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Sep 29 2023

Vertical Barriers for Control of Seepage and Contaminant Transport

CME Department Seminar

September 29, 2023

11:00 AM - 12:00 PM America/Chicago


1047 ERF


842 W. Taylor St., Chicago, IL 60607

Presenter: Jeffrey C. Evans

Location: 1047


Slurry trench cutoff walls have been used to construct vertical barriers in the subsurface to control groundwater flow and contaminant transport for well over 50 years. Throughout this long history, there also have been developments in our understanding of the underlying mechanisms impacting their performance. At the same time, alternative methods to construct vertical barriers have been developed including numerous in situ mixing methods such as cutter-soil-mixing (CSM) and the trench remixing and deep wall method (TRD). Developments in slurry trench technology have also included material variations such as slag-cement-bentonite and soil-cement-bentonite. This presentation will provide an overview of the primary techniques currently employed and identify the principal functions of vertical barriers for control of seepage and contaminant transport.  The presentation will then present design and construction methods for the primary techniques with a particular focus on the state of the practice.


Speaker Bio:

Dr. Evans is Professor Emeritus of Civil and Environmental Engineering at Bucknell University, Lewisburg, PA. He earned BS, MS and PhD degrees in Civil Engineering from Clarkson, Purdue, and Lehigh, respectively. He has been at Bucknell since 1985 where honors include the Class of ’56 Lectureship (1997) for inspirational teaching, and Presidential Professor (2001) for contributions to the University. He was named Overseas Fellow at Cambridge University (Churchill College, 2012). In England, he has been a visiting academic in the Cambridge University (2012-13), at the University of Nottingham (1998-99) and a Senior Scientific Officer (1991-92) at the Warren Spring Laboratory. Prior to joining Bucknell he spent over 10 years as a consultant with Woodward-Clyde Consultants (now AECOM) where he was named “Young Professional of the Year” in 1984. His experience also includes the U.S. Army Corps of Engineers Reserves where he served as a 2nd Lieutenant, 1st Lieutenant and Captain. He has authored and co-authored over 100 publications in the areas of geotechnical, ground improvement and geoenvironmental engineering. He has also co-authored three books (Hazardous Waste Management, Fundamentals of Ground Improvement and Slurry Trenching: History, Uses, Fundamentals and Construction) along with Chapters in eight other books.


Dr. Krishna Reddy

Date posted

Nov 1, 2023

Date updated

Nov 1, 2023