| 摘要: |
| 杭州湾跨海大桥海中平台位于杭州湾大桥中间位置，海中平台下部群桩结构与平台上游各系列匝道墩、大桥主墩形成了复杂的墩群结构，受其影响，海中平台区域海床冲刷较为剧烈。为深入了解海中平台区海床冲刷特性，本文应用多年实测地形测量资料，对海中平台区的海床地形特征、建桥前后海床冲淤变化规律进行了研究，研究了各匝道墩最低冲刷高程分布情况，并应用数值计算模型分析了海中平台区的水动力分布特征，揭示了匝道墩海床冲刷机理。研究发现，与建桥前相比，海中平台区大桥轴线上游500m ～下游1000m范围内海床发生整体一般冲刷，在海中平台南北两侧，受局部绕流影响，产生明显的局部冲刷，最大冲刷幅度近14m。平台南北两侧向上游延伸的局部冲刷槽影响到平台上游的匝道墩，导致部分匝道墩附近海床高程普遍较深。整体来看，位于桥轴线上游的ZB和ZC系列匝道墩因受到海中平台绕流及主墩绕流的叠加影响，而导致其最低海床高程要明显深于位于桥轴线下游的ZD和ZE系列匝道墩，各匝道墩最低海床高程分布与涨潮流流速大小分布具有一定的相关性。 |
| 关键词: 杭州湾跨海大桥 海中平台 匝道墩 冲刷特性 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学(51609214, 41876095，52078461),浙江省水利科技计划项目(RB1903,RC1907) |
|
| Study on Characteristics of Seabed Scouring in Platform Area ofHangzhou Bay Bridge |
|
WANG Jinquan1, LI Zuisen2, SHEN Xiang1, CHEN Jian1, SHI Yongzhong3, ZHANG Zhiyong3
|
|
1.Ningbo Hangzhou Bay Bridge Development Co,Ltd;2.Zhejiang Institute of Hydraulics and Estuary（Zhejiang Institute of Marine Planning and Design）;3.Zhejiang Institute of Hydraulics and EstuaryZhejiang Institute of Marine Planning and Design,Hangzhou,Zhejiang China
|
| Abstract: |
| The Sea platform of Hangzhou Bay sea-crossing bridge is near the center of Hangzhou Bay bridge. The pier groups under platform combined with ramp piers and main bridge piers compose complex bridge pier groups which induce significant scour around sea platform. In order to deeply understand the scour characteristics around the sea platform, based on field data, the scour characteristics around sea platform, the seabed evolution and minimum elevation of ramp piers were analyzed. In addition, the hydrodynamic characteristics around sea platform was also studied using numerical simulation. The research result shows that there is general scour in the region between upstream 500m and downstream 1000m, and in each side of sea platform, there is local scour which the maximum scour depth is nearly 14m.The scour hole extend to upstream region and induce some ramp piers scour depths are also deeper. In general, the scour depths of ZB and ZC ramp piers in upstream region were deeper than those of ZD and ZE ramp piers. This may because the upstream ramp pier was affected not only by both sea platform but also main bridge piers. The distribution of minimum scour elevation of each ramp piers has relationships with the distribution of spring tidal current. |
| Key words: Hangzhou Bay Bridge Sea Platform Ramp Pier Characteristics of Seabed Scouring |
