Error study of Westergaard's approximation in seismic analysis of high concrete-faced rockfill dams based on SBFEM

The error of dynamic stress in slabs of high concrete-faced rockfill dam (CFRD) caused by the Westergaard simplified hydrodynamic pressure method, which is broadly used at present, and the mechanism of the error generation are analysed. The accurate SBFEM hydrodynamic pressure method is also employe...

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Bibliographic Details
Published in:Soil dynamics and earthquake engineering (1984) 2017-03, Vol.94, p.88-91
Main Authors: Xu, He, Zou, Degao, Kong, Xianjing, Su, Xiaohui
Format: Article
Language:English
Subjects:
CFRD
Concrete dams
Dams
Dynamic stress in face slabs
Error analysis
Finite element method
Hydrodynamic pressure
Pressure
Rockfill dams
SBFEM
Seismic analysis
Seismic engineering
Slabs
Stress
Westergaard
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Summary:The error of dynamic stress in slabs of high concrete-faced rockfill dam (CFRD) caused by the Westergaard simplified hydrodynamic pressure method, which is broadly used at present, and the mechanism of the error generation are analysed. The accurate SBFEM hydrodynamic pressure method is also employed for providing comparison benchmark. In this study, a 3D FEM dynamic analysis of a 300m CFRD is conducted under seismic loading in different directions. The results indicate that the Westergaard method produces large errors in the dynamic stress in face slabs along the slope direction. It is necessary to compute the hydrodynamic pressure by the accurate SBFEM in the CFRD-reservoir dynamic interaction analysis. •The error mechanism of the Westergaard method is investigated based on SBFEM.•The error of slab stress mainly roots in the tangential force and frictional force.•It is necessary to compute hydrodynamic pressure by a accurate method for CFRD.
ISSN:0267-7261
1879-341X
DOI:10.1016/j.soildyn.2017.01.006