Odkaz jsme Vám odeslali na email.

Nepodařilo se nám odeslat odkaz na váš email. Zkontrolujte, prosím, Váš email.

Online nápověda



Angle of Dilation

The angle of dilation controls an amount of plastic volumetric strain developed during plastic shearing and is assumed constant during plastic yielding. The value of ψ = 0 corresponds to the volume preserving deformation while in shear.

Clays (regardless of overconsolidated layers) are characterized by a very low amount of dilation (ψ ≈ 0). As for sands, the angle of dilation depends on the angle of internal friction. For non-cohesive soils (sand, gravel) with the angle of internal friction φ > 30° the value of dilation angle can be estimated as ψ = φ - 30°. A negative value of dilation angle is acceptable only for rather loose sands. In most cases, however, the assumption of ψ = 0 can be adopted.