Compute Q_{u} \text { and } Q_{a} for the pier given in Ex. 17.5 by the following methods.
1 . Use the SPT value [Eq. ( 1 5 .48) j for bored piles
Q_{u}=133 N_{c o r} A_{b}+0.67 \vec{N}_{c o r} A_{s} (15.48)
2. Use the Tomlinson method of estimating Q_{b} and Table 15.2 for estimating Q_{f}. Compare the results of the various methods.
Table 15.2 Values of \overline{ K }_{s} \text { and } \delta(Broms, 1966) | |||
Values of \bar{K}_{s} | |||
Pile material | \delta | Low D_{r} | High D_{r} |
Steel | 20° | 0.5 | 1 |
Concrete | 3 / 4 \phi | 1 | 2 |
Wood | 2 / 3 \phi | 1.5 | 4 |