ABSTRACT
The maximum value of the negative friction obtained from Eqs. (15.84) or (15.85) should be used for the design of pile groups.
Example 15.28 A square pile group similar to the one shown in Fig. 15.27 passes through a recently constructed fill. The depth of fill L
n = 3 m. The diameter of the pile is 30 cm and the piles are spaced 90 cm
center to center. If the soil is cohesive with qu = 60 kN/m2, and y= 15 kN/m3, compute the negative frictional load on the pile group.
