Design Guidelines for Increasing the Lateral Resistance of Highway-Bridge Pile Foundations by Improving Weak Soils

2011 ◽  
Author(s):  
Dan Brown ◽  
Kyle Rollins ◽  
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Keyword(s):  
Design Guidelines ◽  
Pile Foundations ◽  
Highway Bridge ◽  
Weak Soils ◽  
Lateral Resistance

A Comparative Study Between Lateral and Upward Anchor-Soil and Pipe-Soil Interaction in Dense Sand

2016 ◽  
Author(s):  
Kshama Roy ◽  
Bipul Hawlader ◽  
Shawn Kenny ◽  
Ian Moore
Keyword(s):  
Shear Bands ◽  
Experimental Studies ◽  
Confining Pressure ◽  
Design Guidelines ◽  
Vertical Strip ◽  
Dense Sand ◽  
Progressive Development ◽  
Lateral Resistance ◽  
Strain Behaviour ◽  
Uplift Forces

Buried pipelines are extensively used in onshore and offshore environments for transportation of hydrocarbons. On the other hand, buried anchors have been used for many years to stabilize various structures. In the development of design guidelines for pipelines, theoretical and experimental studies on buried anchors are sometimes used assuming that pipeline-soil and anchor-soil interaction are similar. In the present study, finite element (FE) modeling is performed to simulate the response of pipeline and anchor buried in dense sand subjected to lateral and uplift forces. The similarities and differences between the responses of these two types of structures are examined to justify the application of anchor theory to pipeline behaviour. The stress-strain behaviour of dense sand is modeled using a Modified Mohr-Coulomb (MMC) model, which considers the pre-peak hardening, post-peak softening, density and confining pressure dependent friction and dilation angles. A considerable difference is found between the lateral resistance of pipeline and vertical strip anchor of similar size. Progressive development of shear bands (shear strain concentrated zone) can explain the load-displacement behaviour for both lateral and upward loading.

Global Buckling Mitigation of Buried Pipelines: Lateral Resistance Assessment

2015 ◽  
Author(s):  
Martin Gallegillo ◽  
Guillaume Hardouin
Keyword(s):  
Design Guidelines ◽  
Buried Pipelines ◽  
Lateral Buckling ◽  
Element Analysis ◽  
Upheaval Buckling ◽  
Lateral Resistance ◽  
Rock Cover ◽  
Global Buckling ◽  
Cover Design ◽  
Analytical Tools

This paper presents an approach to rock cover design for un-trenched pipelines installed on the seabed and rock-dumped for protection against dropped objects, anchor chain impact and fishing/trawling activities. This is found in some North Sea locations which present challenging conditions for trenching while protection is necessary due to intensive fishing activities. Under these circumstances the pipeline must remain within the rock berm and, hence, it must be designed against global buckling. Whereas there are clear design guidelines addressing upheaval buckling behaviour, the resistance to lateral buckling to maintain a pipeline within the rock berm has received less attention in the literature. The aim of this paper is to present a method to design a rock berm to mitigate against lateral buckling of rock-dumped pipelines based on the horizontal out-of-straightness survey data provided to the designer. The main challenges associated with this activity at different design phases are also introduced, including the use of analytical tools as well as detailed finite element analysis.

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