Indian Science Technology and Engineering facilities Map
 
Supplier Map
Service Map

Publications

Publication Details

Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
Sweta and Hussaini 
Corresponding Authors:
Hussaini 
DOI #:
https://doi.org/10.1016/J.GEOTEXMEM.2017.12.001 
Title:
Effect of shearing rate on the behavior of geogrid-reinforced railroad ballast under direct shear conditions. Geotextiles and Geomembranes 
Journal:
Geotextiles and Geomembranes 
Year:
2018 
Volume:
46 
Page:
251 
Keywords:
Railroad ballast, geogrid-reinforced 
Abstract:
A series of large-scale direct shear tests were conducted to investigate the behavior of unreinforced and geogrid-reinforced ballast at different rates of shearing. Fresh granite ballast with an average particle size ( D 50 ) of 42 mm and five geogrids having different aperture shapes and sizes was used in this study. Tests were performed at different normal stresses ( σ n ) ranging from 35 kPa to 140 kPa and at different rates of shearing ( S r ) ranging from 2.5 to 10.0 mm/min. The laboratory test results revealed that the shear strength of ballast was significantly influenced by the rate of shearing. The internal friction angle of ballast ( φ ) was found to decrease from 66.5° to 58° when the shearing rate ( S r ) was increased from 2.5 to 10.0 mm/min. It is further observed that the interface shear strength has improved significantly when the ballast was reinforced with geogrids. The interface efficiency factor ( α ), defined as the ratio of the shear strength of the interface to the internal shear strength of ballast, varies from 0.83 to 1.06. The sieve analysis of samples after the testing reveals that a significant amount of particle breakage occurs during shearing. The value of breakage, evaluated in terms of Marsal's breakage index ( B g ), increases from 5.12 to 13.24% with an increase in shearing rates from 2.5 to 10.0 mm/min. Moreover, the influence of aperture shape and size of geogrid on the behavior of ballast-geogrid interfaces was also examined in this study. 
Entered by:
Physics Head on 2020-08-03 
 
THE VISION
THE MISSION
ABOUT I-STEM
It has always been the basic tenet of the Government of India, in generously funding R&D efforts at academic institutions over the years, that facilities established through such support be made available to those needing them and qualified to make use of them for their own research work
read more >>

However, this was never easy or straightforward for, among other reasons, there was no ready source of information of what facility was available and where. Thanks to the Web, it is much easier today to have a national and regional “inventory of resources”, so as to match users with the resources they need, and to do all this in an efficient and transparent manner.

This can lead to a leap in R&D productivity and greatly enhance the effectiveness of public investment. This is the motivation behind I-STEM.
read less <<
Visitor Hit Counter
Hosted at Indian Institute of Science
Copyright © 2024 I-STEM. All rights reserved.
Audited by: STQC Bengaluru.