# Question 35.5: Find the allowable capacity of the belled caisson shown in F...

Find the allowable capacity of the belled caisson shown in Fig. 35.9. The diameter of the bottom of the bell is 4 m and the height of the bell is 2 m. The diameter of the shaft is 1.8 m and the height of the shaft is 10 m. The cohesion of the clay layer is 100 kN/m². The adhesion factor, α was found to be 0.55. Ignore the skin friction in the bell and one diameter of the shaft above the bell.

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Question: 35.9

## The following parameters are given. See Fig. 35.15. The caisson diameter is 4 ft. The compressive strength of steel is 36,000 psi. Er/Ec =0.5 where Er = elastic modulus of rock Ec = elastic modulus of concrete cohesion of the bedrock = 24,000 psf adhesion coefficient, α, for rock = 0.5 adhesion ...

STEP 1: Compute the ultimate end bearing capacity....
Question: 35.2

## This example explores a caisson design in multiple clay layers. Find the allowable capacity of a 1.5 m diameter caisson placed at 15 m below the surface. The top layer was found to be clay with a cohesion of 60 kPa and the bottom layer was found to have a cohesion of 75 kPa. The top clay layer has ...

STEP 1: Find the end bearing capacity. P_u ...
Question: 35.8

## Design a concrete caisson with a W-section (steel) at the core to carry a load of 1,000 tons. Assume the skin friction to be 150 psi and the end bearing to be 200 psi. See Fig. 35.13. The following parameters are given. The ultimate steel compressive strength is 36,000 psi,and the ultimate concrete ...

STEP 1: Structural design of the caisson. Assume a...
Question: 35.7

## Find the allowable capacity of the belled caisson shown in Fig. 35.11. The diameter of the bottom of the bell is 4 m and the height of the bell is 2 m. The diameter of the shaft is 1.8 m and the height of the shaft is 11.8 m. The cohesion of the clay layer is 100 kN/m². The adhesion factor,α, was ...

STEP 1: Find the ultimate caisson capacity, [latex...
Question: 35.6

## Find the allowable capacity of the shaft in the previous example, assuming a bell was not constructed. Assume the skin friction is mobilized over the full length of the shaft. See Fig. 35.10. ...

STEP 1: Find the ultimate end bearing capacity, [l...
Question: 35.4

## Find the skin friction of the 4 ft diameter caisson shown in Fig. 35.7 using the Meyerhoff equation. The average SPT (N) value along the shaft is 15 blows per foot. Ignore the skin friction in the fill material. ...

Only the skin friction is calculated in this examp...
Question: 35.3

## Find the tip resistance of the 4 ft diameter caisson shown in Fig. 35.6 using the modified Meyerhoff equation. The SPT (N) value at the caisson tip is 15 blows per foot. ...

STEP 1: Find the end bearing capacity. P_u=...