266
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
strain behaviour which are strain level dependent.
ined domain
have been shown to be greater than undrained rate effects
.5% per log
rate effects increasing with strain
he small strain response, with the elastic shear
esults and discussion in this
e of use in rate effect analysis and in the associated
ap
the University of
neering and the Institution of
rain rate effects on axial pile capacity.
Proc. 2nd
ng,
107-132.
Ran
Stee
4 CONCLUSIONS
Based on triaxial tests on reconstituted kaolin at strain rates over
more than 5 orders of magnitude, it has been shown that rate
effects have numerous effects on the response of the soil,
ranging from increased deviatoric strength to changes in small
a) Peak strength rate effects in the partially dra
due to time for consolidation.
b) The undrained rate effects observed have been shown to be
higher than those reported by other studies at 22
cycle for peak strength.
c) The importance of strain level in relation to rate effects has
been highlighted, with
when partially drained and reducing with strain when
undrained.
d) The applied strain rate was found to have a significant
impact on t
strain threshold,
γ
EL
, increasing with rate and
G
0
appearing
to reduce with rate.
It is hoped that the r
paper will
b
Figure 5. Graph of shear modulus against shear strain for various
shear strain rates from Hall effect small strain transducer data
plications.
5 ACKNOWLEDGEMENTS
This work is supported by funding from
Dundee Division of Civil Engi
Civil Engineers Research and Development Enabling Fund,
which is gratefully acknowledged.
6 REFERENCES
Bea, R.G. 1982. Soil st
Int. Conf. on Numerical Methods in Offshore E
Brown, M.J. and Hyde, A.F.L. 2008. Rate effects from pile shaft
resistance measurements.
Canadian Geotechnical Journal
, 45 (3),
425-431.
Brown, M. 2009. Recommendations for Statnamic use and
interpretation of piles installed in clay.
Rapid Load Testing on
Piles
, Taylor and Francis, London, 23-36.
Brown, M.J. and Powell, J.J.M. 2013. Comparison of rapid load test
analysis techniques in clay soils.
ASCE Journal of Geotechnical
Figure 6. Graph of G
0
against shear strain rate
and Geoenvironmental Engineering,
Available online 21/03/12.
Chow, S.H. and Airey, D.W. 2011. Rate effects in free falling
penetrometer tests.
Proc. Int. Symp. on Deformation
Characteristics of Geomaterials,
1-3 September, Seoul, 592-599.
Krieg, S. and Goldscheider, M. 1998. Bodenviskotät und ihr Einfluβ auf
das Tragverhalten von Pfählen.
Bautechnik
75, Ernst und Sohn.
Kulhawy, F.H. and Mayne, P.W. 1990. Manual on estimating soil
properties for foundation design.
Report EL-6800
, Electric Power
Research Institute, Palo Alto.
Lehane, B.N., O’Loughlin, C.D., Gaudin, C. and Randolph, M.F. 2009.
Rate effect on penetrometer resistance in kaolin.
Geotechnique
59,
41-52.
Lo Presti, D.C.F., Jamiolkowski, M., Pallara, O. and Cavallaro, A.
1996. Rate and creep effect on the stiffness of soils.
ASCE GSP
61,
166-180.
Mukabi, J.N. and Tatsuoka, F. 1999. Influence of reconsolidation stress
history and strain rate on the behavior of kaolin over a wide range
of strain.
Geotechnics for developing Africa,
Balkema, 365-377.
Quinn, T.A.C. and Brown, M.J. 2011. Effect of strain rate on
isotropically consolidated kaolin over a wide range of strain rates in
the triaxial apparatus.
Proc. Int. Symp. on Deformation
Characteristics of Geomaterials
, 1-3 September, Seoul, 607-613.
dolph, M.F. and Hope, S. 2004. Effect of cone velocity on cone
resistance and excess pore pressures.
Proc. Int. Symp. Eng. Practice
Figure 7. Graph of elastic shear strain threshold against shear strain
rate
and Performance of Soft Deposits
, 147-152.
Rowe, P.W. and Barden, L. 1964. Importance of free ends in triaxial
testing.
ASCE journal of the soil mechanics and foundations
division
90 (SM1), 1-27.
Shibuya, S., Mitachi, T., Hosomi, A. and Hwang, S.C. 1996. Strain rate
effects on stress-strain behavior as observed in monotonic and
cyclic triaxial tests.
ASCE GSP: Measuring and modelling time
dependent soil behavior
61, 214-227.
nfelt, J.S. 1993. Sliding resistance for foundations on clay till.
Predictive soil mechanics
, Thomas Telford, London, 664-684.
