Experimental investigation of grouted helical piers for use in foundation rehabilitation

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Title: Experimental investigation of grouted helical piers for use in foundation rehabilitation
Authors: Bian, Yueying
Hutchinson, Tara C. (Tara Crystal)
Wilson, Dan
Laefer, Debra F.
Brandenberg, Scott
Permanent link: http://hdl.handle.net/10197/2166
Date: Sep-2008
Abstract: Building rehabilitation is critical for numerous older urban areas, many of which have inadequate foundations to support new demands. Consequently, development of practical methods to strengthen existing foundations is crucial. In engineering practice, both subsurface grouting and helical piers have been widely used to address these issues by strengthening the foundation. If the solid shaft of a typical helical pier is replaced by a hollow shaft, then helical piers provide the ability to deliver grout. It is hypothesized that these grouted helical pier systems (GHPS) could address foundation strengthening needs. This paper presents findings from an exploratory research program where grouting and pier placement tools were developed and tested on the large geotechnical centrifuge at the University of California, Davis. Experimental methods and procedures developed are presented, and observations regarding the formation of grout bulbs under different conditions are analyzed. Physical observation of the test specimens indicates that average grout bulb diameters of 0.6-1.9 times the helix diameter (Dh) are attainable. For similar grout mixes, 20-50% larger grout bulbs can be attained by adding just a modest amount of injection pressure. Future research may use these results to develop load performance data.
Funding Details: Not applicable
Type of material: Journal Article
Publisher: American Society of Civil Engineering (ASCE)
Copyright (published version): 2008 ASCE
Keywords: Grouting;Piers;Centrifuge models;Rehabilitation;Deep foundations
Subject LCSH: Grouting
Piers
Foundations--Maintenance and repair
DOI: 10.1061/(ASCE)1090-0241(2008)134:9(1280)
Language: en
Status of Item: Peer reviewed
Appears in Collections:Urban Institute Ireland Research Collection
Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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