Use of Geocells to Improve Performance of Railway Track Beds


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Railway track bed consists of layers of ballast and subballast on subgrade soils. Ballast degradation can rapidly occur under heavy axle loadings over soft subgrade soils. Ballast excessive deformation and failure can lead to train speed reduction, track down time, and costly maintenance and repairs. Geocell stabilization of ballast reduces vertical pressures distributed onto the subgrade, prevents subgrade bearing failure, and reduces subgrade deformation. Geocell-stabilized ballast significantly reduces ballast movement, aggregate rotation and breakage, and rail settlement, thus resulting in increased railway track life and long-term performance. This webinar will start with possible problems of ballast degradation, explain mechanisms of geocell stabilization, demonstrate benefits of geocell stabilization through past and recent research, provide guidance of design, and present case studies of geocell stabilization to solve real problems in the field.

Learning Objectives:

  • Understand the benefits of geocell-stabilized ballast from past research and testing
  • Learn how geocell stabilization can reduce vertical ballast pressure and ballast movement
  • Understand the typical applications for geocell ballast stabilization
  • Learn how to apply geocell stabilization to extend rail life and reduce maintenance

PDH Credit Available

Speaker: Professor Dr. Jie Han, Ph.D., PE, F.ASCE, Glenn L. Parker Professor of Geotechnical Engineering, the University of Kansas, USA.

Dr. Jie Han is the Glenn L. Parker Professor of Geotechnical Engineering in the Civil, Environmental, and Architectural Engineering Department at the University of Kansas. He is a board governor of the ASCE Geo-Institute, a council member of the International Geosynthetics Society, the chair of the US Transportation Research Board (TRB) Transportation Earthworks committee, and the specialty chief editor of Frontiers of Built Environment. Prof. Han has gained extensive teaching, research, and industry experiences in geosynthetics, ground improvement, pile foundations, buried structures, and roadways. He is the sole author of the book entitled “Principles and Practice of Ground Improvement” and has published approximately 450 peer-reviewed journal and conference papers. Prof. Han has been invited to give more than 200 keynote/invited lectures and short courses around the world, including the State of the Practice Lecture at the 21st Annual George F. Sowers Symposium in Atlanta, Georgia in 2018, the 18th UK IGS Lecture in London in 2018, and the 3rd Robert M. Koerner Award Lecture in 2021. He has received numerous awards from the profession including but not limited to the 2014 the International Geosynthetics Society Award, the 2017 ASCE Martin S. Kapp Foundation Engineering Award, and the 2018 ASCE Kansas City Section Engineer of Year Award. Prof. Han was elected to the ASCE Fellow in 2014.

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Details

Starts:
March 1 12:00 pm EDT

Ends:
March 1 1:00 pm EDT

Organizer:
Megan M Firl

Email:
mmfirl@ifai.com

Venue:
Virtual