308
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
4. REFERENCES
0
1
2
3
4
5
6
7
8
Axial Strain (%)
-2.00
-1.60
-1.20
-0.80
-0.40
0.00
q/p
0
2
4
6
8
10
12
14
Axial Strain (%)
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
u/p
o
o
Ae=0.01
Ae=0.02
Ae=0.04
Ae=0.05
Ae=0.1
Experimental
Results
Dafalias, Y.F., and Herrmann, L.R., (1982), “Bounding
Surface Formulation of Soil Plasticity”, Soil
Mechanics -Transient and Cyclic Loads, G.N. Pande
and O. C. Zienkiewicz, Eds., John Wiley and Sons,
253.
Dafalias, Y.F., and Herrmann, L.R., (1986), “Bounding
Surface Plasticity II: Application to Isotropic Cohesive
Soils”, ASCE Vol. 112, No. 12, December, pp.1263-
1291.
al-Damluji, O.F., al-Shakarchi, Y.J. and al-Busoda, B.S.,
"Static and Dynamic Non-Linear Behaviour by the
Bounding Surface Plasticity Model for Iraqi Soil", Al-
Handassa, Engineering Journal, College of
Engineering, University of Baghdad, Volume 11, No.
4, Pp 641-654, December 2005.
Figure (10) Calibration of parameter A
e
for Baghdad brown
silty clay (BBSC) soil
Table 4 outlines the full set of parameters obtained from the
testing program on the extracted samples from the central
Baghdad area soil after conducting the necessary
calibration procedures outlined in reference (4.2).
Table (4) Complete set of obtained input parameters of
Bounding Surface Plasticity Model for Baghdad brown
silty clay (BBSC) soil
Parameter
Value
Parameter
Value
0.064
R
e
/R
c
0.85
0.017
A
e
/A
c
0.80
M
c
1.2
C
0.0
M
e
/M
c
0.676
S
p
1.0
v
0.4
m
0.02
R
c
2.7
h
e
/h
c
0.5
A
c
0.05
h
c
2.0
T
0.1
h
o
1.5
2. CONCLUSIONS
A set of Bounding Surface Plasticity Model parameters are
established from high quality comprehensive site
investigation and laboratory testing programs. The
parameters presented in Table 4 are further successfully
used in prediction/observation studies on foundation
problems in the central Baghdad city area (4.3).
3. ACKNOWLEDGEMENTS
The authors wish to thank
the Directorate of the National
Center for Construction Laboratories (NCCL) of Iraq for
supporting this research work.
