| 王 畅,赵 鹏,李 焱.跨山区航道桥梁改建工程水沙条件影响研究*[J].水运工程,2024,(1):113-119 |
| 跨山区航道桥梁改建工程水沙条件影响研究* |
| Influence of water and sediment conditions on reconstruction project of cross mountain canal bridges |
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| DOI： |
| 中文关键词: 山区航道 桥梁 通航净空尺寸 碍航紊流 |
| 英文关键词:mountain canal bridge navigation clearance dimension navigable turbulence |
| 基金项目:中央级公益性科研院所科研创新基金项目(TKS20230515)；天津市交通运输科技发展计划项目(2021-12) |
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| 中文摘要: |
| 山区航道通航尺度小、比降大、流速快、枯丰变化明显、水文情况复杂。丽水莲都碧湖大桥改建工程位于瓯江干流中游，其所跨河段现状航道和规划航道线路不同，桥梁建设需同时满足现状航道通航和预留规划航道发展空间两项要求，因此对桥墩的布置提出了更高的要求。通过对桥梁通航净空尺度的计算分析表明，规划航道布置在主桥主跨内满足通航要求，而现状航道布置在主桥左侧桥跨内时，左侧主墩位于现状航道边缘，将对现状船舶通航安全构成影响。采用平面二维水流泥沙数学模型，研究桥梁改建对现状航道和规划航道水流条件和泥沙冲淤的影响，并提出将现状航道向左侧疏浚拓宽4 m，以满足通航要求的改善措施，可为跨山区航道的桥梁改建工程解决方案提供借鉴。 |
| 英文摘要: |
| The navigation scale of mountain canal is small,with large gradient,fast flow velocity,obvious changes in dry and wet seasons,and complex hydrological conditions.The reconstruction project of Lishui Liandu Bihu Bridge is located in the middle reaches of the Oujiang River mainstream.The current and planned canal routes of the river section it crosses are different,and the bridge construction needs to meet both the requirements of current canal navigation and reserved planned canal development space.Therefore,higher requirements are put forward for the layout of bridge piers.Through calculation and analysis of the navigation clearance scale of the bridge,it is shown that the planned canal layout meets the navigation requirements within the main span of the main bridge,while the current canal layout is within the left span of the main bridge,and the left main pier is located at the edge of the current canal,which will have an impact on the navigation safety of the current ship.Using a planar two-dimensional flow and sediment mathematical model,the impact of bridge reconstruction on the current and planned canal flow conditions and sediment erosion and deposition is studied.Improvement measures are proposed to widen the current canal to the left by 4 meters to meet navigation requirements,which can provide reference for bridge reconstruction projects across mountainous areas. |
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