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In order to study the bearing characteristics of Aeolian-sand composite foundation, including the influence and sensitivity of the foundation settlement and pile-soil stress ratio, this paper presents experimental and numerical studies of Aeolian-sand foundation treated with CFG piles (CFG single pile and composite foundation). The numerical results agree well with the in-situ load tests. Effect of pile spacing, cushion thickness & modulus, length of pile, pile diameter and tip soil parameters such as the Poisson’s ratio and soil modulus on both the composite foundation ultimate load bearing capacities and pile-soil stress ratio were analyzed. The results reveal that CFG pile has a critical length and the design equations by the code lie in the safe side. The pile spacing, cushion thickness and pile diameter affect the pile-soil stress ratio significantly. The thickness of cushion layer, the length of pile and the pile diameter also have significant effects on the compound foundation settlement. The CFG pile composite foundation can indeed enhance the load-bearing capacity of Aeolian-sand significantly.

Sensitivity Study of the Bearing Capacity and Pile-soil Stress Ratio for Aeolian Sand Foundation Treated with CFG Piles