Base resistance of pile groups based on Ohde's approach

In order to study the effect of pile-soil-pile interaction on the mechanism of pile base resistance in pile groups,a calculating model is proposed for the ultimate tip bearing capacity of a pile group in cohesionless soil based on the Ohde's pattern derived from the compression mechanism for a single pile.From this model an approach is derived to evaluate respectively the ultimate base resistance of an individual outside pile or an individual inside pile in a pile group.In this theoretical procedure,the influence on the ultimate pile tip resistance is taken into account by the pile spacing,pile diameter,pile embedding length and the properties of the soil below the pile tip.The pattern given by the theoretical formula that the pile base bearing capacity increases with the relative pile spacing(the ratio of pile spacing to pile diameter)decrease agrees with that measured in a model test.