Experimental Study on Uplift Mechanisms of Pipes Buried in Sloping Medium Dense Sand
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 12, Issue 3
Abstract
Experiments are conducted to study the uplift behavior of buried pipes in medium dense sand with ground slopings of 0°, 10°, 20°, and varying burial depths. Test results show that the peak uplift resistance reduces with the increasing sloping, and up to 10% reduction is observed for 20° sloping. The displacement of pipe where the peak is mobilized, , also reduces for 20° sloping. The uplift resistance experiences a quicker reduction after reaching the peak due to the ground sloping. The stress level increases on the uphill side and decreases on the downhill side, resulting in lower and higher dilatancy, respectively. Consequently, the angle of slip plane to the vertical direction become smaller on the uphill side and larger on the downhill side. The slip plane extends to the ground and a complete slip mechanism develops at a pipe displacement of . The postpeak softening behavior of uplift resistance oscillates at an amplitude increasing with the burial depth and decreasing with the sloping, due to the arching effect as soil moving around the pipe periphery.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The work presented in this article was supported by the National Natural Science Foundation of China (Grant Nos. 51988101 and 51178427), the Natural Science Foundation of Zhejiang Province (Grant No. LCZ19E080002), the Fundamental Research Funds for the Central Universities (Grant No. 2019FZA4016).
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 12 • Issue 3 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 14, 2020
Accepted: Feb 22, 2021
Published online: May 12, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 12, 2021
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