Theoretical Study on Optimum Depth of Ground Improvement for Laterally Loaded Piles Embedded in Clayey Deposit-Video

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The presentation examines the optimum depth of ground improvement needed to increase the lateral capacity of piles in soft clay. A theoretical pile-analysis method incorporating nonlinear soil behavior through P–Y curves was developed and validated against published results. The study found that ground improvement reduces pile deflection and increases pile-head stiffness, but benefits plateau beyond an optimum improvement depth. This optimum depends mainly on pile slenderness and head restraint: fixed-head piles generally require deeper improvement than free-head piles. Soil stiffness ratio has little effect on the effective improvement depth. The findings offer practical guidance for improving laterally loaded pile performance.

Keywords

ground improvement

lateral pile capacity

soft clay

P-Y curves

optimum improvement depth