STRESSING BALLAST, SUBBALLAST

This article presents a summary of research on recently conducted static and cyclic triaxial testing of railroad ballast and subballast. The cyclic tests simulated the behavior of the ballast granular materials, which included crushed basalt for the ballast and well-graded sand with gravel for the subballast, under a large number of passing train wheels. The static tests identified the maximum stress level that could be applied in the cyclic tests, as well as assessing the strength and stiffness increase produced during the cycling and loading process. A new measuring device was developed in order to accurately monitor the circumferential displacement during the tests. The tests were conducted using a constant confining pressure to simulate the mean pressure stemming from geostatic stresses in a railway structure. Both the reversible and irreversible components of the vertical and circumferential displacements were measured.

  • Availability:
  • Corporate Authors:

    Simmons-Boardman Publishing Corporation

    345 Hudson Street
    New York, NY  United States  10014
  • Publication Date: 2005-8

Language

  • English

Media Info

  • Features: Tables;
  • Pagination: pp 33-35
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01005536
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Oct 19 2005 1:59PM