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Mechanical and Hydraulic Behavior of Cut off-Core Connecting Systems in Earth Dams
Zakaria Zoorasna Graduate student, Faculty of Engineering, Tarbiat Moallem University, Tehran, Iran Amir Hamidi Assistant Professor Ali Ghanbari Assistant Professor
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ABSTRACT |
Seepage through foundation of earth dams can be controlled using concrete cut off walls. The increase in hydraulic gradients in connecting zone of cut off wall and core usually results in erosion and water leakage. Also the difference between stiffness of clayey core and concrete cut off wall results in stress concentration and increase in deformations in connecting zone. As a result, connecting systems are usually used between cut off wall and core to reduce the hydraulic gradients and stress concentration. In the present research, Karkheh storage dam in Iran is considered as the case study. Seepage and stress-strain analysis are conducted to investigate the effect of different connection systems on the maximum gradient and stress concentration in connecting zone. In this regard, the most appropriate systems with the most effective characteristics and suitability in construction are recommended.
Keywords: Cut off wall; connecting system, hydraulic gradient, stress-strain distribution, Karkheh storage dam.
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