How to translate text using browser tools
1 January 2015 Theoretical Analysis and Model Test of Rock Berm Protection
Shuwang Yan, Bingchuan Guo, Liqiang Sun, Zhenming Lei
Author Affiliations +

Yan, S.; Guo, B.; Sun, L., and Lei, Z., 2015. Theoretical analysis and model test of rock berm protection.

Submarine pipelines are exposed to the risk of damage from dragged anchors of ships that lose control during severe storms. Rock armor berms are commonly employed to protect the pipelines by deflecting the dragged anchors. Theoretical work and model tests are implemented in this study to understand the protection mechanism provided by rock berms. A limit equilibrium method is proposed to address the interaction between the dragged Hall anchor and the developed soil wedges. The total drag force on the anchor is obtained as the sum of the drag force on the anchor crown and that on the anchor fluke. Model tests are performed with three model anchors with different linear scales. The drag forces measured in the model tests agree well with those calculated by the theoretical approach. Results show that when the anchor is dragged into the rock armor berm from the soil foundation, an unbalanced moment is induced on the anchor; this moment causes the dragged anchor to rotate and the fluke tip to rise up. Such prediction may be helpful to berm designers.

© 2015 Coastal Education and Research Foundation
Shuwang Yan, Bingchuan Guo, Liqiang Sun, and Zhenming Lei "Theoretical Analysis and Model Test of Rock Berm Protection," Journal of Coastal Research 73(sp1), 747-752, (1 January 2015).
Received: 7 August 2014; Accepted: 15 November 2014; Published: 1 January 2015
Dragged anchor
hall anchor
limit equilibrium method
model test.
rock armor berm
submarine pipelines
Get copyright permission
Back to Top