Contaminant Transport through a Compacted Clay Liner with the Consideration of Consolidation Effects

Hefu Pu, Patrick J. Fox, Charles D. Shackelford

Research output: Contribution to journalConference article

3 Scopus citations

Abstract

This paper presents the results of a numerical study pertaining to the significance of consolidation of a compacted clay liner (CCL) on contaminant transport through the CCL serving as the barrier component in a solid waste impoundment bottom liner system. Numerical simulations were conducted using the validated CST2 model, which accounts for one-dimensional coupled large strain consolidation and contaminant transport in saturated porous media. Simulation results indicate that CCL consolidation can play a significant role on contaminant transport through the CCL during the entire 40-year evaluation period. Analyses based on traditional advective-dispersive transport neglect the transient advective transport and changes in CCL properties caused by consolidation process and, therefore, can lead to significantly different results. For the simulations with initial CCL thickness of 0.5, 1, and 1.5 m, consolidation is shown to decrease the steady-state contaminant mass flux by 59%, 67%, and 71%, respectively, and thus ignoring consolidation would produce conservative transport result for single CCL.

Original languageEnglish (US)
Pages (from-to)118-127
Number of pages10
JournalGeotechnical Special Publication
Volume2016-January
Issue number273 GSP
DOIs
StatePublished - Jan 1 2016
Event5th Geo-Chicago Conference: Sustainable Waste Management and Remediation, Geo-Chicago 2016 - Chicago, United States
Duration: Aug 14 2016Aug 18 2016

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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