The Theory Of Pipe Soil Interaction

3776 Words Aug 28th, 2014 16 Pages
Theoretical Background

General

This chapter summarizes all the theoretical background that is necessary in order to understand the pipeline walking phenomenon. This includes the theory of pipe-soil interaction, the parameters of thermal expansion design as well as detailed definition of the pipeline walking, description of its mechanism and common mitigation methods.
The theoretical background behind pipeline walking phenomenon is quite vast as it includes aspects of structural, geotechnical and mechanical engineering. Therefore only a short description of each of the parameters and conditions that influence the phenomenon is presented and discussed.

Soil-Pipe Interaction The soil-pipe interaction represents the highest uncertainty when trying to assess the pipeline walking phenomenon as well as the general surface laid subsea pipeline behaviour. For this reason there is on-going research with experiments simulating the loading conditions and in-situ measurements to understand the geotechnical aspects of the soil.
In order to model the pipe-soil interaction effectively, to proceed to the pipeline walking analysis and assessment, a set of input parameters are need to be examined and well understood. These are the soil type classification, the thermal expansion mechanism and lastly the axial response of the pipeline under the examined loading/unloading conditions.

Soil Types and Classification
A seabed geotechnical survey is needed along the pipeline route in order…
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