港珠澳大桥沉管隧道深基槽回淤监测与分析

Back silting monitoring and analysis of deep foundation trench in the Hongkong-Zhuhai-Macao Bridge immersed tunnel project

港珠澳大桥沉管隧道位于珠江口海域,基槽回淤特征明显。通过多波束监测、泥浆密度探测、回淤物容重测量以及人工潜水探摸等多种方法,确定了基槽回淤厚度分布规律。根据基槽所处海域地貌格局、海洋流体动力、泥沙环境和淤积物特征以及卫星遥感图像,结合现场实际考察,明确了回淤物淤积原因及可疑来源,为防淤减淤提供科学依据。

The Hongkong-Zhuhai- Macao Bridge immersed tunnel is located in the Pearl River estuary, the foundation ditch back silting has obvious features. Through the multi-beam monitoring, mud density detection, bulk density measurement of back silting deposit, and artificial diving explored, we determined the back silting thickness distribution of foundation trench. According to the landscape pattern, marine hydrodynamic, sediment environment, deposited sediment characteristics, and satellite remote sensing images in the sea area of foundation trench, combining with the practical field investigation, we has been clear about the reasons for back silting material deposition and suspicious sources, which will provide a scientific basis for preventing and reducing silt sedimentation.