In-Situ Soil Testing _ Offshore testing _ Introduction.pdf
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Transcript of In-Situ Soil Testing _ Offshore testing _ Introduction.pdf
7/2/2015 InSitu Soil Testing | Offshore testing | Introduction
http://www.conepenetration.com/onlinebook/nearshoremarinetesting/introduction4/ 1/2
Lankelma is the foremostcontractor for onshore insitu soil testing in the UK. Anacknowledged specialist inCPT, Lankelma also offers aworldwide consultancy andtraining service.
A.P. van den Berg develops,designs and manufacturesgeotechnical andenvironmental soilinvestigation equipment foronshore and offshoreapplications. Specialists inCPT systems andequipment.
Gardline Geosciencesoffers worldwide marinegeotechnics, inhouseconsutancy and serviceswith marine investigationsranging from nearshore tofull ocean depth (down to3000m).
Hans Brouwer studied civilengineering at DelftUniversity in TheNetherlands. He hasworked as a parttimelecturer at AmsterdamPolytechnic and was seniorpartner in a structuralengineering consultancy. Hehas written a standardtextbook in Dutch about thedesign of buildingfoundations. He now lives inEngland where he writestechnical textbooks inEnglish, hopefully to reach abigger readership.
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Published ByLankelma
Gardline
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Quick Links: 10. Offshore testing
Chapter 10
Offshore testing
Chapter Contents:
10.1 Introduction10.2 Seabed cone penetration test systems10.3 Seabed soil samplers10.4 Seabed resistivity systems
Online Book | Offshore testing | Introduction
Introduction
INTRODUCTION 10.1
Further offshore, water depths are too great for jackups so vessels are
used. Two types of geotechnical investigation can be performed with a
vesselbased system: a seabed system or a drilling based system.
For static operations such as drilling and downhole CPTs, vessels with
the means to stay stationary have to be used. This can be achieved by
using mooring systems, or (more expensively) vessels with dynamic
positioning capabilities.
Drill ships need a moonpool (a hole in the ship’s deck) so that the work
can be carried out safely and efficiently. Occasionally a drill system will
be mounted on a cantilever platform over the side. A heave
compensation system is needed as well as a seabed reaction frame
(clamped around the drill pipe) for the CPTs. This heavy compensation
system is designed to keep the drill stationary relative to the seabed,
enabling the vessel to move up and down with the swell. These systems
allow drilling operations to be performed offshore and samples to be
recovered, and downhole CPT tests to be performed.
However, smaller seabed systems can be deployed from larger
types of vessels. In essence only a barge or vessel with a
suitable crane or Aframe is necessary. The selected vessel
must have the ability to remain on station throughout the test
either by anchoring or more commonly holding station using its
bow and stern thrusters. Figure 89 shows a typical portal frame
arrangement deploying a seabed resistivity system.
The methods of performing seabed investigations are detailed over the
following pages. These can vary from the simplest form of grab
sampling to new high quality sampling and CPT testing techniques.
The following marine site investigation tools will be described.
7/2/2015 InSitu Soil Testing | Offshore testing | Introduction
http://www.conepenetration.com/onlinebook/nearshoremarinetesting/introduction4/ 2/2
Seabed CPT systems
Seabed soil samplers
Seabed resistivity systems.
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