CUED Publications database

Centrifuge modelling of inclined micro-piles for liquefaction remediation of existing buildings

Mitrani, H and Madabhushi, SPG (2008) Centrifuge modelling of inclined micro-piles for liquefaction remediation of existing buildings. Geomechanics and Geoengineering, 3. pp. 245-256. ISSN 1748-6025

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Abstract

This paper describes four centrifuge tests investigating the performance of non-structural inclined micro-piles as a liquefaction remediation method for existing buildings. Two soil profiles with the same superstructure founded on each were tested under earthquakes of different magnitudes and durations. The first profile consisted of a deep, homogeneous layer of loose, liquefiable sand. The second comprised a shallow layer of loose sand overlying dense sand. Centrifuge tests were carried out with and without inclined micro-piles in each soil profile. The superstructure was modelled as an idealised single degree of freedom (SDOF) system. It is found that the micro-piles have no detrimental effect on the performance of the structure during and after earthquakes. It is also possible that their presence may decrease structural settlements in earthquakes which cause liquefaction to a depth less than that of the improved zone. However, no conclusive evidence is obtained to show that the micro-piles significantly restrain lateral soil movement due to monotonic shearing from the structure or impede the migration of excess pore pressures from the free field to the foundation zone. Both these processes have critical effects on structural settlement. The use of inclined micro-piles for liquefaction remediation should therefore be considered with caution.

Item Type: Article
Uncontrolled Keywords: Centrifuge modelling Existing buildings Liquefaction remediation Micro-piles
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:31
Last Modified: 27 Nov 2014 19:20
DOI: 10.1080/17486020802483730