JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• 1. To understand the type of soil strata available in offshore.
• 2. To develop a structure under different environmental condition.
• 3. To design the anchors in the sea.

Course Outcomes

At the end of the course, student will be able to:

• 1. Understand the marine deposits and their behavior under different loading conditions
• 2. Design the shallow foundations and study the foundation stability of offshore structures.
• 3. Design the piles for offshore structures and submarine pipe lines

UNIT - I

The nature of Submarine Soils: origin, classification and distribution of marine sediments; in-situ 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. Design of suction piles for offshore structure.

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.

REFERENCE:

• 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)
• 3. Seabed Reconnaissance and Offshore Soil Mechanics (for the installation of petroleum structures) – Pierre LE Tirant (1979), Gulf Publishing Company, Houston, Texas.
• 4. API (2000) – Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms – API, RP2A. R19 M.TECH GEOTECHNICAL ENGG.
• 5. Pile design and construction practice – M J Tomlinson, View point Publications, Palladian Publications Limited (1987)
• 6. Port Engineering planning, construction, maintenance and security – George P Tsinker, John Wiley & Sons, Inc. (2004) R19 M.TECH GEOTECHNICAL ENGG. M.TECH.- I YEAR- II SEMESTER GEOTECHNICAL ENGINEERING