Overtopping Risk Analysis of Earth Dams considering Effects of Failure Duration of Release Structures

Liu, Lijun; Wu, Zhenyu

doi:10.1155/2020/3528350

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…Because the differential equations of seepage cannot be solved analytically except in exceptional cases and with elementary boundary conditions, numerical methods for seepage analysis have become widespread in recent years and provide more precise results than other methods. Finite Element Methods, Finite Differences, and Boundary Element Methods are standard numerical methods for solving the flow equations [31,32].…”

Section: Methodsmentioning

confidence: 99%

Reduction of Seepage Risks by Investigation into Different Lengths and Positions for Cutoff Wall and Horizontal Drainage (Case Study: Sattarkhan Dam)

Brontowiyono

Hammid²,

Jebur³

et al. 2022

Advances in Civil Engineering

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Seepage from the earth dam’s body reduces the amount of water in the dam’s reservoir and threatens its stability. In this paper, the earth-type Sattarkhan Dam on the Aharchai River has been investigated. In this regard, the SEEP/W model from the GeoStudio 2018 software suite was used for modeling. This study examines the effects of various lengths and positions of cutoff wall and horizontal drainage on seepage, uplift pressure, and exit gradient. Increasing the length of the cutoff wall reduces seepage in both sections, with a more significant effect on Section 2; it also decreases the uplift pressure and the exit gradient. Changing the position of the cutoff wall has a significant effect on seepage fluctuations in Section 1 but has no effect on seepage in Section 2; in positions 2 to 7, the uplift pressure values are nearly identical, and the exit gradient is most significant at position 1 and least at position 2. Increasing the horizontal drainage’s length increases seepage, reduces uplift pressure, and increases the exit gradient. The closer proximity of the horizontal drainage position to the dam’s core increases seepage and decreases uplift pressure and exit gradient. Finally, it is concluded that the construction of a cutoff wall and horizontal drainage with appropriate lengths and positions reduces risk and improves the stability of earth dams.

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Section: Methodsmentioning

confidence: 99%

Reduction of Seepage Risks by Investigation into Different Lengths and Positions for Cutoff Wall and Horizontal Drainage (Case Study: Sattarkhan Dam)

Brontowiyono

Hammid²,

Jebur³

et al. 2022

Advances in Civil Engineering

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“…In 1991,Canada British Columbia Hydro [2] (BC Hydro) proposed an improved risk assessment method, which analyzes and quantifies the risk of reservoir dams in terms of regulations, public society, and the needs of owners with respect to three aspects: determining the degree of safety of the dam, criteria for judging whether the dam is safe, and the most economical method for strengthening a dam in danger, and the results are consistent with engineering practice. In 1994, the Australian Dams Council issued Guidelines for Risk Assessment, and continuously revised, and a new draft was completed in 2003, which provides a theoretical basis and operational steps for dam safety assessment and is a general framework for dam risk management in Australia, which is at the forefront of the world in terms of construction of regulations and risk management concerning dams [3].Liu and Wu [4] proposed a method to analyze the overtopping risk of earth and rock dams considering the effect of the failure duration of the release structure based on Bayesian networks. The study shows that the proposed method helps to analyze the effect of the possible failure duration of the release structure on the overtopping risk of the dam and helps to prepare the emergency plan.…”

Section: Literature Reviewmentioning

confidence: 99%

Decision-making study on risk evaluation of earth and rock dams based on ANP unascertained measurement theory

Li,

Zhang,

et al. 2023

Nat Hazards

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Earth and rock dams are subject to risks caused by uncertainties during operation and management, and the health condition of earth and rock dams in service must be determined in a timely manner to properly protect them. In order to evaluate the health condition of earth and rock dams easily, quickly, reliably and quantitatively, this paper proposes a health evaluation method based on the ANP unconfirmed measure theory, and gives specific evaluation steps.First, the risk evaluation index system of earth and rock dams was constructed from six aspects: engineering quality, operation and management, diffuse top damage, infiltration damage, destabilization damage, and other factors. Then, the risk value of the evaluation index is determined using the unconfirmed measure model by integrating multiple types of information such as numerical calculation, inspection and inspection, and test and inspection, and the index is weighted using ANP. Finally, a project is used as an arithmetic example to verify the scientific applicability of the method in the risk evaluation of earth and rock dam projects, which provides an important reference for the risk control and management of earth and rock dam projects.

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“…It is necessary to study the influence of cross structures on flood discharge capacity in mountainous areas to provide a scientific reference for flood control. The effect of these structures may be greater in mountainous areas due to factors such as bridge submergence being more common than in flat valleys [18]. A numbers of studies have been conducted to discover the influence of bridges, dams and gates on flood discharge capacity of rivers.…”

Section: Introductionmentioning

confidence: 99%

Influence of Multi-Cross Structures on the Flood Discharge Capacity of Mountain Rivers in the Yellow River Basin

Song

Zhang

et al. 2023

Water

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This study investigates the impact of cross structures on flood occurrences in mountainous rivers. The governing equations of open channel flow were formulated based on the Saint-Venant equations. The open channel was segmented, and a node equation was established at each section’s connection point. An overflow model of bridges and weir dams was also developed. The physical model of the open channel was simplified and modeled using actual building data and model calculation requirements. The study found that the primary impact of weirs and bridges on the open channel was the backwater effect on the water level. The influence of these structures on the water level in the Huang Stream urban section in the Yellow River Basin was assessed under various working conditions. The results showed that deleting the #1 weir could reduce the maximum backwater height by 1.14 m, and deleting the #2 weir could reduce it by 1.09 m. While reducing the weir height significantly decreased the backwater range and height, it did not enhance the river’s flood discharge capacity. The Huang Stream contains 17 bridges, 13 of which could potentially affect flood discharge. The eight flat slab bridges in the submerged outflow state had a significant impact on flood discharge, with a maximum water level change of 0.51 m. Conversely, the three single-hole flat slab bridges in the free outflow state downstream had a negligible impact on flood discharge. The study found that bridges had a greater influence on flood discharge capacity than weirs. This research provides valuable insights for the reconstruction of cross structures in mountainous rivers and for managing flood discharge capacity and flood control.

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Overtopping Risk Analysis of Earth Dams considering Effects of Failure Duration of Release Structures

Cited by 6 publications

References 35 publications

Reduction of Seepage Risks by Investigation into Different Lengths and Positions for Cutoff Wall and Horizontal Drainage (Case Study: Sattarkhan Dam)

Reduction of Seepage Risks by Investigation into Different Lengths and Positions for Cutoff Wall and Horizontal Drainage (Case Study: Sattarkhan Dam)

Decision-making study on risk evaluation of earth and rock dams based on ANP unascertained measurement theory

Influence of Multi-Cross Structures on the Flood Discharge Capacity of Mountain Rivers in the Yellow River Basin

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