The soil profile at a building site. Shaft foundations are to be used and design requirements dictate two alternatives. The first employs belled shafts with 6-ft diameter tips at 26-ft in depth. The second requires 2-ft diameter straight shafts to 42 ft in depth. Which alternative would you prefer to build? Justify your answer, giving the advantages and disadvantages of each alternative.

   

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Stiff clay 26 Dense medium sand 40 Limestone 50 FIGURE 10.27 Soil profile for problem 5. Depth, feet Stiff clay 26 Dense medium sand 40 Limestone 50 FIGURE 10.27 Soil profile for problem 5. Depth, feet