Abstract

The static behavior of Mississippi River Valley silt was characterized using triaxial compression testing. Silt specimens, especially over consolidated ones, showed dilation behavior. There was no unique critical state among specimens with different over consolidation ratios (OCRs). with OCRs of 1, 2, and 8, the specimens exhibited normal behavior and dilated more as effective consolidation pressure dropped. However, for an OCR of 4, the specimens showed opposite behavior and dilated more as effective consolidation pressure rose. the friction angle of the silt was computed on the basis of several failure criteria, and the limiting strain was found to be the best one owing to better consistency and rational results of the friction angle. the silt showed a unique behavior compared with sand and clay: The critical state line was not parallel to the normal consolidation curve in the e-lnp' space; the stress-strain behavior can be normalized by effective consolidation pressure. the normalized shear strength of over consolidated specimens was correlated to that of a normally consolidated specimen using Ladd et al.'s equation with a value of 0.58 for low-plasticity silts. However, the normalized shear strength of over consolidated silts cannot be related to OCR directly. It was indicated that at least the normalized shear strength of a normally consolidated specimen needs to be tested for low-plasticity silts to obtain the normalized shear strength of over consolidated specimen using Ladd et al.'s equation. © 2012 American Society of Civil Engineers.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Consolidated undrained; Low plasticity; Overconsolidation ratio; Silt; Slurry deposition; Triaxial; Unique monotonic behavior

International Standard Serial Number (ISSN)

1090-0241

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Society of Civil Engineers, All rights reserved.

Publication Date

17 Apr 2012

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