Pipe Soil Interaction
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Transcript of Pipe Soil Interaction
![Page 1: Pipe Soil Interaction](https://reader035.fdocuments.us/reader035/viewer/2022062420/55c92915bb61ebbf5e8b4727/html5/thumbnails/1.jpg)
SYNOPSIS
STIFFNESS CHARACTERISTICS OF BURIED AND ON-BOTTOM PIPELINES LOADED AXIALLY
Under the Guidance of
Mr. Adarsh K.R. Arya
Assistant Professor Senior Scale
Submitted by:
Mintu Choudhury
SAP ID: 500024885
M.Tech: Pipeline Engineering
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Problem• Some pipelines operate in high temperature and pressure
upto 150 C.
• It leads to expansion in the pipeline which causes a important phenomenon in the pipeline called Upheaval Buckling due to the accumulation of compressive stresses.
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Background• Buckling is a effect induced by a compressive force, which
distorts pipeline
• It is the same as buckling phenomenon in the column loaded axially
• There is uneven distribution of restrain provided by soil
• This occurs due to difficult conditions of laying pipeline in the seabed
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Soil Resistance
• The movement of buried or on-bottom pipeline is restricted by the soil
• The lateral movement is limited by the soil, which the pipeline tries to push (Fig 1 and 2)
• The axial movement is limited by the soil-pipeline friction (Fig 3)
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The selection of appropriate pipeline/soil response conditions is dependent on four factors:
Soil conditions
Pipeline roughness
Rate of pipeline movement
Degree of burial
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Procedure• Information to found out for different soil conditions
• Among the information:
Assume pipeline roughness Consolidation Coefficient of Soil Subsea Temperature Drained and Undrained Conditions for Partially Embedded and Buried Pipes Cohesive and Non-Cohesive Nature of Soil Governing Equations
• Interaction of the pipe material and the different soils will be compared by finding out the Fa (soil axial resistance)
• A chart will be plotted for axial resistance vs. different soil conditions to compare the results
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Governing Equations
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Motivation• The problem of UHB has become common now in
subsea pipelines in high pressure and temperature conditions
• Research has been carried out to reduce the temperature and pressure to avoid UHB
• But very less research has been carried out to solve the problem geotechnically
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Objectives• To study the behavior of the pipe in different soil
conditions
• Check out the soil behavior in both on-bottom pipes and partially embedded pipes
• To propose proper burial depth for subsea pipelines for different soil condition
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Thank You