EU LIMAS Liquefaction around marine structuresWorkpackage 7, NTNU Trondheim
Development of soil sampler for measurement of gas content in soils
Scope of work
By associate professors
Rolf Sandven (NTNU) and Mike Long (UCD)
EU LIMAS Liquefaction around marine structures
Workpackage 7, NTNU Trondheim
Development of soil sampler for measurement of gas content in soils
Scope of work
By associate professors
Rolf Sandven (NTNU) and Mike Long (UCD)
Overall objectives for further work with the new sampler for gassy soils Realistic ambitions
limited time
limited funding
Scope of LIMAS
bring new interest into sampling of gassy soils
contribute to further development of techniques
Development in steps
start with simple, but useful sampling and measuring method
gradual elimination of limitations as refinement is added to the equipment
EU LIMAS Liquefaction around marine structures
Problem
maintain natural level of saturation and gas content of soil sample during and after sampling
verify the gas content in obtained samples through direct or indirect measurements
minimise mechanical disturbance of soil sample during the sampling process Scope of work
develop soil sampler with pressurised sample cylinder
evaluate methods for detection of gas content in obtained samples
documentation of performance and working principles through laboratory and field studies
EU LIMAS Liquefaction around marine structures
Criteria for new soil sampler
should be able to cope with many types of sediments
simple system for control of pressure in sample cylinder
should primarily be applicable for depth range between 0 - 5 m under the seabed level
minimal soil disturbance and compaction by intrusion of the sampler body
Criteria for new soil sampler
the sampling equipment should be portable and possible to operate by different drilling units
limited maintenance required after sampling operations are completed
re-use of sealing device in subsequent sampling
EU LIMAS Liquefaction around marine structures
Plan of activities
start May 2001
duration 6 personmonths
Phase 1
literature survey with review of possible working principles for new sampler
literature review and evaluations of possible sealing techniques
literature review of various techniques for detection of gas bubbles and measurement of gas volume in soil samples
EU LIMAS Liquefaction around marine structures
Plan of activities
start December 2001
duration 12 personmonths
Phase 2
based on evaluations and findings made in Phase 1
presentation of ideas and suggestions to project partners
laboratory study of possible sample sealing techniques
step-wise development of new sampler for investigation of soil composition and real gas content
testing of prototype in controlled laboratory test conditions
EU LIMAS Liquefaction around marine structures
Plan of activities
start January 2003
duration 14 personmonths
Phase 3
modification of prototype after laboratory tests
in situ test program on suitable sites (partner project sites)
final modification of prototype with technical documentation, patenting and reporting from field and laboratory test studies
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