What is it about?
This research studies the soil demand acting along an axially loaded pipeline with enlarged joints. 3 burial depths and 4 joint diameters were varied resulting in 12 unique test combinations. The physical test results were used to verify an analytical solution that treats the enlarged joints as vertical anchors. The resulting analytical equation solves for passive pressures acting on the joint face in terms of soil properties and pipeline characteristics.
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Why is it important?
Previous testing has shown that enlarged jointing components require significantly more pull force to displace a pipe axially through a soil mass compared to a straight pipe segment. This test varies the size of the joint face being pulled through a soil mass at three burial depths. This research is important because the force-displacement relationships for these tests can be used by designers and researchers to help understand the magnitude of forces their system will experience during a ground movement event. Further, this research has been used to develop a flowchart that calculates total soil loading along a system of multiple pipe segments.
Perspectives
This research is being used to develop ongoing Manuals of Practice for the seismic design of water and wastewater pipelines and has been the basis for additional journal publications. This work provides a "first step" to understanding how to quantity demand loading along buried pipeline systems.
Dr. Hailey-Rae Rose
Exponent Inc
Read the Original
This page is a summary of: Axial Resistance of Pipelines with Enlarged Joints, Journal of Geotechnical and Geoenvironmental Engineering, September 2024, American Society of Civil Engineers (ASCE),
DOI: 10.1061/jggefk.gteng-12017.
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