Abstract: The paper presents a series of ground improvement techniques used to minimize the potential large differential settlement for a crude oil tank farm station with complex subsurface conditions. Considering the fill materials at upper layer and weak soils at lower layer, the ground improvement involved the combination of low energy dynamic compaction and Cement Flyash Gravel (CFG) columns with various lengths through different soft soil. This paper presents the subsurface conditions encountered, construction controls, and testing performed to verify the effectiveness of the ground improvement.   

Key words: CFG Foundations, Single Column, Composite Ground, Bearing Capacity, Settlement