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Geotechnical Analysis of Foundations

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Questions and Answers

How are ships able to maintain their position with respect to known satellite positions in deep waters?

Dynamic global positioning systems (GPSs) with motors on the hull

What method is always used for offshore drilling?

Wet rotary drilling method

What is used to minimize the movement of the drilling tool in the z direction due to ship movement?

Heave compensators

Why is it difficult to recirculate the drilling mud in offshore work?

Injecting the drilling mud from the ship down the drill pipes and bringing it back to the ship is challenging. Signup and view all the answers

What is the main difference between offshore and onshore geotechnical investigations?

The difference lies in scale, complexity, and cost. Signup and view all the answers

How are offshore geotechnical samples obtained?

Through drop core sampling using a long, hollow tube from a limited height above the sea floor. Signup and view all the answers

Why is a casing necessary in offshore drilling?

To prevent collapse of the borehole due to soft offshore sediments near the sea floor. Signup and view all the answers

Why is access to the borehole necessary after drilling in offshore operations?

To take a sample or run an in situ test. Signup and view all the answers

Why is rotating casing-size drill pipe used in offshore drilling?

To prevent collapse of the borehole. Signup and view all the answers

What is the purpose of maintaining the ship's position in deep waters with respect to known satellite positions?

To facilitate drilling, sampling, and testing operations. Signup and view all the answers