a) Discuss the criteria on the selection of dynamic compaction and vibro-techniques for ground improvement on the aspects of the soil type, compaction depth, environment, and surrounding impact. (15 marks) b) Assess the suitability of ONE backfill soil selected from the supplied soils (Soil types E to H) for a vibro-flotation project. The results distribution for these soils are given in Figure 4. of particle size (10 marks) Percentage smaller 100 90- 80 70 60 50 40 30 20 10 0 CLAY T 0.001 BS Sieves H -63 m SILT FINE MEDIUM COARSE 0.01 m 212 m 600 E 2 mm SAND FINE MEDIUM COARSE FINE T 0.1 1 Particle size (mm) -6.3 mm 20 mm 63 mm GRAVEL MEDIUM COARSE 10 COBBLES 100