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Permeability of Cement Grout Plugs in Basaltic Rocks

by Haluk Akgun, Environtech Consultants Inc, Boca Raton, United States,
Jaak J. K. Daemen, Environtech Consultants Inc, Boca Raton, United States,



Document Type: Proceeding Paper

Part of: Environmental Engineering

Abstract:

Flow tests have been conducted on expansive cement grout plugs with diameters of 160 mm and 200 mm, and length-to-diameter ratios of one, in boreholes in basalt blocks, and in steel pipes. Two types of flow tests have been performed: pseudo-constant head tests and transient pulse tests. During flow tests, basalt blocks have fractured, presumably due to a combination of water injection pressure, cement grout expansion, and packer contact pressure. Falling head tests performed on one confined block fracture implied a complicated interaction between a cement grout borehole plug and the rock, as determined from the hydraulic conductivity of the fracture that intersected a plugged borehole.

Subject Headings: Grouting | Cement | Boring | Water pressure | Volcanic deposits | Hydraulic fracturing | Steel pipes

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