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314 ANALYSIS AND DESIGN OF PILE GROUPS
Figure 10.13 Comparison of load-settlement response for single pile.
Figure 10.14 Comparison of load-settlement response for 5-pile group.
The group piles were connected by a massive reinforced concrete cap and
arranged in a 2×3 configuration with centre-to-centre spacing of three pile
diameters, as shown in the inset to Figure 10.16. The lateral load was applied at
the level of the ground surface for both the single pile and the pile group. The
soil was generally classified as silty sand or silt with occasional layers of silty
clay. The water table is at approximately 1 m below the ground surface.
The soil parameters adopted for the PGROUPN analysis include a profile of
the initial soil modulus of 77 MPa at a depth of 1 m (where the bottom of the pile
