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:
Formula_RVS_sandy

Clayey/peaty:
Formula_RVS_clayey2

Pwe

Sub-soil bearing capacity

γo

(Mean) volume weight (averaged over range from pipeline axis to 1.5 diameter below pipeline axis)

Nj

Formula_Nj

D

Outer diameter of pipeline

Qn

Neutral top soil load

Nq

Formula_Nq

dq

Formula_dq

Sq

Formula_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

Formula_Sc

dc

Formula_dc

NEN3650-1:2012

Besides distinction in sandy soil types and clayey/peaty soil types, the NEN3650-1:2012 calculation methodology also distinguishes between slow and fast deformation for clay/peat soil types. The formula's for the NEN3650-1:2012 calculation methodology are:

Sandy:

Formula_RVS_sandy_newSy

Clayey/peaty, slow deformation:
Formula_RVS_clayey_slow_new

Clayey/peaty, fast deformation:
Formula_RVS_clayey_fast

Pwe

Sub-soil bearing capacity

γav

(Mean) volume weight (averaged over range from ground level to pipeline axis)

Ny

Formula_Ny

Sy

 

Formula_Sy

D

Outer diameter of pipeline

qn

Neutral top soil load

Nq

Formula_Nq

dq

Formula_dq

Sq

Formula_Sq_2012

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

Formula_Sc

dc

Formula_dc


Last changed: 07/07/2017