摘要
港珠澳大桥东人工岛所在海域受水下地形和近岸边界影响呈“涨潮NE向、落潮SW向”的往复流特点,东人工岛岛隧结合部沉管基槽水域在岛头挑流作用下涨潮流呈N向流动。根据岛隧结合部区域的水流运动特征,制订了基槽掩护区南北两侧“非对称”型的双导流堤掩护措施。建立基槽局部水域的三维水流数学模型,模拟岛隧结合部水流运动的三维特征,对导流堤实施后的掩护效果进行水动力仿真模拟。研究结果表明:基槽掩护区内流速大幅减弱,E33管节基槽的人工整平段最大流速在0.5m/s以内,整平船施工段最大流速不超过0.8m/s,E33管节各区流速均能满足沉管安装的水流条件。为安全起见,E33管节沉放安装时机适合选在潮流动力较弱的小潮期。
The waters of the east artificial island of the Hong Kong-Zhuhai-Macao Bridge are characterized by the reciprocating flow of “the high tide in NE direction and the ebb tide in SW direction” under the influence of underwater topography and near-shore boundary. The sinking base water area of the east island tunnel-joint is at the island head. Under the action of picking up, the flood tied flows in N direction. According to the characteristics of water flow movement in the joint area of the island tunnel, the "Asymmetric" type double-drainage protective measures for the north and south sides of the basement shelter area were formulated. The 3-D mathematical model of water flow in the water area of local sinking base was established, and the 3-D characteristics of the water flow movement in the joint area were simulated. The hydrodynamic simulation of the drainage effect of the diversion dike was carried out. The results show that the flow velocity in the protected area of the basement is greatly reduced. The maximum flow velocity of the artificial flattening section of the E33 pipe joint base is less than 0.5 m/s, and the maximum flow velocity of the flattening ship construction section is not more than 0.8 m/s. The flow rate can satisfy the flow conditions of the immersed tube installation. For safety reasons, the small tide period with weaker tide flow is suitable for the placement of pipe E33.
作者
何杰
高正荣
辛文杰
沙海明
朱方剑
HE Jie;GAO Zhengrong;XIN Wenjie;SHA Haiming;ZHU Fangjian(Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;Key Laboratory of Port, Waterway and Sedimentation Engineering of the Ministry of Transport, Nanjing 210029, China;Taizhou Water Conservancy Burea, Taizhou 318000, China)
出处
《海洋工程》
CSCD
北大核心
2019年第5期89-98,共10页
The Ocean Engineering
基金
国家重点研发计划(2017YFC0405900)
关键词
港珠澳大桥
人工岛
岛隧结合部
掩护区
导流堤
沉管安装
Hong Kong-Zhuhai-Macao Bridge
artifical isand
island tunnel joint
shelter
diversion dike
immersed tube installation
