Prediction of Anchor Trajectory During Drag Embedment In Soft Clay

Abstract

This paper presents a method of trajectory prediction based on an upper bound collapse load analysis of the anchor together with published solutions for anchor line response. Inputs for the model include a dimensionless collapse load parameter and a critical inclination angle at which the collapse mechanism transitions from a translational to a rotational failure mode. The model also requires a user-specified initial entry angle of the fluke and the inclination of the anchor line at the seabed. Evaluation of the model from 2 case studies shows good agreement between computed and measured trajectories. Anchor characteristics, initial anchor orientation, and anchor line angle at the seabed significantly affect trajectory predictions.