A KINEMATIC HARDENING MODEL WITH DEGRADATION OF STRUCTURE – APPLICATION TO SOFT NATURAL CLAYS. B é atrice A Baudet University College London. INTRODUCTION. Natural clays have a different microstructure or structure to that of clays reconstituted in the laboratory.
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Béatrice A Baudet
University College London
INTRODUCTION – APPLICATION TO SOFT NATURAL CLAYS
to that of clays reconstituted in the laboratory.
with plastic strain; this is termed destructuration.
TYPICAL PROBLEMS ASSOCIATED WITH CONSTRUCTION ON SOFT NATURAL CLAYS
Failure of the Carsington dam during
construction due to poor estimation
of strength of the foundation clay
Cracking of roads due to settlement of soft soil foundation
EFFECTS OF STRUCTURE ON THE BEHAVIOUR OF SOFT CLAYS NATURAL CLAYS
SOFT NATURAL CLAYS NATURAL CLAYS
THE S3-SKH MODEL NATURAL CLAYS
with a stable structure (Stallebrass & Taylor, 1997)
SCL NATURAL CLAYS
sensitivity at yield
compression of intact clay
current sensitivity, s
2 s. p
Experimental data (from Allman, 1992) NATURAL CLAYS
v NATURAL CLAYS
CONCLUSIONS NATURAL CLAYS
boundary surface is sufficient to describe the behaviour of
natural soils in triaxial space
parameters to the base model which can be derived from a
single isotropic test
stress space and whether the features of behaviour found in
general stress space can be generated by simply extrapolating
the model from axisymmetric to general space