Answer Happy

2 (a) (i) Explain with the aid of a sketch and equations why some deep cuttings in stiff clay collapse during excavation whilst others in stiff clay survive and collapse after tens or hundreds of years. (5 marks) (ii) Explain with the aid of a sketch and equations why it may be possible to build a higher embankment over soft clay deposits when the embankment is raised (built up) slowly. (5 marks) (b) (i) Describe with the aid of a diagram the four aspects of geotechnics that must be considered in dealing with a ground engineering problem, and the associated activities. (4 marks) (ii) Explain how you would apply Burland’s ‘Secret of good ground engineering’ in the design and construction of a 10m deep excavation supported by struts at the site described in Question 1. Near the site there are buildings, some on shallow foundations. (6 marks)