Abstract
Buried pipelines subjected to permanent ground deformations (through, e.g., earthquake-induced liquefaction or fault rupture) often experience widespread damage. Regardless of the direction of ground movement, pipelines tend to respond and experience damage axially due to their directional stiffness characteristics. In addition, case studies and previous testing have shown that damage is concentrated at the pipe joints due to their lower strength compared with a pipe barrel. Previous testing has also shown that axial forces increase significantly when pipe connections have jointing mechanisms, such as coupling restraints, with larger diameters than the pipe barrel alone. These enlarged joints act as anchors along the pipe, increasing the soil resistance at these locations. Current methods for predicting the axial force along a pipe underpredict the force demands and oversimplify the mechanics of soil resistance on the joint face. This study conducts a series of 12 pipe-pull tests in a centrifuge, varying joint diameter and burial depth, to quantify the axial forces developed. A strong linear correlation was observed between the soil resistance on a joint face and the joint surface area and burial depth. The study also proposes an analytical solution based on pullout capacity design equations for vertical anchor plates as a function of soil and pipe joint properties. The proposed solution to calculate joint resistance is in good agreement with the centrifuge tests performed for this study and previous full- and model-scale experiments. The proposed prediction equation is anticipated to have future applications to other buried structures because it is based on mechanisms of passive resistance commonly encountered in underground structures and lifelines.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available on DesignSafe at https://doi.org/10.17603/ds2-hgvq-6m15, reference number PRJ-4191, or upon reasonable request of the corresponding author.
Acknowledgments
The authors thank the Center for Infrastructure, Energy, and Space Testing (CIEST) at the University of Colorado and their staff for the use of the -ton centrifuge facility and expert technical assistance. Support for the first author was provided by the United States Department of Education’s Graduate Assistance in Areas of National Need program (Award No. P200A180024). Any expressed opinions, findings, conclusions, or recommendations are those of the authors and do not necessarily reflect the views of the Department of Education.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 150 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jun 13, 2023
Accepted: Nov 27, 2023
Published online: Jul 2, 2024
Published in print: Sep 1, 2024
Discussion open until: Dec 2, 2024
ASCE Technical Topics:
- Axial forces
- Buried pipes
- Continuum mechanics
- Design (by type)
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Forces (type)
- Geomechanics
- Geotechnical engineering
- Infrastructure
- Joints
- Load and resistance factor design
- Load factors
- Pipe joints
- Pipeline systems
- Pipes
- Soil dynamics
- Soil mechanics
- Soil-pipe interaction
- Soil-structure interaction
- Solid mechanics
- Structural design
- Structural engineering
- Structural members
- Structural systems
- Structures (by type)
- Underground structures
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