Attachment B - Geotechnical Investigation Report AG-220544-RPT-G-01_[Rev A]

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The ultimate geotechnical end bearing and shaft adhesion parameters are presented in Table 2. The values given
will need to reduced by applying a suitable geotechnical strength reduction factor (Φg) for limit state or divided by a
suitable factor of safety for working stress methods. The Φg should be selected by the designer.
Based on the conditions encountered, bored piles would be considered suitable.


TABLE 2: DEEP LEVEL FOOTING – ULTIMATE GEOTECHNICAL PARAMETERS (LONG PILE)

                  Material                                     Bored                                    Bored

                                                             Fb (kPa)                                 Fs (kPa)
                   Stiff clay                                     -                                        -
            Very low strength rock                              1800                                      60
 Notes: Ɣ = Unit Weight (moist); Fb = Base Bearing (Ultimate); Fs = Shaft Adhesion (Ultimate)


The upper 1 m of soil profile should be ignored in shaft calculations for bored piles to allow for shrinkage cracks.
The values presented in Table 2 assume that the material equal to four pile diameters below the base of any
footings is as strong or stronger.
Settlement values are subjected to a variety of factors; however, a properly designed and constructed pile should
have a serviceability settlement between 1% and 2% of its’ diameter.




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