220241.01 - 70 Blanckensee Road, BLACK MOUNTAIN - SECONDARY DWELLING - Slope Stability Report · EXE23/0033

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The ultimate geotechnical end bearing and shaft adhesion parameters are presented in Table 2 for deep level
footings where high level footings are not suitable. 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.
TABLE 2: DEEP LEVEL FOOTING – ULTIMATE GEOTECHNICAL PARAMETERS (LONG PILE)

                  Material                          Bored               Bored            Screw               Screw

                                                   Fb (kPa)            Fs (kPa)         Fb (kPa)            Fs (kPa)
           Stiff or stronger clays                    675                30                450                  NR
 Notes: 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. Due
to installation disturbance, shaft adhesion should be ignored for steel screw piles. 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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