In-Place Permeability Measurement of Slurry Trench Cutoff Walls

by Ray M. Teeter, Syracuse Univ, Syracuse, NY, USA,
Samuel P. Clemence, Syracuse Univ, Syracuse, NY, USA,



Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering

Abstract:

A suggested procedure for the in-place measurement of slurry trench cutoff wall permeability is presented. The H. Bouwer and Rice method, employing a single observation well and variable-head testing, can be applied, and a simple flow net approach can be used to develop a correction factor accounting for the effects of cutoff wall thickness. Although additional work would be desirable to more fully verify the procedure, it appears that the conventional observation well approach holds a number of advantages over other forms of testing. The subjects of filter cake effects and hydraulic fracturing, as they relate to permeability and its measurement, are also discussed.

Subject Headings: Diaphragm walls | Permeability (soil) | Trenches | Flow measurement | Permeability (material) | Thickness | Observation wells

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