Top soil load [SOILNB]:

Neutral or real top soil load [SOILNB]

Prescribed name

[Default: Neutral top soil load]

(The neutral or real top soil load [SOILNB] can be filled with either 1)neutral or 2)real calculated top soil load values.
For more information check Calculation of Neutral/Real top soil load [SOILNB].)

Installation method (NEN3650-1:2020 calculation methodology only):

Installation method of pipeline

Prescribed name

[Default: Trench uncompressed fill]

(The installation method can be set to 1)Trench uncompressed fill, 2)Trench compressed fill, 3)Boring and 4)HDD (Horizontal Directional Drilling).
The installation method is used in calculation of the Downward vertical soil stiffness [KLS], Horizontal bearing capacity [RH], Passive soil reaction [RVT], Pipe-soil friction [F] and the displacement at maximum soil friction [UF]. The choice between compressed and uncompressed trench fill decides whether the normal or compressed shrinkage percentage is used.)

Info In sections where a Horizontal Directional Drilling (HDD) installation method is defined, the pipe-soil friction (F) is set to zero and the displacement at maximum soil friction (UF) is set to 8 mm as if the bentonite is weak clay.

Info In sections where a non-trenching installation method (boring or HDD) is defined, the upward vertical soil stiffness (KLT) is made equal to the downward vertical soil stiffness (KLS).

Deformation speed (NEN3650-1:2020 calculation methodology only):

Deformation speed of soil

Prescribed name

[Default: Slow deformation]

(The deformation speed can be set to 1)Slow deformation or 2)Fast deformation.
The deformation speed differentiates clayey/peaty soil into drained or undrained for respectively slow or fast deformation. This effects the calculation of the Horizontal bearing capacity [RH] and Sub-soil bearing capacity [RVS].)

Last changed: 6/9/2021