CUED Publications database

Soil deformation during monotonic and seismic pipe uplift in liquefiable soil

Chian, SC and Wang, D and Haigh, SK and Madabhushi, SPH (2015) Soil deformation during monotonic and seismic pipe uplift in liquefiable soil. Journal of Pipeline Engineering, 14. pp. 33-41. ISSN 1753-2116

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Abstract

UPLIFT OF PIPELINES can take place due to either thermal-upheaval buckling or floatation during earthquake-induced soil liquefaction. Despite similar global uplift failures being observed in both cases, the deformation of the soil surrounding the lifted pipe differs. The use of the particle- image-velocimetry (PIV) technique showed a wider spatial deformation mechanism occurring during the seismic uplift of the buoyant pipe in liquefied soil as compared to the localized soil movement from monotonic uplift of a pipe in full-scale and centrifuge tests. This is mainly due to the difference in soil conditions between the near- And far-field regions of the pipe. In the former case, the cyclic response of the pipe under horizontal earthquake shaking exerts external stresses onto the adjacent liquefied soil, thereby causing soil dilation to occur near the pipe.A large difference in soil stiffnesses between near- (less liquefied) and far-field (fully liquefied) regions is therefore developed which encourages the liquefied soil at the far field to fill the expanding void beneath the uplifted pipe.This is unlike the more-uniform stiffness of the soil in the drained condition in the latter case, which thereby induces displacement of the soil at the near field towards the invert of the pipe.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:43
Last Modified: 03 Aug 2017 03:13
DOI: