Pile-Soil Interaction Properties

Pile-soil interaction properties allows for a connection between pile and soil. The soil interacts with piles (modelled by beam elements) through nodes along the piles in 3 dimensions . At the base of the pile, the interaction is through normal bearing contact. Along the piles, interaction is through shearing contact between piles and soil. The normal and shearing interaction stresses are given by

for vertical shear interaction along the piles and

for horizontal normal contact interaction along the piles

where:

• is the interaction stress (shear or normal as relevant),
• is the maximum value of the stress defined on this table,
• a coefficient obtained from Pile-soil interaction coefficients/curves explained in Pile-soil interaction coefficients table,
• is the relative displacement explained below
• , are geometry parameters explained below.

The values of represent the relative displacement between the pile and the elastic ground soil near it. That is, is the non-linear deformation of the soil local to the pile, which is usually behaving in a non-linear manner.

For circular piles the diameter of the pile

For rectangular piles, and are the side width of the rectangular section, and

For H & I sections, is the flange width, the web height + 2 × flange thickness, the complete perimeter (roughly 2 × web height + 4 × flange) and D .

Definition

Name

name of pile-soil interaction property.

Pile-Soil Interaction Curve (coefficients) in X, Y & Z or the curve used for pile base

These define the interaction curves used for x, y and z interaction and for the pile base interaction

The maximum soil bearing/shear stress-in X, Y, Z & pile base at both top and bottom of each layers of the soil.

These define maximum bearing/shear stresses in direction directions and locations