Hydraulic Conductivity Assessment of Slurry Wall Using Piezocone Test
Publication: Journal of Geotechnical Engineering
Volume 120, Issue 10
Abstract
Cone‐penetration tests (CPTs) with pore pressure measurement or piezocone tests (CPTUs) are carried out inside a cutoff wall for polluted‐ground‐water containment. The backfilling material for the cutoff wall is a typical cement‐bentonite (CB) self‐hardening slurry whose composition is 76.8% water, 19.2% blast furnace cement, and 4% sodium bentonite. A tentative framework for interpretation of CPTUs in terms of hydraulic conductivity is developed. In particular, a continuous assessment of hydraulic conductivity along a vertical profile is attempted by combining the piezocone penetration parameters [i.e. total point resistance , pore‐pressure increment , and sleeve friction ]. The obtained results are comparable with results from CPTU dissipation tests, in‐situ borehole infiltration tests, and laboratory tests performed on the same CB mixture. The test results indicate that the CPTUs are a promising tool for in‐situ quality control of cutoff walls in terms of evaluating the actual hydraulic conductivity of the completed cutoff wall and, to some extent, of detecting and locating hydraulic defects that, in many cases, are the main causes of poor in‐situ performance.
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Information & Authors
Information
Published In
Journal of Geotechnical Engineering
Volume 120 • Issue 10 • October 1994
Pages: 1725 - 1746
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 9, 1993
Published online: Oct 1, 1994
Published in print: Oct 1994
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