Calculation of Horizontal soil stiffness
The soil range of importance for the Horizontal soil stiffness is from the pipeline axis to 1.5 diameter under the pipeline axis, which is the same as for the Downward vertical soil stiffness.
NEN36501992
Using the NEN36501992 methodology, the Horizontal soil stiffness is determined using the following equation:
kh 
Horizontal soil stiffness 
kv 
NEN36501:2017
For the NEN36501:2017 methodology, the Horizontal soil stiffness is determined using the following equation:
kh 
Horizontal soil stiffness 
Qhor 

D 
Outer diameter of pipeline 
Last changed: 10/30/2019