CUED Publications database

Cementation liquefaction remediation for existing buildings

Mitrani, H and Madabhushi, SPG (2010) Cementation liquefaction remediation for existing buildings. Proceedings of the Institution of Civil Engineers: Ground Improvement, 163. pp. 81-94. ISSN 1755-0750

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Abstract

Many typical liquefaction remediation techniques are not appropriate for application under existing buildings and more novel techniques are required. This paper describes centrifuge tests investigating the performance of cementation as a liquefaction remediation method. Two soil profiles with the same superstructure were tested under earthquake shaking. The first profile consisted of a deep layer of loose, liquefiable sand. The second comprised a shallow layer of loose sand overlying dense sand. Centrifuge tests were carried out with a cemented zone underneath the structure, through the full depth of the liquefiable layers and also partial depth. The superstructure was modelled as a single-degree-offreedom system. It is found that a cemented zone through the full depth of a liquefiable layer results in considerable reduction of structural settlements. Increased magnitude and higher frequency accelerations are transmitted to the structure but, depending on the building characteristics, it is likely that improved overall seismic performance can be achieved. Improvements in structural settlements can also be obtained with partialdepth remediation, if the depth of the cemented zone is greater than the depth of liquefaction. This type of remediation seems to have little effect on the accelerations transmitted to the structure.

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 11:31
Last Modified: 08 Dec 2014 02:28
DOI: 10.1680/grim.2010.163.2.81