Abstract
One of the most important issues in earth dams is the control rate of seepage from the foundation and dam bodies. Due to the site of the dams, to increase the creep length and reduce the seepage, there are several methods for sealing the reservoir of dams that construction of the cut-off wall under the clay core of the dams is one of the most effective methods. In this study, the seepage rate and pore water pressure of the Eyvashan earth dam, comparison of instrument results with the results of numerical analysis and, finally, the performance of the cut-off wall are investigated. According to the results of instrumental and numerical analysis, the maximum seepage rate in full reservoir conditions is equal to 831,604 m3/year. To fit the data of instrumentation and numerical analysis, multivariate regression was used and the coefficient of determination was used which R2 = 0.9892 and R2 = 0.9834, respectively, were obtained for seepage and pore water pressure. Very good agreement between the results of the observed data and the predicted data indicates the proper behavior of the dam in terms of pore water pressure. Also, due to the results of numerical simulation and instrumentation, the pore water pressure in the downstream part of the cut-off wall is suddenly dropped, which indicates the correct operation of the cut-off wall.
Highlights
The piezometric instrument is generally installed in dams to measure the hydraulic pressure to examine dam seepage
The Geostudio software suite was used to determine the seepage rate of the Eyvashan Dam using the results of instrument reading and comparing it with the results of the numerical analysis
For analysis of the seepage from the body and foundation of the Eyvashan earth dam and to achieve acceptable results and comparing better seepage, six different levels of water were used for analysis by software and in steady state, and the results obtained after the impact of the lake width compared with actual data.The results of the seepage analysis are shown in Fig. 11 in 1812, 1820, 1830, 1840, 1850, and 1861.20 levels
Summary
The piezometric instrument is generally installed in dams to measure the hydraulic pressure to examine dam seepage. Clough et al were the first researchers who utilized finite element method in predicting the behavior of an earth dam in 1967. Water Engineering, and Hydraulic Structures, Department of Civil Engineering, Faculty of Engineering, University of Ayatollah Ozma Borujerdi, Borujerd, Iran. Water Engineering and Hydraulic Structure, Department of Civil Engineering, Faculty of Engineering, University of Ayatollah Ozma Borujerdi, Borujerd, Iran computers, more complex models are developed to represent the stress-strain behavior of materials and used in the finite element analysis such as the non-linear hyperbolic model developed by Duncan and Chang, in (1970) and application of this procedure to simulate wetting effects described by Nobari and Duncan (1972). Concrete cutoff walls can be deformed by unevenly distributed pressures, which form cracks that can lead to seepage of the dam. Updating dam safety and efficiency concerning such concerns are becoming a crucial matter, especially for those structures that have been in operation for several
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