New Structure-Based Model for Estimating Undrained Shear Strength
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 10
Abstract
This paper presents an experimental study of the strength in anisotropic clays by means of centrifuge model, cone penetration, and vane shear tests. To understand the effects of void ratio, overconsolidation ratio, and testing rate on the undrained shear strength of anisotropic Speswhite clay, a new centrifugal testing technique is designed to obtain constant overconsolidation ratio (OCR) profiles with varying void ratios , called the “descending gravity test.” The parameters controlling the generation of peak shear strength are quantified. As a result of this function, a new material and rate-dependent surface is defined in the -OCR- space, which is identified as a “structural state capacity surface” since it relates the anisotropic structure to structure inherent capacity and properties. A new function for the estimation of excess pore pressure generated by cone penetration is found. By combining the strength and pore pressure functions a new model is proposed, called the “CU model.” The CU model is a structure-based model that provides reliable estimates of shear strength for in situ saturated clays using the knowledge of void and overconsolidation ratios. Finally, by combining - -OCR and - -OCR relationships, it estimates the void ratio and OCR profiles of anisotropic clays from piezocone penetration test results.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 10 • October 2007
Pages: 1290 - 1301
Copyright
© 2007 ASCE.
History
Received: Mar 30, 2006
Accepted: Mar 15, 2007
Published online: Oct 1, 2007
Published in print: Oct 2007
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