Numerical Simulation Study on The Degree of Submarine Cable Protection by Riprap Protection Layer Against Anchor

Abstract

Abstract Based on the discrete element theory, the rockfill-anchor-cable discrete element model was built on the PFC3D simulation platform. Combined with the engineering practice, numerical simulation of the penetration process of anchor into the submarine cable riprap protection layer was carried out, the relationship between force and displacement and the sidewall pressure of the submarine cable under the anchor partial penetration were obtained, and the anti-anchor damage ability of the submarine cable was evaluated quantitatively. The results show that the resistance force of the riprap to the anchor increases gradually with the increase of anchor invasive displacement, and eventually stabilize, which reflects the forming, developing, rupturing and restructuring process of the physical chain of the ripped-rock. Furthermore, the riprap protection layer has a significant protective effect on the submarine cable.