Geotechnical Earthquake and Offshore

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Geotechnical Earthquake and Offshore Engineering
Coursework submission 2 (50% of module marks)
Submission deadline: May 14th, 2021 by 16:00 (UK time)
1. A mass gravity wall with the geometry shown in Fig. Q1 is retaining a soil
of γ = 20 kN/m3, φ’ = 35o and a slope 10o. Using the Mononobe-Okabe
method, determine the PA, PAE, ΔPAE and overturning moment at the base.
Fig. Q1. Gravity retaining wall
(8 marks)
2. a) Assuming kh = 0.1 and kv = 0.0, compute the pseudo-static factor of
safety for a slope with height H = 10 m and slope gradient 2:1 (H:V). The
slope faces to the left (i.e. highest part of the slope is on the right). For
conceptual design purposes, assume a slip circle with centre located 21 m
above and 18 m to the right from the toe of the slope, respectively. Soil
properties are cu = 100 kPa and  = 18 kN/m3
(8 marks)
b) Comment on whether this is likely to be most critical slip circle and what
would you do to estimate the most critical factor of safety.
(3 marks)
c) How would your results be affected by kv  0?
(3 marks)
d) Comment on the likely characteristics of the ground motion
representing kh = 0.1
(3 marks)
3. Provide evidence and calculations for an offshore pile able to resist a
vertical load of 8 MN. Your design should be based on the ICP method and
assume a 30 m water depth to the soil profile characterised by the CPT results
and additional information provided in Moodle. As part of your design you
must explicitly state the relationships between CPT data and soil properties
which you may use, as well as the rational for the choice. Design parameters,
values and any other assumptions required must be also properly justified
and/or explained. You must also demonstrate consideration of
installation/construction process as part of your design.
(25 marks)
Total marks [50]

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