217. EXPERIMENTAL AND COMPUTATIONAL INVESTIGATION OF CONSOLIDATION-INDUCED CONTAMINANT TRANSPORT FOR HIGH WATER CONTENT GEO-MATERIALS

Department: Structural Engineering
Faculty Advisor(s): Patrick Joseph Fox

Primary Student
Name: Hefu Pu
Email: hepu@ucsd.edu
Phone: 858-888-2416
Grad Year: 2014

Abstract
The objective of this project is to investigate the effect of consolidation of high water content geomaterials on the transport and release of contaminants contained within these materials. The phenomenon of coupled consolidation and contaminant transport occurs for a variety of practical applications in geotechnical and geoenvironmental engineering. Research has demonstrated only very recently that consolidation-induced transport of contaminants is a valid transport mechanism that, depending on conditions, may have lasting effects on the contaminant migration behavior for a given system. However, little is known about the general significance of this mechanism for practical applications in geotechnical and geoenvironmental engineering. Current understanding of consolidation-induced contaminant transport is limited with respect to the following: (1) The effects of higher chemical concentrations and multispecies contaminants, such that typically occur in field sites, have not been investigated; (2) Little is known regarding the importance of facilitated transport via colloidal particles, which is likely to be an important mechanism for natural fine-grained materials with highly sorbed contaminants; (3) No work has been conducted for constant-rate-of-strain or centrifuge loading conditions; (4) Little is known with regard to the importance of consolidation-induced transport for practical applications, including facilities with layered high-water content geo-materials. The objective of the proposed research is to conduct a fundamental experimental and computational investigation of the mechanism of consolidation-induced transport of contaminants for a variety of realistic materials and conditions, and then assess the significance of these findings for relevant applications. The research plan has six tasks: (1) material procurement and characterization; (2) material property testing; (3) consolidation-induced transport testing; (4) development and validation of computational models; (5) computational simulations; and (6) project collaboration and dissemination of results.

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