强潮高浊度海域坐底结构物稳定性分析  

Stability analysis of seabed structures in macro⁃tidal turbid sea waters

作　　者：刘炬 王少华[1] 李莉[1] 孙红月[1] LIU Ju;WANG Shaohua;LI Li;SUN Hongyue(Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316021

出　　处：《海洋工程》2021年第3期118-126,共9页The Ocean Engineering

基　　金：国家重点研发计划项目(2016YFC1401202);国家自然科学基金项目(41772276,41976157,5171101179)。

摘　　要：为满足强潮高浊度海域海底观测网布设需求,以潮动力强、泥沙浓度高的舟山群岛螺头水道为例,研究坐底结构物的稳定性。对3种形状的观测网坐底混凝土结构体进行计算分析,结果表明3种结构体抗滑安全系数2.22~7.40,抗倾覆安全系数1.59~1.64,沉降14.32~43.60 mm,地基承载力符合规范要求。针对冲刷可能导致的结构倾斜,建立结构体泥沙冲淤三维数值模型,分析了3种结构体的局部微流场与底床冲淤特性。模型结果表明,3种观测网坐底结构体在强潮流高浊度海域中符合稳定性要求,其中圆台结构体的稳定性最好。In order to meet the requirements of the submarine observation network in macro⁃tidal turbid coastal seas,the Luotou channel of Zhoushan Islands was selected as an example to study the stability of the platform structure.Three types of concrete seabed substructure were designed.The results of theoretical calculation show that the factors of safety against sliding are ranged from 2.22 to 7.40;the factors of safety against overturning are between 1.59~1.64;and the subsidence values are between 14.32~43.60 mm.The bearing capacity of foundation conforms to the specification.In view of the structural inclination caused by erosion,this study established a three⁃dimensional numerical model using Flow⁃3D to investigate the sediment erosion and siltation around the structures.The results of the model show that the three seabed substructures meet the stability requirements in the macro⁃tidal turbid seas,and the circular truncated cone structure is the most stable.

关 键 词：坐底结构物 稳定性 冲淤变化 高浊度 强潮海域 舟山群岛 螺头水道 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]