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.
Using the NEN36501992 methodology, the Horizontal soil stiffness is determined using the following equation:

For the NEN36501:2020 methodology, the Horizontal soil stiffness is determined using the following equation:

Last changed: 7/1/2021