# PLE forum

Full Version: Soil settlement and pipeline displacement
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Dear Mr./Mrs.
I am now calculating the maximum settlement value for specific pipes. The assumption is simple, a straight pipe with infinite open model boundary, in the middle of the pipe, there is a double shape settlement loading. The aim is to find the maximum tolerant value.
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Background
According to paragraph 4.5 in the “theoretical manual” published in 1989 march, version 3.02, the resulting soil reaction will be where
- K represents the soil stiffness
- ∆S is the movement of the soil, input SUBZMAX in function 4.2
- ∆P is the distance with which the pipeline move together with the soil movement, output U-Z in function 5
And there will be two cases,
- the pipe follows the soil settlement completely, ∆P=∆S, then U-Z=SUBZMAX
- the pipe is rigid, ∆P<∆S, then U-Z<SUBZMAX
Example
Pipe: DN800 water pipe with a wall thickness 9.52mm