ISSN: 1945-7545
Page Count: 11

Effective Stress Hyperbolic Stress-Strain Parameters for Clay

Stark, TD
Assistant professor of civil engineering, University of Illinois, Urbana,IL

Vettel, JJ
Instructor of civil engineering, San Diego State University, San Diego,CA

Abstract

This paper presents a procedure for estimating the effective stress hyperbolic stress-strain parameters for normally consolidated clays from the results of consolidation and direct shear tests. The procedure for calculating Young's modulus and the modulus number includes: (1) estimating the failure ratio from the shear stress-horizontal displacement curve obtained from a direct shear test; (2) using a tangent modulus at the end of each normally consolidated load increment in the consolidation test and the void ratio at the beginning of each load increment to calculate Young's modulus; and (3) multiplying the resulting modulus number by 1.9 to obtain a reasonable estimate of the isotropically consolidated-drained triaxial (CID) modulus number. The modulus exponent was approximately unity for both the consolidation and CID triaxial tests. A procedure for estimating the bulk modulus number, the bulk modulus exponent, and the unload-reload modulus number is also presented.

Keywords:
clays, effective stress, finite element, elasticity modulus, deformation modulus

Paper ID: GTJ10556J
DOI: 10.1520/GTJ10556J
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