JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objective

To understand differences between the soil and loading conditions of on-shore

and offshore structures, various types of offshore foundation systems, and to evaluate the performance of offshore structures.

Course Outcome

Students should be able to design and evaluate the performance of offshore

foundations.

UNIT - I

The nature of Submarine Soils: origin, classification and distribution of marine sediments; insitu stress state in submarine deposits; inorganic clay deposits; calcareous sediments; siliceous sediments. Offshore Geotechnical Investigations: phases of the investigation, geophysical survey, drilling and sampling procedures, in-situ testing techniques, laboratory testing.

UNIT - II

Foundations for Offshore Gravity Structures: construction, installation, instrumentation of gravity platforms, stability analysis, deformation analysis based on elastic theory, piping and erosion.

UNIT - III

Foundations for Jack-up Rigs: foundations types and design loads, Prediction of individual footing performance, prediction of mat footing performance, seabed anchors, load capacity of anchors, breakout forces, anchor systems for floating structures.

UNIT - IV

Offshore Pile Foundations: types of offshore piles, temporary support of piled structures, dynamic analysis of pile driving, axial load capacity, axial deformation analysis, Lateral loading, and dynamic response.

UNIT - V

Seafloor Stability: causes of seafloor instability, geological features of submarine slides, mechanisms of instability, slope stability under gravity forces and wave forces, Effects of soil instability on piles, installation, and stability of submarine pipelines.

TEXT BOOKS:

• 1. Marine Geotechnics – H. G. Poulos (1988), Prentice Hall Inc.
• 2. Construction of marine and offshore structures – Ben C Gerwick, jr., CRC Press, Taylor and Francis Group.(2012)

REFERENCES:

• 1. Seabed Reconnaissance and Offshore Soil Mechanics (for the installation of petroleum structures) – Pierre LE Tirant (1979), Gulf Publishing Company, Houston, Texas.
• 2. API (2000) – Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms – API, RP2A.
• 3. Pile design and construction practice – M J Tomlinson, View point Publications, Palladian Publications Limited.(1987)
• 4. Port Engineering planning, construction, maintenance and security – George P Tsinker, John Wiley & Sons, Inc. (2004) M. Tech – I Year – II Sem. (Geotechnical Engineering)