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

Keywords

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

ASJC Scopus subject areas

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

Cite this