Suction Anchor Penetration

112 Pages·2017·2.91 MB·English

by  André Mikkelsen Nårstad

Suction Anchor Penetration
Estimating Penetration Resistance Based on
CPT Sleeve Friction
André Mikkelsen Nårstad
Geotechnics and Geohazards
Submission date: June 2017
Supervisor: Gudmund Reidar Eiksund, IBM
Co-supervisor: Gisle Håland, Statoil
Norwegian University of Science and Technology
Department of Civil and Environmental Engineering

i
Preface
The master thesis is written during the 4th semester at Norwegian University of Science and
Technology in Trondheim and counts for 30 points of study. Duration of the work is set to 20
weeks,andlastfrom15thJanuaryto10thofJune. Thethesismarksthelastsemesterofthemas-
terprogramGeotechnicsandGeohazards.
The idea for this thesis was made by Gisle Håland from Statoil, which also have been the co-
supervisorduringthisthesis.
The use of suction anchors has increased the last decades, and have become a widely used
method mooring floating offshore platforms to the seabed. When installing suction anchors
theneedtoknownecessarysuctiontoreachwanteddepthsisoftheessence. Atthetime, this
is estimated based on thorough soil investigation which increase installation costs. The thesis
goal is to check if there is a possibility to estimate suction based on measured sleeve friction
fromCPT.
AndréMikkelsenNårstad Trondheim,10thJune2017
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iii
Acknowledgment
Iwouldliketosendmygratitude’stoGisleHålandatStatoilforsuggestingthisinterestingtopic.
Withouthissupportandguidancethisthesiswouldhavebeenimpossibletocompletethisthe-
sis.
I would also thank Professor Gudmund Reidar Eiksund at NTNU, for the guidance I have re-
ceivedandforholdinghisdooropenatanytimewhenIneededanswertoquestions.
Iwouldalsosendmythankstomyfellowstudents,forthegoodtimesduringlunchandcontri-
butiontoagoodsocialenvironmentduringthewritingofthisthesis.
A.N.
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