Deformation and stress of embankment dam for both self-weight and water load effects using FLAC 3D.

Alex Alebachew


The deformation and stress analysis is carried out using step construction approach for both self- weight and water load effects by using a software called FLAC 3D.


The software to be used for the modelling purpose is known as FLAC3D. The software is very powerful and can carry a wide variety of problems ranging from stress-deformation to heat transfer analysis. Mohr- Columb constitutive model is used for the analysis purpose since large deformations are expected. Lateral and vertical deformation and stress values are determined at center clay of core , upstream, downstream, and 53m section  of the dam. The Governing deformation and stresses are assessed entirely on the dam body. For the entire dam the m a x i m u m d i s p l a c e m e n t due to water load occurs around t h e same location as the self-weight only (i.e. 73.87m) and has a magnitude of 1.5621m which is a little bit larger than 1 . 5 1 7 1 m ( due to s e l f -w e i g h t o n l y ).

The major aspect in the dam body in general is the reduction of the negative displacement at upstream side and the increase in the positive displacement in the downstream side due to the push imposed by the water upstream of the dam.

The vertical displacement of the dam in all cases of this study is increased in the case of impounding reservoir load additionally considered over self-weight. Maximum  vertical  stress  is occurred at   the bottom of the dam on both sides of the filter and transition zones. Both minimum vertical and horizontal stress occurred at the crest, toe and heel of the dam but the magnitude is different.


Key word; Embankment dam, deformation, stress, self-weight, water load

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ISSN : 2251-1563