Subscour Displacement in Clays From Physical Model Tests

Author:

Been Ken1,Sancio Rodolfo B.1,Ahrabian Djavid2,van Kesteren Walther3,Croasdale Ken4,Palmer Andrew5

Affiliation:

1. Golder Associates Inc., Houston, TX

2. Agip KCO, London, UK

3. Deltares, Delft, The Netherlands

4. K.R. Croasdale & Associates, Calgary, AB, Canada

5. National University of Singapore; Bold Island Engineering, London, UK

Abstract

A subscour soil displacement model is a key component to determine the safe burial depth of offshore pipelines in ice scoured environments. In order to calibrate numerical models and physical tests carried out in geotechnical centrifuges, 3D ice scour tests were carried out in a dredging flume at a scale approaching that of observed scour depths in the Caspian sea. Two soil failure mechanisms were observed. For steep keels, the soil is mainly pushed up into a mound in front of the keel. For shallow angle keels most of the scoured soil is forced under the keel and to the side of the indentor. Each mechanism results in a different subscour displacement pattern. Subscour displacement equations that include the effect of soil properties and keel angle are presented. While these equations are considered an improvement on existing sub-scour models, there remain limitations to their application in 3D sub-scour until further information relating scour depth and width to soil strength becomes available.

Publisher

ASMEDC

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