Research Article
Jun 1978
Triaxial Tests on Dolomite Railroad Ballast
Publication: Journal of the Geotechnical Engineering Division
Volume 104, Issue 6
Abstract
Triaxial static compression and extension tests using low confining pressures have been performed on a fine mineral grained tough dolomite railroad ballast. The shear strength and tangent modulus increased significantly with both confining pressure and density increase, indicating the importance of both crib depth and compaction in maintaining the stability of unloaded track (i.e., preventing sun kinks). Of particular importance is the high apparent cohesion at the low cell pressure in comparison with tests reported elsewhere on sands and rounded gravels indicating the importance of a high percentage of crushed faces which is contrary to tests reported by others at high cell pressures where crushed material has lower strengths. A similar contradiction was also noted for particle size. Comparison with other results indicates larger particles probably give higher strengths at low cell pressures. The volume and axial strains are also reported in terms of initial pseudo-Poisson's ratio and in terms of stress dilatancy.
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Published In
Journal of the Geotechnical Engineering Division
Volume 104 • Issue 6 • June 1978
Pages: 737 - 751
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: Jun 1978
Published online: Feb 11, 2021
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Authors
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Gerald Patrick Raymond, M.ASCE
Prof. of Civ. Engrg., Queen's Univ., Kingston, Ontario, Canada
John R. Davies
Asst. Prof. of Civ. Engrg., Queen's Univ., Kingston, Ontario, Canada
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.