Abstract/Details

Evaluation of ballast materials based on ballast particle characteristics and functions


1998 1998

Other formats: Order a copy

Abstract (summary)

The objective of this dissertation is to develop a ballast quality evaluation computer model based on the relations among the ballast particle characteristics and ballast performance.

Much effort has been given in the past to seek suitable criteria for ballast material selection considering ballast performance and maintenance costs. But the selection of ballast material has appeared to be based on limited information without full regard to the effect of ballast particle characteristics on the ability of ballast to fulfill its functions in track. This will result in some misjudgments in the ballast material selection.

The developed model can quantify the ballast suitability with a ballast quality index which has taken the basic ballast particle characteristics and the main ballast field functions into consideration. The basic ballast particle characteristics included are shape, angularity, surface texture, gradation, and specific gravity. The main ballast field functions for track are providing resistance forces, resiliency, void storage, drainage, and facilitating maintenance. The ballast particle characteristics are numerically related to the ballast field functions based on available data from field and laboratory tests on granular materials and some assumptions. Weighting factors are used to represent the relative importance of the basic ballast particle characteristics to each ballast function and then the relative importance of the main ballast functions to the overall ballast field performance.

The developed model is evaluated using the ballast field data related to the track performance. The verification results show that the developed ballast quality index can reflect the ballast quality.

Indexing (details)


Subject
Civil engineering;
Mining
Classification
0543: Civil engineering
0551: Mining
Identifier / keyword
Applied sciences; modulus; railroad tracks; subgrade; triaxial test; void ratio
Title
Evaluation of ballast materials based on ballast particle characteristics and functions
Author
Han, Xiangdong
Number of pages
167
Publication year
1998
Degree date
1998
School code
0118
Source
DAI-B 59/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780591758207, 0591758202
Advisor
Selig, Ernest T.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9823742
ProQuest document ID
304461548
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304461548
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.