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http://dx.doi.org/10.7843/kgs.2008.24.11.121

Evaluation of Hydraulic Conductivity of Slurry-wall-type Vertical Cutoff Wall with Consideration of Filter Cake  

Nguyen, The Bao (Department of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Lee, Chul-Ho (Department of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Choi, Hang-Seok (Department of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Kim, Sang-Gyun (Chungsuk Eng.)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.11, 2008 , pp. 121-131 More about this Journal
Abstract
In constructing a slurry trench cutoff wall, bentonite-water slurry is used to secure the stability of sidewalls during excavation before the wall is completed by backfilling. Unexpectedly, a thin but relatively impermeable layer called filter cake can be formed on the excavation surface, which significantly influences the result of slug test analysis in the cutoff wall if not considered. This study is to examine the effect of filter cake on evaluating hydraulic conductivity of the vertical cutoff wall through slug test analysis with the aid of the verified numerical program Slug_3D. The no-flux boundary conditions were adopted in Slug_3D to simulate the filter cake on the interface between the wall and the natural soil. A new set of type curves were built for applying the type curve method. New modification factors were obtained for using the modified line-fitting method. With consideration of filter cake, the type curve method and the modified line-fitting method were adopted to reanalyze the case study taken from EMCON (1995). The previous results achieved by Choi and Daniel (2006) without consideration of filter cake were compared with the present results obtained in this paper. The comparison emphasizes the necessity of considering filter cake when analyzing slug test results in vertical cutoff walls.
Keywords
Filter cake; Line-fitting method; Slug test; Type curve method; Vertical cutoff wall;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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