CUED Publications database

Remediation against floatation of underground structures

Chian, SC and Madabhushi, SPG (2013) Remediation against floatation of underground structures. Proceedings of the Institution of Civil Engineers: Ground Improvement, 166. pp. 155-167. ISSN 1755-0750

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Abstract

Underground structures located in liquefiable soil deposits are susceptible to floatation following an earthquake event due to their lower unit weight relative to the surrounding saturated soil. Centrifuge tests have been carried out to assess the effectiveness of existing remediation techniques in reducing the uplift of underground structures, namely in situ densification and the use of coarse sand backfill. The centrifuge test results showed that these methods do reduce the uplift displacement of buoyant structures. Their performance was thereafter linked to the theoretical mechanism of floatation of underground structures. Based on the understanding from preceding tests, a further improvement on the use of the coarse sand backfill was carried out, which produced a greater reduction in the uplift displacement of the structure. Each of these techniques, however, does pose issues when applied in the field, such as possible damage to surrounding structures, construction issues and maintenance problems.

Item Type: Article
Uncontrolled Keywords: Geotechnical engineering Models (physical) Seismic engineering
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:08
Last Modified: 08 Dec 2014 02:17
DOI: 10.1680/grim.11.00030