the waterway conditions,aperture of bridge piers,and results of flume tests,the width of actual navigable waters are calculated.Compared with the requirements of one way single navigation span in the instructions of the Navigation Standard of Inland Waterway(GB 50139—2004),the research results show that the flow condition and the width of actual navigable waters are adequate.