Investigating reduction of uplift forces by longitudinal drains with underlined canals

Salmasi, Farzin; Khatibi, Rahman; Nourani, Bahram

doi:10.1080/09715010.2017.1350605

Cited by 12 publications

(4 citation statements)

References 11 publications

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“…However, these structures face several challenges, such as seepage, piping, uplift, and natural disasters such as flash floods and earthquakes, which can lead to instability and failure, causing significant economic and social impacts. To mitigate the challenges and impacts, various measures are utilized, including the use of cutoff walls and drainage systems [1][2][3][4]. Seepage occurs beneath the foundation of hydraulic structures constructed on permeable foundations due to the difference in water levels upstream and downstream.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Cutoff Wall Performance Beneath Water Structures by Feed-Forward Neural Network (FFNN)

Alrowais,

Alwushayh,

Bashir

et al. 2023

Water

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Cutoff walls are widely used to limit seepage, piping, and the uplift under hydraulic structures. Therefore, this study focused on a numerical investigation of the hydraulic performance of cutoff walls beneath hydraulic structures during both static and dynamic conditions, considering location and inclination angle influences. The results confirmed that placing the cutoff wall at the upstream heel was more effective in reducing uplift pressure compared to other placements during static conditions. The inclination angles for the different placements of the cutoff wall had a significant impact on the total uplift pressure, exit hydraulic gradient, and seepage discharge during both static and dynamic states. The earthquakes had a noticeable effect on uplift pressure, seepage discharge, and exit hydraulic gradient. During static conditions, the inclination angle of 90° was the most effective angle for decreasing seepage discharge, irrespective of the cutoff wall position. During an earthquake, the seepage discharge values were high regardless of the inclination angle. In the case of placing a cutoff wall at the upstream heel, the maximum seepage discharge value occurred at an inclination angle of 45°. This study provided insights into the behavior of cutoff walls under different conditions and can inform the design and construction of such structures for effective seepage control. The experimental feed-forward neural network (FFNN) was also successfully built. According to the following criteria (uplift pressure, seepage, and exit hydraulic gradient), the hydraulic performance of cutoff walls beneath hydraulic structures under static conditions can be examined. The FFNN can make predictions with root mean square errors (RMSE) of 0.0697, 0.0021, and 0.0059, respectively, and R2 values of 1.00, 0.9994, and 0.9997.

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Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Cutoff Wall Performance Beneath Water Structures by Feed-Forward Neural Network (FFNN)

Alrowais,

Alwushayh,

Bashir

et al. 2023

Water

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“…The results indicated that uplift pressure values were under the condition of fluctuating groundwater levels, and the maximum hydraulic gradient occurred at the corner of the canal bed. Salmasi et al [24] investigated a drainage system (drain pipes under the canal bed) to reduce uplift forces and to increase canal stability against fluctuating groundwater levels.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Effects of Irrigation Canals Rehabilitation on the Land and Crop Yields, a Case Study: The Nile Delta, Egypt

Abd-Elziz

Zeleňáková

Kršák

et al. 2022

Water

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Shortage of surface water is considered an international problem that has even extended to countries that have rivers, in particular countries sharing the same river basins and downstream countries, such as Egypt. This issue requires intensive management of available water resources. Irrigation Canals Rehabilitation (ICR) has become essential to protect surface water in irrigation canals from losses due to seepage. Egypt is one of the countries that has started using this technique. This paper aims to evaluate the impact of ICR using concrete on the land and on crop yields. The SEEP/W model is used in the current study to estimate changes in the groundwater table and moisture in the root zone. Three cases studies have been simulated and compared including unlined, lined, and lined canals with a drainage pipe. The methodology is applied to three canals in the Nile Delta: Sero, Dafan, and New-Aslogy. The results demonstrate that ICR has decreased the losses from canals which resulted in lowering the groundwater, where the case of lining gave a higher reduction than the case of lining with a drainage pipe. In addition, the water table underneath the embankment was lowered. Decreasing the groundwater table could help to protect the land from logging and increase crop yields, but it may reduce the recharging of groundwater aquifers. Such a study is highly recommended in arid regions to decrease water losses where many countries are suffering from water shortage.

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“…They found that the application of drain pipes with granular filter envelope can reduce uplift force significantly and this is a positive effect. Another study about the application of drain pipes under the canal bed was carried out by Salmasi, Khatibi, and Nourani (2017). They investigated the reduction of uplift forces by longitudinal drains with underlined canals.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on geometric configurations affecting seepage from unlined earthen channels and the comparison with field measurements

Asl

Salmasi

Arvanaghi

2020

Engineering Applications of Computational Fluid Mechanics

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In this study, a numerical simulation is applied to investigate the effective factors on the seepage from the earthen channels. To authenticate the information at hand, some of the earthen channels in the Zayandeh-Rud irrigation network in Iran and Gediz watershed in Turkey were studied. 246 numerical models, including different sections of trapezoidal, rectangular and triangular earthen channels, were performed using the finite elements method (FEM). The results showed that, for a numerical simulation, a width of 15 times wider than the top width of the water surface in the channel would be required for the modelling of the left and right lateral boundaries. The comparison of the seepage with empirical relationships showed that the empirical relationships have too much error in the seepage estimation, however, Moritz's relation with the coefficient of determination (R2) of 0.373 was better than the others. The linear and nonlinear multivariate regression relationships provide a suitable match for the seepage discharge estimation. The wetted perimeter has been distinguished as an effective parameter in the seepage from the channels, yet the channels side slope has a low impact on the seepage.

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Investigating reduction of uplift forces by longitudinal drains with underlined canals

Cited by 12 publications

References 11 publications

Modeling and Analysis of Cutoff Wall Performance Beneath Water Structures by Feed-Forward Neural Network (FFNN)

Modeling and Analysis of Cutoff Wall Performance Beneath Water Structures by Feed-Forward Neural Network (FFNN)

Spatial and Temporal Effects of Irrigation Canals Rehabilitation on the Land and Crop Yields, a Case Study: The Nile Delta, Egypt

Numerical investigation on geometric configurations affecting seepage from unlined earthen channels and the comparison with field measurements

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