Field Investigation into Effectiveness of Compaction Grouting
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 138, Issue 4
Abstract
The common design approach of compaction grouting for ground improvement works is oversimplified and does not account for the effects of soil properties and grouting variables. The obtained improvements therefore appear inconsistent with the predicted ones. This paper presents the results of a field test conducted at Tokyo International Airport to evaluate the effectiveness of compaction grouting under well-controlled conditions. The test consisted of 87 compaction grout piles injected in three cases of different pile diameters and spacings. The paper also discusses the effects of soil properties, replacement ratio, and injection sequence on the effectiveness that is evaluated in terms of the standard penetration test -value and cone penetration test tip resistance, and the variation of effectiveness with depth. A new design procedure that accounts for the effects of initial soil properties is introduced. It has been found that the injection sequence has a significant effect on the grouting mechanisms and effectiveness; this effect is discussed for both high and low compressibility soils. Significant observations are also made on relatively shallow treatments, the associated ground surface heave, and the corresponding improvement.
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Acknowledgments
The writers are most grateful to the officials of the Port and Airport Department, Kanto Regional Development Bureau, and Ministry of Land, Infrastructure and Transport, Japan, for providing the data for this material.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 138 • Issue 4 • April 2012
Pages: 451 - 460
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Apr 13, 2010
Accepted: Mar 16, 2011
Published online: Mar 17, 2011
Published in print: Apr 1, 2012
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