Centrifuge modelling of remediation of liquefaction-induced pipeline uplift using root systems

Ke Wang (Lead / Corresponding author), Andrew Brennan, Jonathan Knappett, Scott Robinson, Anthony Bengough

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Abstract

Buried pipelines are susceptible to floatation within liquefiable soil after earthquakes. When soil liquefies, its shear strength is significantly reduced due to generation of excess pore pressure. A buried pipeline within such soil can then uplift due to a combination of (i) an upwards pore pressure gradient across the pipe and (ii) the resisting force contributed from soil shear strength being significantly reduced. Roots have been confirmed to increase the shear resistance of soil, so they can potentially be used as a new countermeasure against pipeline uplift, in locations where there is no above-ground infrastructure (i.e. where uplift is most likely). Three centri-fuge tests have been conducted in this study to evaluate this potential. One was performed as a benchmark and the other two included one of two overlying model shallow root systems (either fibrous roots only, or fi-brous and large structural roots) respectively. The results show that roots can be used as a remediation method against pipeline uplift induced by soil liquefaction. Model fibrous roots were shown to reduce uplift displace-ments by 15% while the model system consisting of both large structural and fibrous roots further reduced up-lift to approximately 28%.
Original languageEnglish
Title of host publicationPhysical Modelling in Geotechnics
Subtitle of host publicationProceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom
EditorsAndrew McNamara, Sam Divall, Richard Goodey, Neil Taylor, Sarah Stallebrass, Jignasha Panchal
Place of PublicationLondon
PublisherCRC Press
Pages1265-1270
Number of pages6
Volume2
Edition1
ISBN (Electronic)9780429797620
ISBN (Print)9781138344228
DOIs
Publication statusPublished - 24 Oct 2018
Event9th International Conference on Physical Modelling in Geoetchnics - City University, London, United Kingdom
Duration: 17 Jul 201820 Jul 2018

Conference

Conference9th International Conference on Physical Modelling in Geoetchnics
CountryUnited Kingdom
CityLondon
Period17/07/1820/07/18

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    Wang, K., Brennan, A., Knappett, J., Robinson, S., & Bengough, A. (2018). Centrifuge modelling of remediation of liquefaction-induced pipeline uplift using root systems. In A. McNamara, S. Divall, R. Goodey, N. Taylor, S. Stallebrass, & J. Panchal (Eds.), Physical Modelling in Geotechnics: Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom (1 ed., Vol. 2, pp. 1265-1270). CRC Press. https://doi.org/10.1201/9780429438646