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Abstract Gotvand rock fill dam is being constrcted on Karun river located in Khoozestan province south of Iran. The dam is foung on Aghagari formation which is consisted of mudstone and sandstone layers. These layers are intermittent of weak to medium strength with uniaxial compressive strength 15 and 25 MPa respectibely. Some regional factors as continuous unloading caused by river flood washed off and horizontal tectonic loading have created a local anticline in the foundation of dam. According to previous analyses, results have shown that this folding will continue over the time. In this research effect of the dam weight on time d- dependant deformation of the dam foundation has been studied. Ration of horizontal to vertical stresses (K) was estimated to be 0.4 to 0.7 by in-situ tests, so dam site numerical models were executed (numerical analysis wity the FLAC3D code) with K equal to 0.4,0.55 and 0.7. First, the models were executed statically. Maximun settlement of foundation due to the dam weight was estimated a bout 37cm. Ihen for time dependent analysis, the behavior of rocks is assumed to obeay Maxwell creep viscousplastic rheological model and the models were executed for 100 years equal to the dam life time. The results of numerical analysis show that upward deformations of the foundation with K=0.55 and 0.7 is continuously, even in the central region of dam where the dam weight is maximum. But in the model with K=0.4, in the first 60 years after the construction, creep deformation are downward and after this time, directions of deformation were changed to upward.

Keywords: Gotand dam, creep, Time- Dependent, analysis, Dam foundation, Numerical

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