Journal ArticleDOI
Double‐Yield‐Surface Cam‐Clay Plasticity Model. I: Theory
TLDR
In this paper, a constitutive model for the stress-strain-time behavior of cohesive soils is developed using Cam-clay plasticity theory extended to include time-dependent effects.Abstract:
A constitutive model for the stress‐strain‐time behavior of cohesive soils is developed using Cam‐clay plasticity theory extended to include time‐dependent effects. The model adopts the concept of separating the total deformation into immediate and delayed components. The immediate plastic deformation is evaluated by employing the associative flow rule on each of two distinct yield surfaces defined by the ellipsoid of the modified Cam‐clay theory and the Von Mises cylinder inscribed in the Cam‐clay ellipsoid. The delayed component of deformation is evaluated by employing the normality rule on equivalent ellipsoidal and cylindrical yield surfaces associated with the current state of stress of the soil and forcing the resulting creep strain rate tensor to satisfy phenomenological creep laws. In a companion paper by the same writers, the resulting constitutive equation is shown to predict the stress‐strain‐time behavior of wet clays more accurately than an earlier version based on a single‐yield‐surface form...read more
Citations
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Journal ArticleDOI
Characterization of Models for Time-Dependent Behavior of Soils
TL;DR: Different classes of constitutive models have been developed to capture the time-dependent viscous phenomena (creep, stress relaxation, and rate effects) observed in soils as mentioned in this paper, which are based on empirica.
Journal ArticleDOI
A simple critical-state-based double-yield-surface model for clay behavior under complex loading
TL;DR: In this article, the location of the critical state line is explicitly considered and related to the actual material density to control the peak strength and the phase transformation characteristics of clays under complex loading including changes of stress direction.
Journal ArticleDOI
Predicting the long-term performance of a wide embankment on soft soil using an elastic–viscoplastic model
TL;DR: In this article, an elastic-viscoplastic (EVP) constitutive model is used to represent the foundation soil for the coupled finite element analysis (FEA), and a unitcell analysis is carried out to capture the maximum settlement and the development of excess pore-water pressure with time below the centreline of the embankment for a long period (9 years).
Journal ArticleDOI
Generalized creep and stress relaxation model for clays
TL;DR: In this article, the authors treat creep and stress relaxation as two separate phenomena, although physical processes are most useful in predicting soil behavior, however, they are often treated as separate phenomena.
Journal ArticleDOI
Behavior of an Atypical Embankment on Soft Soil: Field Observations and Numerical Simulation
TL;DR: In this article, the behavior of an embankment with nonsymmetric geometry built on soft soil with that predicted numerically using four elastoplastic soil models is compared, with the isotropic models performing best.
References
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Journal ArticleDOI
Nonlinear Analysis of Stress and Strain in Soils
James M. Duncan,Chin-Yung Chang +1 more
TL;DR: In this article, a simple, practical procedure for representing the nonlinear, stress-dependent, inelastic stress-strain behavior of soils was developed, based on the results of standard triaxial tests on plane strain compression tests involving primary loading, unloading, and reloading.
Journal ArticleDOI
Engineering geology of Norwegian normally consolidated marine clays as related to settlements of buildings
TL;DR: In this article, a review of the various geological processes which can take place with time in the Norwegian normally-consolidated marine clays, and which will lead to changes of the geotechnical properties.
Journal ArticleDOI
Yielding of Clays in States Wetter than Critical
TL;DR: In this article, a new energy equation is proposed, well supported by experimental evidence, from which a stress-strain relationship is developed for virgin and lightly overconsolidated clays.
Journal ArticleDOI
New Design Procedure for Stability of Soft Clays
Charles C. Ladd,Roger Foott +1 more
TL;DR: In this paper, a new method of selecting design shear strengths for soft clay foundations is presented which avoids much of the empiricism of the present methods and is called SHANSEP.
Journal ArticleDOI
General stress-strain-time function for soils
Awtar Singh,James K. Mitchell +1 more
TL;DR: In this paper, the authors show that there exist linear relationships between logarithm of strain rate and time for a given stress, and between the two at any given time, provided the creep stress level is between the practical limits of about 30% to 90% of the initial soil strength.