Clayton, C.R.I. and Heymann, G.
Soil stiffness in stress paths relevant to diaphragm walls in clay.
Powrie, W., Pantelidou, H. & Stallebrass, E. (1998). Geotechnique 48, No. 4, 483 ± 494 Thomas Telford 2pp.
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The authors report an extensive triaxial testing programme
on reconstituted kaolin to investigate the in¯uence of stress
paths on the stiffness of soil elements in the vicinity of
diaphragm walls. They state that `the effect of the recent stress
history of the soil on its stress±strain response is now well
In support of this statement, they present data that appear to
show that the stiffness of their kaolin, when tested under triaxial
conditions, is strongly in¯uenced by a change in stress path
direction. Fig. 8 of their paper shows that a specimen that
experienced a reversal in total stress path direction (1808) has a
normalised stiffness 4±8 times higher than that of specimens
that undergo no reversal in total stress path direction. This
®nding is in broad agreement with results from reconstituted
London Clay reported by Atkinson et al. (1990), who showed
an increase in stiffness of an order of magnitude when comparing
the stiffness after a reversal in effective stress path direction
with no change in direction.
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