Example Problem 6.10 Figure 6.19 presents a plot of the lateral load kN versus lateral pile
head deflection (mm). The project specifications state that the maximum allowable lateral
movement of the pile is 10 mm (0.4 in.). It is also a requirement that a factor of safety of at
least 2 be applied to the ultimate lateral load capacity when determined from pile load tests.
Based on Fig. 6.19, determine the maximum allowable lateral load.
Solution From Fig. 6.19, at a pile head lateral deflection of 10 mm (0.4 in.), the corresponding lateral load is 30 kN (6.7 kips).
Also from Fig. 6.19, the ultimate lateral load capacity is 50 kN (11.2 kips). Applying a factor
of safety equal to 2, or