During a soil exploration program, the following choices were available for soil sampling:
• Shelby tube A: outside diameter, Do = 76.2 mm; inside diameter, Di = 73 mm
• Shelby tube B: outside diameter, Do = 88.9 mm; inside diameter, Di = 85.72 mm
• Split spoon sampler: outside diameter, Do = 50.8 mm; inside diameter,
Di = 35 mm
Calculate the area ratio for each case and determine which sampler would be appropriate for the following soil characterization tests: grain-size distribution, Atterberg limits, consolidation, and unconfined compression.