Grouted helical piers for use in foundation rehabilitation : centrifuge testing

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Title: Grouted helical piers for use in foundation rehabilitation : centrifuge testing
Authors: Bian, Yueying
Hutchinson, Tara C. (Tara Crystal)
Wilson, Dan
Laefer, Debra F.
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Date: Oct-2006
Abstract: Rehabilitation of building structures is a critical need facing numerous older urban areas. Many of these structures are supported on pile groups, which do not have adequate load capacity to support the demands expected after rehabilitation or superstructure replacement. Consequently, practical methods for strengthening existing foundations are of paramount concern. Recent studies have focused specifically on the use of grouted helical pier systems to strengthen pile group foundations, thereby substantiating their potential as a technique for load capacity enhancement (see companion paper by Laefer and Manke, 2006). However, these scaled studies were conducted at one-g level, resulting in soil confining stresses lower than those expected in the field. Thus, further verification through numerical modeling; full-scale experiments, or centrifuge testing is needed. This paper presents preliminary issues related to developing tools to support centrifuge testing of grouted helical pier systems. For this study, models for a 15-g centrifuge test were first explored at the one-g scale. With the small-scale model piers, a variety of grout types and pier installation methods were considered for the design and evaluation of the centrifuge tests. Based on the findings from this one-g testing, a preliminary centrifuge testing plan is presented.
Funding Details: Other funder
Type of material: Conference Publication
Publisher: BRE Press
Copyright (published version): IHS BRE Press , 2006
Keywords: Capacity enhancementCentrifuge modelsFoundation rehabilitationHelical pierModel testingUltra-fine cement grout
Subject LCSH: Foundations--Maintenance and repair
Language: en
Status of Item: Peer reviewed
Is part of: A. P. Butcher, J. J. M. Powell and H. D. Skinner (eds.). Reuse of foundations for urban sites : proceedings of the International Conference
Conference Details: Paper presented at the International Conference on Re-use of Foundations for Urban Sites (RuFUS). 19-20 October, 2006, Watford, U.K.
ISBN: 1860819397
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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