Question
A drilled-shaft foundation having a sotal length of $12 \mathrm{~m}$ is constructed in an area underlain by clay soil having the following properties: From the ground surface to a depth of $7 \mathrm{~m}$, the soil cohesion is $45 \mathrm{kPz}$ and the unit weight is $16.5 \mathrm{kN} / \mathrm{m}^{\mathrm{s}}$; below $7 \mathrm{~m}$, the soil cohesion is 110 $\mathrm{kPa}$ and the unit weight is $19 \mathrm{kN} / \mathrm{m}^3$. This foundation unit will have a bellod (underreamed) boltoms; the shaft section has a $1 \mathrm{~m}$ diameter, and the base of the bottom section has a $2 \mathrm{~m}$ diameter. The bell forms a $60^{\circ}$ angle with the horizontal plane. Compute the design downward capacity using the empirical design nethod, Table 14.
Step 1
- Total length of the shaft, \( L = 12 \, \text{m} \). - Diameter of the shaft section, \( D_s = 1 \, \text{m} \). - Diameter of the base (bell), \( D_b = 2 \, \text{m} \). - Angle of the bell with the horizontal, \( \theta = 60^\circ \). Show more…
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