Study of the yielding of sand under generalized stress conditions using a versatile hollow cylinder torsional apparatus

Abstract

Please cite this article as: O'Kelly, B.C., Naughton, P.J., Study of the yielding of sand under generalized stress conditions using a versatile hollow cylinder torsional apparatus, Mechanics of Materials (2008Materials ( ), doi: 10.1016Materials ( / j.mechmat.2008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT AbstractThe hollow cylinder torsional apparatus (HCTA) is particularly suited to studying the mechanical behavior of cross-anisotropic test specimens since the magnitudes of the three principal stresses and the orientation of the major-minor principal stress axes can be independently controlled. Novel features of the University College Dublin HCTA, particularly the instrumentation and calibration procedures necessary to achieve accurate generalized stress path testing, are presented. The plastic yield behavior of fully saturated Leighton Buzzard sand was studied under generalized stress conditions. Physically identical test-specimens (35.5 mm inner radius, 50.0 mm outer radius and 200 mm in length) were prepared using a water-pluviation technique that reproduces the inherent cross-anisotropic fabric of many natural sand deposits. A series of stress path tests systematically probed the stress space to locate segments of yield loci. The deviator stress at yield was found to vary in a well-defined pattern that depended on the magnitude of the intermediate principal stress parameter. However, the deviator stress at yield was largely independent of reorientations of the major principal stress that had occurred during the initial anisotropic consolidation stage of the tests. The experimental yield data was used to show that the Matsuoka-Nakai and Lade yield criteria provide satisfactory predictions of the onset of plastic yielding in sand deposits under generalized stress conditions for routine geotechnical engineering design.

Shear banding in torsion shear tests on cross-anisotropic deposits of fine Nevada sand

“…This may be done in directional shear or in torsion shear equipment with different pressures applied inside and outside the hollow cylinder specimen. Limited and sporadic experimental results have been provided in this respect by Arthur and Menzies (1972), Arthur and Phillips (1975), Hight et al (1983), Miura et al (1986), Pradel et al (1990), O'Kelly (2007), O'Kelly andNaughton (2009) and by Chairo et al (2013). While these studies indicated some variation in the friction angle, none provided a complete picture.…”

Pre-shear effect on liquefaction resistance of a Fujian sand

“…Hollow cylinder torsional shear tests have been extensively used in the investigation of inherent and stress-induced anisotropy of soil (e.g., [10][11][12][13][14][15][16]). Using a hollow cylinder torsional apparatus to study the liquefaction characteristics of sand is also found in previous studies (e. g., [17][18][19][20][21][22][23]).…”