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Bearing capacity of Piles in group By: Alka Shah Assistant professor Civil Department Nirma University
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Plie Group
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Generally Qug ≠ n Qu Qug = ultimate load capacity of pile group n = number of piles in group
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But soil between the individual piles may become locked due to densification from driving and group may tend to behave as an equivalent single large pile These tend to increase the group capacity to be greater then the sum of capacities of the individual piles
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Ultimate load carrying capacity of pile group is select as smaller of the two values determined from below two criteria: 1.Qug = n Qu 2.Qug = pile group as a equivalent single large pile (consider as a block) Efficiency of pile group = g = Qug/n Qu Ultimate Load Carrying Capacity of Pile Group
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Spacing of Piles 2.5 B to 3.5 B is preferable
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Negative Skin Friction
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Pile Group Settlement In group of pile all pile set equally due to rigidity of pile cap But settlement of group is more then the single pile due to stress zone Pile group in clay fail due to settlement then the bearing pressure Settlement of pile group is determine by assuming the entire pile group as an equivalent raft located at depth 2/3 D Load distribution diagram is also shown Width of raft = {B + 2 (1/4) * (2/3 D)}
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