FUTURE ADVANCES IN SOIL PLACEMENT AND IMPROVEMENT

In response to objections to the use of line as a soil modifier (for railroad applications) to reduce the shrinkage and swelling of expansive clays because of the leaching of the lime with time, the author notes that a 25-mm-deep mastic seal laid over the lime. Modified soil followed by a well or broadly graded sub-ballast and then top ballast will prevent the aforesaid leaching. The author also defends his doubling the theoretical vertical stress and using static safe bearing pressures' on the grounds that large permanent displacements occurred in subgrade type soil under cyclic loading when the cycled stress was 40%-60% of the static stress. Their, the only alternative would have been to undertake an extensive repeat load testing program to establish the "pepeated load safe bearing pressure".

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Filing Info

  • Accession Number: 00308191
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14934
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM