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7 LATERAL ANALYSIS OF GROUPS OF DEEP FOUNDATIONS 7.1 INTRODUCTION The concepts related to the response of a single laterally loaded deep foundation element presented previously can be extended to a group of deep foundation elements. Groups can be analyzed using the p- y method or the strain wedge method discussed in Chapter 6. However, the lateral load resistance of a deep foundation element in a group is less than if the same foundation were an isolated element in the same subsurface conditions. Group efficiency and interaction must be accounted for in a group analysis. Most deep foundation groups involve foundations that are relatively closely spaced and therefore need to account for the interaction and reduction inefficiency within the group.
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