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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1697

Title: Full-scale field testing of colloidal silica grouting for mitigation of liquefaction risk
Authors: Gallagher, Patricia M.
Conlee, Carolyn T.
Rollins, Kyle M.
Keywords: Chemical grouting;Colloids;Silica;Liquefaction;Field tests;Full-scale tests
Issue Date: Feb-2007
Publisher: American Society of Civil Engineers
Citation: Journal of Geotechnical and Geoenvironmental Engineering, 133(2): pp. 186-196.
Abstract: This paper reports results of a full-scale field test to assess the performance of dilute colloidal silica stabilizer in reducing the settlement of liquefiable soil. Slow injection methods were used to treat a 2-m-thick layer of liquefiable sand. Eight injection wells were installed around the perimeter of the 9-m-diameter test area and 8% by weight colloidal silica grout was slowly injected into the upper 2 m of a 10-m-thick layer of liquefiable sand. A central extraction well was used during grout injection to direct the flow of the colloidal silica towards the center of the test area. Details of the field injection are described. Subsequently, the injection wells were used to install explosive charges and liquefaction was induced by blasting. After blasting, approximately 0.3 m of settlement occurred versus 0.5 m of settlement in a nearby untreated area. The mechanism of improvement is thought to be bonding between the colloidal silica and the individual sand particles; the colloidal silica gel encapsulates the soil structure and maintains it during dynamic loading.
URI: http://dx.doi.org/10.1061/(ASCE)1090-0241(2007)133:2(186)
Appears in Collections:Faculty Research and Publications (CAEE)

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