The evaluation of the field vane shear strength analysis of the Glen Aiken creek embankment failure Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zw12z869j

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  • Vane shear strength analysis of the Glen Aiken creek embankment failure
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  • A post-failure investigation of a highway embankment constructed over organic and sensitive subsoils was made with a series of field vane tests. The results indicated that the embankment was quite stable, and, therefore, the reliabilities of both the Φ = 0 slip-circle analysis and the field vane results seemed to be highly questionable. Undisturbed samples taken from an area unaffected by the embankment failure were used to determine the undrained shear strength of these subsoils. The results of both the laboratory vane and unconfined compression tests were appreciably below the results of the field vane tests, but they were not low enough to completely explain the instability of the embankment. It was concluded that a progressive failure of the highly sensitive organic silty clay was partly responsible for the inaccuracy of the Φ = 0 slip-circle stability analysis. However, the major error resulted from the inaccuracies of the field vane results. The effect of the rate of rotation of the laboratory vane upon the undrained shear strength was found to be insignificant. Since the vane basically determines the shear strength developed on the vertical plane, the difference between the shear strength developed on the horizontal plane and vertical plane was studied. Finally, the method of evaluating rod-friction was investigated. It was found that the use of the "dummy" rod for the evaluation of the frictional resistance developed on the field vane's torque rod was inaccurate. This fact was demonstrated by the comparison of original field vane test results with results obtained from a modified slip-joint field vane, capable of directly measuring the rod-friction. It was concluded that a modified slip-joint field vane accurately measured the in situ undrained shear strength. The fact that silty clays found at the highway embankment site were sensitive was not indicated by either the original field vane or the modified slip-joint field vane. The actual sensitivity of these subsoils was determined by both the laboratory vane and the liquidity index of the soils. It was concluded that the in situ sensitivity could not be obtained by the modified slip-joint field vane. The one point that the entire investigation indicated was that before the field vane test results can be intelligently used, additional information about the subsoils is required.
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  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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  • description.provenance : Made available in DSpace on 2014-04-16T18:17:15Z (GMT). No. of bitstreams: 1 ClarkeJamesD1968.pdf: 625846 bytes, checksum: c4f3cf35a617086238c38c99d10abd43 (MD5) Previous issue date: 1967-06-01
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