Effect of drainage properties on seepage behavior of earth fill dams

Çalamak, Melih
Bingöl, Ahsen
Yanmaz, Ali Melih
Earth-fill dams should be designed in such a way that excessive pore water pressures and seepage are controlled for attaining the desired safety level. This type of dams can be supplemented by some drainage facilities, such as blanket and chimney drains, which are commonly composed of graded soils. The key issue in designing a drainage facility is to promote the effectiveness of the system in reducing the pore water pressures and the seepage quantity. The performance of the drainage facility is based on its geometrical and material properties. This study investigates the suitability and the effectiveness of blanket and chimney drains in earth-fill dams for various properties of the drainage system. The steady-state seepage analyses are conducted for a homogeneous dam with a blanket drain. In the analyses, the thickness and the length of the blanket drain are varied to assess the performance of the facility. The pore water pressures at the critical points of the dam body and the seepage rates are obtained for various cases. The results showed that the length of the blanket drain affect the performance of the system and the seepage behavior of the dam. Also, recommendations are made on assessing the performance of chimney drains.
Citation Formats
M. Çalamak, A. Bingöl, and A. M. Yanmaz, “Effect of drainage properties on seepage behavior of earth fill dams,” presented at the 12th International Congress on Advances in Civil Engineering, İstanbul, 21 - 23 Eylül 2016, 2016, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/70745.