Abstract
Time-dependent creep effects can play an important role in the stress distributions and deformations of foundations. Using a phenomenological model, the analysis of undrained creep behaviour has been introduced into an elasto-plastic finite element programme. The creep behaviour of a strip load on a finite layer of soil has been illustrated and a study has been made of the effects of small changes in the values of the creep parameters on the overall analysis of creep deformation. Time dependent creep deformations of a strip load are also compared with those occurring due to consolidation.
The treatment of creep behaviour has been restricted to the modelling of deviatoric creep. When comparing creep effects on different clays, the shape of the yield surface is an important consideration. Sensitivity analyses on the creep parameters revealed a necessity for their accurate evaluation. Small variations in these parameters caused correspondingly large variations in predicted settlements. The inclusion of creep behaviour in a consolidation and creep analysis resulted in a marked increase in settlements, creep settlements causing have at points distant from the loading. Consolidation and creep settlements have opposite effects on horizontal displacements below the edge of a strip load.
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Abbreviations
- a:
-
semi-width of strip foundation
- c:
-
coefficient of consolidation (two dimensional)
- m:
-
slope of the logarithm of strain rate versus logarithm of time
- p′:
-
effective mean normal stress
- q′:
-
invariant shear stress
- p′c :
-
preconsolidation pressure
- q′f :
-
invariant shear stress at the point of critical states
- t:
-
time
- t1 :
-
unit time
- Δt:
-
time step size
- A:
-
strain rate at time t1 and D=0 (projected value)
- D:
-
deviator stress
- \(\bar D\) :
-
ratio of deviator stress to deviator stress at failure
- E:
-
Young's Modulus
- Ko :
-
coefficient of earth pressure at rest
- M:
-
slope of the projection of the critical state line in q′, p′ space
- N:
-
specific volume on normal consolidation line for unit mean normal effective stress
- α:
-
value of the slope of the linear portion of a plot of logarithm of strain rate versus deviator stress
- \(\bar \alpha\) :
-
αqf
- δij :
-
Kronecker delta
- ε:
-
direct strain
- εc :
-
creep strain
- \(\dot \varepsilon _{ij}^c\) :
-
creep strain rate tensor
- k:
-
swelling index
- λ:
-
compression index
- ν:
-
Poisson's ratio
- σx,y,z :
-
direct stresses
- σij :
-
stress tensor
- Γ:
-
specific volume on the critical state line for unit mean normal effective stress
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© 1988 Springer-Verlag
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Hyde, A.F.L., Burke, J.J. (1988). Undrained creep deformation of a strip load on clay. In: Cristescu, N., Ene, H.I. (eds) Rock and Soil Rheology. Lecture Notes in Earth Sciences, vol 14. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010083
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DOI: https://doi.org/10.1007/BFb0010083
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Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-18841-4
Online ISBN: 978-3-540-38834-0
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