Coefficient of Influence of Pile Widened Base BETA
This coefficient denoted as β represents the influence of an expanded pile base, its values are evident from the following figure:
(as a function 
of 
):
Graph to determine the coefficient β
where: | H | - | pile length [m] |
Deq | - | equivalent pile diameter at pile base [m] | |
deq | - | equivalent pile shank diameter [m] |
For the NBN EN 1997-1 ABN standard, the coefficient β is interpolated according to the following chart:
where: | Db,eq | - | |
Ds | - | shaft pile diameter [m] |