Numerical modelling of swelling/shrinkage behaviour of unsaturated soils for buried pipe stress analysis

2015 ◽  
pp. 615-620 ◽  
Author(s):  
D Weerasinghe ◽  
J Kodikara ◽  
H Bui
Keyword(s):  
Numerical Modelling ◽  
Stress Analysis ◽  
Unsaturated Soils ◽  
Buried Pipe ◽  
Shrinkage Behaviour

scholarly journals A thermo-hydro-mechanical constitutive model and its numerical modelling for unsaturated soils

2004 ◽  
Vol 31 (2) ◽  
pp. 155-167 ◽  
Author(s):  
Wenhua Wu ◽  
Xikui Li ◽  
R. Charlier ◽  
F. Collin
Keyword(s):  
Numerical Modelling ◽  
Constitutive Model ◽  
Unsaturated Soils

An Experimental Testing of Fillet Welded Specimens

2015 ◽  
Vol 752-753 ◽  
pp. 412-417 ◽  
Author(s):  
Martin Krejsa ◽  
Jiri Brozovsky ◽  
David Mikolasek ◽  
Premysl Parenica ◽  
Libor Zidek ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Stress Analysis ◽  
Numerical Models ◽  
Experimental Testing ◽  
Fem Analysis ◽  
Experimental Tests ◽  
Strength Characteristics ◽  
Fillet Welds ◽  
Commercial Software

The paper describes the experimental tests of steel bearing elements, which were aimed at obtaining material, geometric and strength characteristics of the fillet welds. Preparation of experiment consisted in defining of numerical models of tested samples using FEM analysis and the commercial software ANSYS. Data obtained from described experimental tests are necessary for further numerical modelling of stress analysis of steel structural supporting elements.

Analyzing Effects of Soil Parameters on Buried Pipe Behavior and Deciding Governing Parameter Using Statistical Approach

2015 ◽  
Author(s):  
Gaurav P. Bhende ◽  
Pallavi B. Kulkarni ◽  
Priyanka M. Kale
Keyword(s):  
Stress Analysis ◽  
Friction Angle ◽  
Soil Survey ◽  
Soil Parameters ◽  
Buried Pipe ◽  
Governing Parameter ◽  
Active Length ◽  
Soil Parameter ◽  
Future Design ◽  
Analysis Methods

One of the most common and practical difficulties a pipeline engineer faces at the initial stage of the project is the lack of Soil survey data. Hence, various soil parameters like soil type, density, friction angle, cohesive pressure, depth of cover, pipe coating etc. are needed to be assumed. The critical designs like anchor block requirement, pipe route changes, support loads which involve a huge cost are required to be ‘Issued for Construction’ based on assumed data. This paper briefly illustrates and compares the results obtained from the two most common buried pipe stress analysis methods viz. ‘American Lifeline Alliance - Appendix B’ (1) and ‘Stress Analysis Methods for Underground Pipelines’ (2) and shows their effects graphically on the various Stress Analysis results like pipe movement, end force, active length (virtual anchor length) and bending stress generated in the buried pipeline. Further, this paper comes up with an unique application of ANOVA, a Statistical method, to find out the most significant soil parameter affecting the said results. The paper explains this method with a solved example. These results are useful for a pipeline engineer to determine the governing soil parameter in the design and thus provide a useful tool to make optimum assumptions in absence of soil data so as to minimize the changes in future design and helps saving the cost of the project due to rework.

Numerical investigation of soil–pipeline system behavior nearby unsupported excavation in saturated and unsaturated glacial till

2019 ◽  
Vol 56 (1) ◽  
pp. 69-88 ◽  
Author(s):  
Mohammed Al-Khazaali ◽  
Sai K. Vanapalli ◽  
Won Taek Oh
Keyword(s):  
Stress Analysis ◽  
Effective Stress ◽  
Unsaturated Soils ◽  
Economic Losses ◽  
Internal Stresses ◽  
Pipeline System ◽  
Buried Pipeline ◽  
Pipeline Systems ◽  
Effective Stress Analysis ◽  
Internal Forces

Buried pipeline systems form vital infrastructure, all over the world, to transport resources such as water, oil, and gas from the production stage to the locations of consumption. Failure or rupture in pipelines in general and oil or gas pipelines in particular lead to not only economic losses that are expensive, but also cause extensive damage to the environment in several scenarios. One of the key reasons for buried pipeline systems failure is associated with excavation or soil trenching within the proximity of pipelines. Soil deformation associated with excavation causes relative displacement between the pipeline and the surrounding soil, which contributes to external as well as internal stresses and strains on the pipelines. In this study, numerical analyses are carried out to investigate the behaviors of buried rigid and flexible pipelines by extending the effective stress analysis and the modified effective stress analysis approaches for saturated and unsaturated soils, respectively. The pipe displacement, strains, and internal force results from the study suggest that soil trenching in unsaturated soils contribute to limited deformations within the proximity of the embedded pipelines and result in lower internal forces. The proposed methodology can be used to determine the safe depths of unsupported excavations in unsaturated soils without causing excessive strains or internal forces in the ring of rigid and flexible pipes.

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