吸力基础沉贯过程中桶?土界面力学机理研究进展?

吸力式桶形基础在海洋工程特别是作为海上风力发电机的基础中得到越来越广泛的应用,其沉贯能力是保证桶形基础下沉到预定位置,达到承载力要求的关键。分析了沉贯过程中桶?土界面力学机理的研究现状,讨论了不同土质、模型尺寸、渗透系数等对桶?土界面力学机理的影响,对理论计算、试验和数值模拟等研究方法进行分类总结。发现对于吸力基础在负压沉贯过程中的研究多是针对沉贯阻力和临界吸力的计算,很少对沉贯过程中桶?土界面力学机理进行细观研究,尤其是对桶?土界面力学特性的影响因素进行定量分析少有论述。指出了在研究吸力基础沉贯特性和桶?土相互作用机理的理论分析、模型试验及数值模拟中的本构模型等方面存在的问题。最后,对吸力基础沉贯过程中桶?土相互作用机理的进一步研究进行了展望。

Review of Mechanical Mechanism of Bucket-soil Interface During Installation of Suction Caissons

Suction caissons are widely used in ocean engineering,especially as the foundations of off?shore wind turbines. Its penetration is a key factor to ensure that the foundation is driven into a desiredposition in the seabed and meets the bearing capacity requirement. This paper presents an overview ofthe research works on the mechanical mechanism of the bucket-soil interface during installation of suc?tion caissons,discusses the effects of different soil qualities,model sizes,and permeability coeffi?cients on its mechanical mechanism,and also summarizes the research methods,such as theoreticalcalculations,experiments,and numerical simulations. It is found that the studies on suction caissonsin the process of negative pressure penetration have mostly focused on the calculation of penetration re?sistance and critical suction. However,few microscope studies are carried out in this area,especiallyfor the quantitative analysis of mechanical characteristics of interface between soil and structure. Theproblems in studying the penetration characteristics of suction caissons are pointed out. The shortcom?ings in studying the bucket-soil interface mechanical mechanism are discussed,including theoreticalanalysis,model tests and constitutive models in numerical simulation. Finally,further research on thebucket-soil interface mechanical mechanism during installation of suction caissons is prospected.