﻿ Sub-soil bearing capacity [RVS]

# Sub-soil bearing capacity [RVS]

Calculations of Sub-soil bearing capacity

The soil range of importance for the Sub-soil bearing capacity is from the pipeline axis to 1.5 diameter under the pipeline axis.

NEN3650-1992

For the NEN3650-1992 calculation methodology two formula's are given, one for sandy soil types and one for clayey/peaty soil types.

Sandy:

Clayey/peaty:

 Pwe Sub-soil bearing capacity γo (Mean) volume weight (averaged over range from pipeline axis to 1.5 diameter below pipeline axis) Nj D Outer diameter of pipeline Qn Neutral top soil load Nq dq Sq φo Angle of internal friction (averaged over range from pipeline axis to 1.5 diameter below pipeline axis) H* Height of soil coverage from ground level to pipeline axis cuo Undrained cohesion (averaged over range from pipeline axis to 1.5 diameter below pipeline axis) Sc dc

NEN3650-1:2017

Besides distinction in sandy soil types and clayey/peaty soil types, the NEN3650-1:2017 calculation methodology also distinguishes between slow and fast deformation for clay/peat soil types. The formula's for the NEN3650-1:2017 calculation methodology are:

Sandy:

Clayey/peaty, slow deformation:

Clayey/peaty, fast deformation:

 Pwe Sub-soil bearing capacity γav (Mean) volume weight (averaged over range from ground level to pipeline axis) Ny Sy D Outer diameter of pipeline qn Neutral top soil load Nq dq Sq φo (sand) Effective angle of internal friction (averaged over range from ground level to pipeline axis , using the Effective Young's modulus of soil for the same range with a depth as at bottom of pipe) φo (clay) Angle of internal friction (averaged over range from ground level to pipeline axis) H* Height of soil coverage from ground level to pipeline axis cuo Undrained cohesion (averaged over range from pipeline axis to 1.5 diameter below pipeline axis) c' Drained cohesion (averaged over range from pipeline axis to 1.5 diameter below pipeline axis) Sc dc

Last changed: 10/30/2019