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Experimental and numerical analysis for earth-fill dam seepage


Citation

Al-Janabi, Ahmed Mohammed Sami and Ghazali, Abdul Halim and Ghazaw, Yousry Mahmoud and Afan, Haitham Abdulmohsin and Al-Ansari, Nadhir and Yaseen, Zaher Mundher (2020) Experimental and numerical analysis for earth-fill dam seepage. Sustainability, 12 (6). art. no. 2490. pp. 1-14. ISSN 2071-1050

Abstract

Earth-fill dams are the most common types of dam and the most economical choice. However, they are more vulnerable to internal erosion and piping due to seepage problems that are the main causes of dam failure. In this study, the seepage through earth-fill dams was investigated using physical, mathematical, and numerical models. Results from the three methods revealed that both mathematical calculations using L. Casagrande solutions and the SEEP/W numerical model have a plotted seepage line compatible with the observed seepage line in the physical model. However, when the seepage flow intersected the downstream slope and when piping took place, the use of SEEP/W to calculate the flow rate became useless as it was unable to calculate the volume of water flow in pipes. This was revealed by the big difference in results between physical and numerical models in the first physical model, while the results were compatible in the second physical model when the seepage line stayed within the body of the dam and low compacted soil was adopted. Seepage analysis for seven different configurations of an earth-fill dam was conducted using the SEEP/W model at normal and maximum water levels to find the most appropriate configuration among them. The seven dam configurations consisted of four homogenous dams and three zoned dams. Seepage analysis revealed that if sufficient quantity of silty sand soil is available around the proposed dam location, a homogenous earth-fill dam with a medium drain length of 0.5 m thickness is the best design configuration. Otherwise, a zoned earth-fill dam with a central core and 1:0.5 Horizontal to Vertical ratio (H:V) is preferred.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.3390/su12062490
Publisher: MDPI
Keywords: Seepage; Earth-fill dam; Experimental analysis; Numerical analysis; SEEP/W model; Dam safety and sustainability
Depositing User: Nabilah Mustapa
Date Deposited: 14 Apr 2020 13:57
Last Modified: 14 Apr 2020 13:57
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/su12062490
URI: http://psasir.upm.edu.my/id/eprint/38108
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