Numerical model for analyzing slug tests in vertical cutoff walls

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Analysis of a slug test estimating the hydraulic conductivity of a vertical cutoff wall is complicated by the high compressibility of backfill materials and by the proximity of a well to the edge of the cutoff wall. An implicit finite-difference program, named Slug_3, was developed to analyze results of slug tests in the vertical cutoff wall. The program uses block-centered mesh formulation, considers variable hydraulic conductivity and specific storage, and has automatic time-step control and mesh generation. The geometry and flux-boundary condition in the well-intake section is fully considered, and the interface between a cutoff wall and natural soil formation is modeled as a constant head-boundary condition. Also, a filter cake can be simulated in Slug_3. Slug_3 is verified by comparing results with an analytical solution for a partially penetrating well in aquifers and another numerical code, MODFLOW-96, for a vertical cutoff wall. The program provides a new analytic tool for analyzing slug-test results from vertical cutoff walls and is unique in the ability to simulate variable hydraulic properties, which can be particularly important for highly compressible materials such as soil-bentonite backfill in a cutoff wall.

Original languageEnglish
Pages (from-to)1249-1258
Number of pages10
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume133
Issue number10
DOIs
Publication statusPublished - 2007 Oct 1

Fingerprint

slug test
cutoff wall
Hydraulic conductivity
Numerical models
Boundary conditions
Soils
Mesh generation
Bentonite
Aquifers
Compressibility
slug
Hydraulics
Fluxes
backfill
Geometry
hydraulic conductivity
boundary condition
hydraulic property
compressibility
bentonite

Keywords

  • Backfills
  • Core walls
  • Hydraulic conductivity
  • Numerical models
  • Wells

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Environmental Science(all)

Cite this

Numerical model for analyzing slug tests in vertical cutoff walls. / Choi, Hangseok.

In: Journal of Geotechnical and Geoenvironmental Engineering, Vol. 133, No. 10, 01.10.2007, p. 1249-1258.

Research output: Contribution to journalArticle

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