The effect of an abrupt change in the elastic foundation properties upon the motion of a high speed vehicle is investigated in detail in this study. Limiting allowable accelerations are chosen as the criteria for riding quality. The study indicates that there is a likelihood of encountering a variety of elastic soil combinations which can seriously deteriorate the riding qualities of a rail vehicle on conventional track. As remedial measures, two alternatives are considered to improve the quality of ride; one by improving the rigidity of the track structure by means of providing a track structure utilizing narrow vertical walls embedded in the subsoil, and the other by carefully compacting the foundation soil to minimize local variations. A study is also made to evaluate the relative economics of the alternatives.

  • Supplemental Notes:
    • This abstract is also contained in "A Bibliography on the Design and Performance of Rail Track Structures", September 1974, RRIS #072794, which was prepared for the Urban Mass Transportation Administration.
  • Corporate Authors:

    Carnegie Mellon University

    Transportation Research Institute
    Pittsburgh, PA  United States  15213
  • Authors:
    • Bhatia, G S
    • Thiers, G R
  • Publication Date: 1968-3

Media Info

  • Pagination: 103 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00072838
  • Record Type: Publication
  • Contract Numbers: C-222-66
  • Files: TRIS
  • Created Date: Feb 11 1976 12:00AM