3304
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
(a)Strain at dam axis direction of face slab of Bakun Dam designed by
deformation coordination method (unit: 10
-4
)
(b)Strain at dam axis direction of face slab of Bakun Dam designed by
empirical method (unit: 10
-4
)
Figure 6 Comparison of strains at dam axis direction of concrete face
slab at water impoundment of Bakun Dam between .empirical method
designed and new deformation coordination concept method designed
4
）
Based on the calculation results and observation data of
Bakun Dam designed by deformation coordination concept and
constructed by MCHJV, it could be shown that the deformation
of dam different zones is coordinated each other and the
deformation of concrete face slab is coordinated synchronously
with deformation of dam body. The maximum settlement
difference of dam body is only 3.18×10
-2
, decreasing 51% as
compared with that designed by empirical method. The
maximum displacement difference at normal direction between
face slab and cushion is only 71.0cm, decreasing 60% as
compared with that designed by empirical method. The
observed maximum compression strain at dam axis direction of
face slab is only 565×10
-6
, decreasing 19% as compared with
that designed by empirical method.
5
）
It could be considered based on Bakun Dam prototype
observation data that the predicted behavior by 3D FEM
analysis could reflect its real performance. This 3D FEM
analysis method is effective and can be used for CFRD
deformation coordination concept design.
4 CONCLUSIONS
The following conclusions could be obtained:
1
）
The reason of the cracking cushion layer, the structural
cracking and squeezed rupture of concrete face slab is that the
deformations of dam different zones are not coordinated each
other and the deformations of face slab are not coordinated
synchronously with the deformations of dam body.
2
）
The deformation safety should be satisfied necessarily
for high CFRDs besides the stability safety and seepage safety
for earth-rockfill dams as usually.
3
）
The deformation safety design method including
deformation coordination standards, judgment criteria and
calculation method is shown to be reasonable and important for
high CFRDs through its application to Bakun Dam.
5. REFERENCES
Li, Neng-hui. 2007.
Recent technology for high concrete face rockfill
dams
, Beijing: China Water Power Press, (in Chinese)
Cooke, J. B. 1984. Progress in rockfill dams,
Journal of Geotechnical
Engineering, ASCE
, 110(10), 1383
–
1414.
Cooke, J. B. 1998. Empirical design of concrete face rockfill dams,
Hydropower & Dam
, (6), 7
–
11.
Li, Neng-hui. 2011. New concept of design for high concrete face
rockfill dams,
Engineering Sciences
, 13(3), 12
–
18.(in Chinese).
Li, Deng-hua, Li, Neng-hui. 2009. Experimental study on mechanical
behavior of interface between soil and concrete slab.
Water
Resources and Power
, 27( 5),114
–
118. (in Chinese)
Li, Neng-hui, Wang, Jun-li, Mi, Zhan-kuan, Li, Deng-hua. 2012.
Connotation of deformation safety of high concrete face rockfill
dams and its application.
Chinese Journal of Geotechnical
Engineering
, 34(2),193-201 (in Chinese)
