Enerjisa

Ankara, Turkey
Ankara, Turkey
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Haselsteiner R.,Bjornsen Consulting Engineers Koblenz Germany | Pamuk R.,EnerjiSA | Ersoy B.,Bjornsen Consulting Engineers Koblenz Germany
Geotechnik | Year: 2017

The stress-dependent shear strength behaviour of rockfill is frequently estimated by simple shear strength parameter. A linear shear relation between vertical and shear stresses is almost always applied. However, the actual shear strength behaviour of rockfill differs from this theoretical line. A curve is formed which indicates that strong shear strength at low stresses gradually decreases with increasing stress. The shear strength behaviour is influenced by many aspects, such as grain size distribution, compressive strength of the original rock, saturation, stress conditions, grain shape, etc. Reliable large-scale shear tests are not usually available and a realistic non-linear shear strength function has to be estimated using analytical approaches. Only rarely are case studies available for rockfill dams under dynamic loads induced by earthquakes. However, it is assumed that typical rockfill materials will resist dynamic loads. © 2017 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.


Haselsteiner R.,Enerjisa | Kaytan E.,Enerjisa | Pamuk R.,Enerjisa | Ceri V.,Enerjisa
International Journal on Hydropower and Dams | Year: 2012

The main dam in the Arkun project is a concrete face sand-gravel fill dam (CFSGD). As sand-gravel fill materials, which are not free draining, were used for the major part of the dam body, the owner investigated the seepage behaviour of the dam in detail and considered extreme load cases, which are not usually part of standard dam analyses. The seepage analysis focused on conditions where the cut-off wall shows leakage and/or the face slab suffers from cracking. A simple modelling method determining the steady-state conditions and considering saturated material properties was considered to be sufficient in consideration of the inaccuracy in predicting the location and type of potential leakage. It was proven that the seepage control design of the dam is able to withstand hypothetical extreme load cases, for which the first barrier suffers total failure.

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