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Date of Publication:2008-01-01

Journal:岩土力学

Affiliation of Author(s):建设工程学部

Issue:8

Page Number:2277-2282

ISSN No.:1000-7598

Abstract:A series of unconsolidated-undrained (UU) triaxial tests are performed in order to examine the effect of strain rate and confining pressure on strength and stress-strain behavior of reconstituted saturated clays. Strain rate is controlled to vary between 0.015%/min and 3.75%/min. It is found by comparing the experimental data that strength and stress-strain behavior are mainly affected by strain rate, however, they are almost independent on confining pressure. Undrained shear strength of the saturated clay increases with increase of strain rate; and the increase of 70% of strength may be attained. An empirical correlation between strength and strain rate is proposed after a given normalization. Furthermore, the hyperbolic constitutive model of nonlinearity is recommended in order to take the effect of strain rate on the stress-strain relation into consideration; and the experimentally-based procedure for defining the parameters in the hyperbolic model is given. The model is verified through test data in the monotonic triaxial and torsional shear tests.

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