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Soils and Foundations 2013;53(3):462–468 The Japanese Geotechnical SocietySoils and Foundationswww.sciencedirect.com journal homepage: www.elsevier.com/locate/sandf A new laboratory apparatus for studying dynamic compaction groutinginto granular soils S.Y. Wanga,*, D.H. Chanb,1, K.C. Lamc,2, S.K.A. Aud,3 aARC Centre of Excellence for Geotechnical Science and Engineering, Department of Civil, Surveying and Environmental Engineering, The University of Newcastle Callaghan, NSW 2308, Australia bDepartment of Civil and Environmental Engineering, University of Alberta, Canada T6G 2W2 cDepartment of Building and Construction, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong dDepartment of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong KongReceived 25 May 2010; received in revised form 25 June 2012; accepted 15 July 2012 Available online 2 May 2013AbstractAs granular soils may be compressible or have inadequate strength, compaction is particularly useful when soils are subjected to dynamic loading or cyclic loading. A new laboratory apparatus for investigating dynamic compaction has been designed and fabricated. The basic principle of this new technique is to introduce vibrations during the expansion process in static compaction grouting. In these tests, the injection pressure, the excess pore water pressure, and the change in void ratio of the specimens are measured. The main focus is to investigate the development of the injection pressure, the void ratio, and the excess pore water pressure due to dynamic compaction and the subsequent consolidation of the soils. In addition, the relative density of the soils is used to evaluate the dynamic compaction efficiency. Scaled laboratory experiments are conducted to study the effect of this dynamic compaction frequency on compaction efficiency. The experimental results show that the change in void ratio in the dynamic compaction tests is about four times greater than that in the static compaction tests. Dynamic compaction frequency plays an important role in soil densification due to dynamic compaction. © 2013 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved.Keywords: Dynamic compaction; Frequency; Soil densification; Compaction efficiency IntroductionDuring the past decades, with the development of building construction and geotechnical engineering, soil improvement by*Corresponding author. Tel.: +61 2 4921 5745; fax: +61 2 4921 6991. E-mail addresses: [email protected], [email protected] (S.Y. Wang), [email protected] (D.H. Chan), [email protected] (K.C. Lam), [email protected] (S.K.A. Au).1Tel.: +1 780 492 4725; fax: +1 780 492 0249/+1 780 492 8198. 2Tel.: +852 2788 7238; fax: +852 2788 7238. 3Tel.: +852 2857 8552; fax: +852 2559 5337.Peer review under responsibility of The Japanese Geotechnical Society. densification has shown much growth in the world, and more and more poor or unstable soils are encountered in many projects. If granular soils are compressible or have inadequate strength, compaction is particularly useful when soils are subjected to dynamic loading or cyclic loading. Both dynamic compaction and vibro-compaction are capable of achieving significant densi-fication of loose granular deposits (Greenwood and Kirsch, 1984). The effects of vibrations on granular soils are changes in density and in the state of the pore pressure in the material. The use of the vibratory method, therefore, is an effective means of compacting soils (Mitchell and Jardine, 2002). Compaction grouting is a traditional technology for soil improvement; it is performed by injecting highly viscous grout under high pressure to compact a compressible soil (Graf, 1969; Warner and Brown, 1974). Many researchers have created physical0038-0806 © 2013 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.sandf.2013.04.007

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