Abstract
The environment prevalent in ocean necessitates the piles supporting offshore structures to be designed against lateral cyclic loading initiated by wave action. Such quasi-static load reversal induces deterioration in the strength and stiffness of the soil-pile system introducing progressive reduction in the bearing capacity as well as the pile head displacement. To understand the effect of lateral cyclic load on lateral capacity of pile group in soft clay, a series of laboratory experiments were performed on model piles in soft cohesive soil. This paper presents the experimental observations made and the relevant conclusions drawn there from.
Highlights
Offshore structures, namely, oil drilling platforms, jetties, tension leg platforms etc. are mostly supported on pile foundations
In case of load controlled mode of cyclic loading, the amplitude has been normalized by ultimate static lateral pile capacity
Basack / Response of vertical pile group subjected to horizontal cyclic load in soft clay cracks
Summary
Oil drilling platforms, jetties, tension leg platforms etc. are mostly supported on pile foundations. As reported by other researchers, this type of loading induces progressive degradation of the foundation capacity associated with increased pile head displacement. The following are the reasons primarily responsible for such degradation of strength and stiffness of the pile-soil systems : (i) Development of excess pore water pressure generated during cyclic loading in progress. (ii) General accumulation of irrecoverable plastic deformation of soil surrounding the pile surface. (iii) Rearrangement and realignment of soil particles surrounding the pile surface. In former case, the load applied at the pile head varies cyclically with time such that the maximum and the minimum values remain constant for all cycles. It is the pile head deflection and not the applied load, which varies cyclically with time such that the maximum and the minimum values remain constant for all cycles
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