Geogrid reinforcement of railroad ballast improves its structural response under loading, limits lateral movement of ballast particles, and reduces vertical settlement through effective geogrid-ballast interlocking. This improved performance can be linked to improved shear strength and resilient modulus properties. An ongoing research study at Boise State University is focusing on investigating the effects of different specimen and test parameters on the mechanism of geogrid-ballast interaction. A commercially available Discrete Element Modeling (DEM) program (PFC3D®) is being used for this purpose, and the effect of geogrid inclusion is being quantified through calculation of the “Geogrid Gain Factor”, defined as the ratio between resilient-modulus of a geogrid-reinforced ballast specimen and that of an unreinforced specimen. Typical load-unload cycles in triaxial shear strength tests are being simulated, and parametric studies are being conducted to determine the effects of particle-size distribution, geogrid aperture size, and geogrid location on railroad-ballast modulus. This paper presents findings from the research study, and presents inferences concerning implications of the study findings on design and construction of better-performing ballast layers.
Skip Nav Destination
2018 Joint Rail Conference
April 18–20, 2018
Pittsburgh, Pennsylvania, USA
Conference Sponsors:
- Rail Transportation Division
ISBN:
978-0-7918-5097-8
PROCEEDINGS PAPER
Effect of Geogrid Inclusion on Ballast Resilient Modulus: The Concept of ‘Geogrid Gain Factor’
S. M. Naziur Mahmud,
S. M. Naziur Mahmud
Boise State University, Boise, ID
Search for other works by this author on:
Debakanta Mishra,
Debakanta Mishra
Boise State University, Boise, ID
Search for other works by this author on:
David O. Potyondy
David O. Potyondy
Itasca Consulting Group, Inc., Minneapolis, MN
Search for other works by this author on:
S. M. Naziur Mahmud
Boise State University, Boise, ID
Debakanta Mishra
Boise State University, Boise, ID
David O. Potyondy
Itasca Consulting Group, Inc., Minneapolis, MN
Paper No:
JRC2018-6126, V001T01A005; 10 pages
Published Online:
June 14, 2018
Citation
Mahmud, SMN, Mishra, D, & Potyondy, DO. "Effect of Geogrid Inclusion on Ballast Resilient Modulus: The Concept of ‘Geogrid Gain Factor’." Proceedings of the 2018 Joint Rail Conference. 2018 Joint Rail Conference. Pittsburgh, Pennsylvania, USA. April 18–20, 2018. V001T01A005. ASME. https://doi.org/10.1115/JRC2018-6126
Download citation file:
55
Views
Related Proceedings Papers
Flow Assurance for Deepwater Mining
OMAE2010
Related Articles
Modelling Particulate Deposition in Gas Turbines Part II: Prediction and Validation of Deposition Distributions
J. Turbomach (January,0001)
Developing a High-Powered Diesel Engine for Railway Traction
J. Eng. Power (October,1968)
Effects of Physical and Sorption Properties of Desiccant Coating on Performance of Energy Wheels
J. Heat Transfer (June,2017)
Related Chapters
The Stirling Engine
Air Engines: The History, Science, and Reality of the Perfect Engine
Start-Up, Shutdown, and Lay-Up
Consensus on Pre-Commissioning Stages for Cogeneration and Combined Cycle Power Plants
Two Decades of Optimism
Air Engines: The History, Science, and Reality of the Perfect Engine