Calculations of Upward vertical soil stiffness
The Upward vertical soil stiffness is only calculated for the NEN3650-1:2020 calculation methodology. The soil range of importance for the Upward vertical soil stiffness is from ground level to the top of the pipeline. There are two formulae for trench installation: one for sandy soil types and one for clayey/peaty soil types and there is one formula for non-trench installation. A trench installation is either 1)Trench uncompressed fill or 2)Trench compressed fill and a non-trench installation is either 3)Boring or 4)HDD.
The formula for kv,top has been adapted for the calculation model used in Ple4Win, also see the comment on page 144, NEN3650-1:2020, C.4.3.2.
Last changed: 7/2/2021