Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312294
Title: The development of laboratory measurement techniques to study liquefaction mitigation by vibro-replacement stone columns
Author: Blewett, Jo
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2000
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Abstract:
Existing and novel laboratory techniques and equipment are used to produce comprehensive information on the liquefaction mitigation provided by granular drainage columnar inclusions in loose sand. Extensive use is made of bender-element testing techniques and the frequency dependence of such measurements is examined. Phase-sensitive detection is proposed as a new method to obtain the frequency response of the element data. The applicability of this technique is extended to provide a convenient and accurate method for determination of the time-of-flight of a shear-wave in sand. This technique is employed to measure the load share between sand and columnar components during triaxial testing. A novel low cost, high loading frequency, triaxial testing system is developed and preliminary testing is carried out on both pure sand samples and composite columnar samples. The testing programme examines aspects of liquefaction mitigation due to the rigidity of the columnar inclusions and due to the increased permeability of the columns. The laboratory results are verified by the application of existing analytical models. The equipment and techniques are used to investigate the feasibility of using recycled aggregates in place of stone backfill.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.312294  DOI: Not available
Keywords: LIQUEFACTION; MITIGATION; CONCRETES; SOIL MECHANICS; EARTHQUAKES; BUILDINGS; BRIDGES; MEASURING METHODS; DESIGN Ships Offshore structures Solid state physics Structural engineering
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