淤泥质海床上人工岛水流冲刷试验

摘要

Local scour of the Hong Kong-Zhuhai-Macao bridge artificial island is a key technical problem to be solved in bridge project design. . Based on the field data analysis and physical model validation, using the normal extension method of series models, we study the flow pattern variation and local scour around the artificial island. The results show that in the flood season of spring tide situation, the maximum scouring depth of the east andwest island is 10.3 m and 9.0 m respectively, and the scour concentrates in the island bridge and tunnel with protective section and near the anti-collision pier;The maximum scour depth relates to the artificial island geometry, flow velocity, sand characteristics of the engineering water area and depth of such related, and the scouring plane form relates to the island type, flow angle, speed difference of the rising and falling tide, and tidal duration as well.%　　港珠澳大桥人工岛局部冲刷是大桥工程设计亟待解决的关键技术问题。在现场资料分析与物理模型验证的基础上，采用正态系列模型延伸法，在潮汐宽水槽中研究了淤泥质海床上人工岛周围流态变化和局部冲刷的发展过程。研究结果表明，在洪季大潮情况下，东、西人工岛最大冲深分别为10.3 m和9.0 m，冲刷坑集中在岛桥结合部和隧道防护段及防撞墩附近；最大冲刷深度与人工岛的几何形状、流速、工程水域的沙土特性以及水深等相关，冲刷坑的平面形态则与岛型、水流夹角、涨落潮流速差以及潮流历时有密切关系。