Modeling the effect of central impervious core and downstream filter geometry on seepage through earth dams

Kumar, Sushant; Sahu, Anil Kumar; Kumar, Munendra

doi:10.1016/j.asej.2021.05.024

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…Prof. Khassaf and Madhloom (2013) studied a zoned earth dam named Khassa Chai Dam, Iraq stated that adding clay core can reduce seepage and the hydraulic gradient within an earthen dam. Kumar et al (2015) concluded that seepage discharges increased along with increase in dam height, lter length and longitudinal slope. Further the upstream slope, clay core thickness, the viscosity of uid and dam length decrease with decrease in seepage discharge.…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Bentonite-fly-ash Composite Core for Earthen Embankment using Taguchi Coupled Sunflower Optimization Algorithm

Subhadarsini

Giri

Das

2023

Preprint

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A typical earthen embankment is a raised compacted wall-like structure basically consisting of an outer shell to permit seepage of minimum piping, a centrally located core, and a base drainage filter to check the flow of water through it. The earthen embankment needs a centrally stabilized clay core made off locally available puddle clay composite with coarse soil in order to store and divert storm water. In the current work, a compression moulding technique was used employed to build a low-cost composite for clay core using readily available bentonite reinforced with fly-ash. The experimental work initiated with the characterization of the locally collected soil, bentonite and fly-ash along with the micro structural investigation utilizing Scan Electron Microscopy (SEM) and Energy Dispersive X-Ray (EDX). Proctor test has been employed to stabilize clay core composite using different percentage ratios of bentonite and fly-ash according to the Taguchi L9 orthogonal array. The obtained maximum dry density (MDD) and optimum moisture content (OMC) were arranged in the design of the experiment (DOE) to examine the best possible results. The experimental findings from the Taguchi optimization approach determine the optimum values of OMC and MDD. The Analysis of variance (ANOVA) was performed to determine the primary factor influencing the strength of the clay core using signal-to-noise (S/N) ratio. A meta-heuristic method named as Sunflower optimization technique was employed to validate the generated optimum OMC and MDD. Verified OMC and MDD results were corroborated with the impervious core properties of the existing structures.

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Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Bentonite-fly-ash Composite Core for Earthen Embankment using Taguchi Coupled Sunflower Optimization Algorithm

Subhadarsini

Giri

Das

2023

Preprint

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“…In [35], the questions of the influence of unsteady filtration on the slopes of mountains during a drop in water levels in the river were studied. Research works [36][37][38] are devoted to solving non-rocky geotechnical problems, including when there is a large filtration along the slopes of rivers and its influence on their stability. In dissertation work.…”

Section: Introductionmentioning

confidence: 99%

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

2023

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The Republic of Uzbekistan pays great attention to the development and implementation of a program for the development of hydropower based on ensuring the share of hydropower in the energy potential and the integrated development of hydropower potential. Over the last three years, hydropower plants have been built or reconstructed in more than a dozen small and medium-sized earth dams to accomplish this task. Typically, unstable filtration is observed in the body of earth dams because of deviations from the normal filling and emptying of water reservoirs. The main goal of the research is to determine the time to lower the depression surface in the Tupalang earth dam transition zones, which characterizes the intensity of unstable filtration during a smooth and sudden drop in reservoir water level. The calculations were made according to the theoretical dependences of V.P.Nedriga for two cases of smooth and sudden lowering of the water level in the reservoir, starting from the normal backed level (NBL). In the calculations, the values of the main parameters were taken to be the coefficient of water loss of the soil (0.3), the coefficient of filtration of the transition zones (9.5 m/day), and the coefficient of laying the slope of the transition zones (0.2). Calculations showed that the time of lowering the depression surface in the transition zones with a gradual decrease in the water level in the reservoir was 84.1 days, and with an instantaneous decrease in the water level during the operation of a dam with a height of 120 m 3.86 days, and during the operation of a dam with a height of 185 m 6.82 days.

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“…Over time, scholars have explored the consequences arising from different design components, particularly focusing on the central impervious core and toe drain and their impacts on the seepage attributes of earthen dams. A noteworthy illustration comes from the work of Kumar et al [19], who investigated the effects of a central impervious core and drainage arrangement on seepage behaviors within earth dams. From their findings, a consequential observation emerged, wherein these alterations led to a discernible reduction in the phreatic line, illustrating the intricate relationship between the geometrical attributes of dam components and the intricate behavior of seepage within earth dams.…”

Section: Introductionmentioning

confidence: 99%

Delving into Earth Dam Dynamics: Exploring the Impact of Inner Impervious Core and Toe Drain Arrangement on Seepage and Factor of Safety during Rapid Drawdown Scenarios

Utepov,

Mkilima,

Aldungarova

et al. 2023

Infrastructures

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The study examined the intricate relationships between embankment slope configurations, toe drain designs, and drawdown scenarios. It utilized a unique combination of numerical, physical, and mathematical models. The investigation involved 16 numerical models and 8 physical models with distinct characteristics. The research explored the correlations of key parameters: matric suction, horizontal water conductivity, time, and factor of safety. The factor of safety values varied from 0.62 to 1.03 as a result of the different investigated combinations. For instance, a 1:2 embankment slope without a toe drain under instantaneous drawdown led to the factor of safety values ranging from 1.22 to 1.57. Additionally, incorporating elements like a 30 m toe drain and a 1 m per day drawdown rate influenced these values, with extremes recorded from 1.337 to 2.21, shedding light on embankment stability under diverse conditions and configurations. When subjected to a 1 m per day drawdown, water flow rates decreased significantly at the upstream face and increased downstream, accompanied by an increase in water mass flux at the upstream face and a decrease at the downstream toe, suggesting dynamic changes in water behavior in response to drawdown. Moreover, the findings unveiled significant correlations between matric suction and time (correlation coefficient of 0.950) and factor of safety and water conductivity (correlation coefficient of 0.750). Conversely, a distinct negative correlation emerged between matric suction and factor of safety (correlation coefficient of −0.864). The study’s distinctive insights contribute to our understanding of seepage behavior and dam stability across varied scenarios, offering valuable input for resilient dam construction approaches that will ensure the longevity and effectiveness of these essential structures.

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Modeling the effect of central impervious core and downstream filter geometry on seepage through earth dams

Cited by 13 publications

References 21 publications

Parametric Optimization of Bentonite-fly-ash Composite Core for Earthen Embankment using Taguchi Coupled Sunflower Optimization Algorithm

Parametric Optimization of Bentonite-fly-ash Composite Core for Earthen Embankment using Taguchi Coupled Sunflower Optimization Algorithm

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

Delving into Earth Dam Dynamics: Exploring the Impact of Inner Impervious Core and Toe Drain Arrangement on Seepage and Factor of Safety during Rapid Drawdown Scenarios

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