法向承力锚极限抗拔力特性

法向承力锚是一种新型的适用于深海工程的系泊基础,其极限抗拔力是锚在工程应用中的关键指标。尝试用两种不同的方法评估法向承力锚的极限抗拔力,其一是基于塑性上限分析理论;其二是运用非线性有限元数值方法。与已有的经验公式相比,所建立的计算模型不仅可考虑海床土性质,还能反映锚板定位(嵌入深度及角度)以及系缆力角度对锚极限抗拔力的影响。在与已有评估方法进行比较的基础上,还特别对锚板的嵌入深度、角度以及系缆力角度变化对极限抗拔力的影响规律进行了分析,对三种方法的适用性进行了评述。

Characteristics of ultimate pull-out capacity for vertically loaded anchors

The vertically loaded anchor(VLA) is a new type of mooring foundations for deep-water offshore engineering.The ultimate pull-out capacity(UPC) is a key index of anchors in engineering applications.Two different ways are tried in this paper to establish the methods that can calculate the UPC of VLAs.One is based on the theory of upper bound of plasticity,and the other is using the nonlinear finite element method.Compared with the present evaluation method,the established methods described in the paper can take into account not only the properties of seabed soils but also the variations of the anchor position,including the embedment depth and fluke angle,and the action angle of mooring force.The proposed methods are investigated detailedly in the paper.The influences of the embedment depth,fluke angle and the angle of mooring force on the UPC are analyzed,and the applicability of the three methods is also summarized.