Dynamic risk assessment of slope stability of homogeneous earth-rock dam under action of multiple hazards

Su, Zhengyang; Zhang, Kai; Liu, Chengdong

doi:10.1177/00375497211073772

Cited by 8 publications

(5 citation statements)

References 30 publications

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“…Because the calculated value of the safety factor was more than the permitted amount, the dam was safe from internal erosion and slope failure under static conditions. Su et al (2022) [6] utilized the Monte Carlo method, the dynamical stability of the earth-rock dam was examined while taking into account the spatial variability of the soil beneath the dam and the coupling effect of the seepage field, stress field, and other hazards. Engineering of early warning measures is suggested by the revelation of the impact of numerous disaster on the stability of the dam.…”

Section: Previous Workmentioning

confidence: 99%

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Storage Earth Dam Failure due to Liquefaction Caused by Earthquakes

Kiraa,

Zeidan,

Nasr

et al. 2023

TOCIEJ

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Aims: We are researching causes and criteria for the liquefaction dam failure by analyzing the safety of the dam under static and dynamic loads against shear failure using the finite element technique, which is used to simulate stability assessment for selected earth dams under different loading conditions. Background: Storage Massive earth dams are vulnerable to collapse during earthquakes, which can have severe effects ranging from direct human casualties to indirect economic losses. How seismically fragile earth dams are and what issues may arise from a failure depend on how they respond to earthquakes. Slope failure, piping, displacement, and/or settlement are examples of seismic responses that are caused by weak soil and/or the liquefaction of loose sands. Earth dam failure can be caused by a variety of factors, including seepage through the dam body, hydraulic issues, structural instability, and liquefaction failure brought on by earthquakes. Objective: The objective of this study is to find a way to design of earth-fill dams. Methods: The finite element method is a numerical solution. This method is based on a grid pattern (not necessarily rectangular) which divides the flow region into discrete elements and provides N equations with N unknowns. Material properties, such as permeability, are specified for each element, and boundary conditions (heads and flow rates) are set. The finite element method has several advantages over the finite difference method for more complex seepage problems. Results: The Lower San Fernando Dam is dangerous under dynamic loads, and the F.O.S. values for the upstream and downstream directions are 0.264 and 0.183, respectively. 1350 m2 is the Lower San Fernando Dam's liquefaction area. 40.67% of the Lower San Fernando Dam's overall foundation area is represented by that figure. Tapar (India) dam is hazardous due to slope failure under dynamic loads, and the F.O.S. values for the upstream and downstream directions are 0.5 and 0.109, respectively. Tapar Dam in India has a liquefaction area of 457 m2. This amount equals 52.33 percent of the Tapar (India) dam's entire foundation area. The slope failure under dynamic loads and the F.O.S. values of 0.313 and 0.548 for the slopes of the river upstream and downstream of Fatehgadh dam (India), respectively, lead to the conclusion that it is dangerous. 333.5 m2 is the size of the liquefaction area of the Fatehgadh dam in India. The foundation area of the Fatehgadh (India) dam as a whole is represented by that figure at 78.75%. Saluda Dam in Columbia is an unsafe slope failure under dynamic loads, and the F.O.S. values for the upstream and downstream directions are 0.102 and 0.101. Saluda Dam in Columbia has a 32095 m2 liquefaction area. This value represents 32.96% of the Saluda Dam's total foundation area (Columbia). Conclusion: Conclusions state that 32.96% of the minimum liquefaction zone area is what causes liquefaction failure. Under the effect of seismic stresses, a safe design standard for storage earth dams is produced. The evaluation must also take into account the specifications for safety limitations based on global norms, regulations, and codes. examining the dam safety requirements for dynamic loads.

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Section: Previous Workmentioning

confidence: 99%

“…The 1959-built Chang Dam is a multiple-zone earthen dam with a 15.5 m maximum section height and a crest length of 370 m. Fig. (6) and Table 5 show the cross-section of Chang Dam and the material properties of the dam. The bedrock on which the dam is constructed is a thin layer of sandstone.…”

Section: Chang Dammentioning

confidence: 99%

Storage Earth Dam Failure due to Liquefaction Caused by Earthquakes

Kiraa,

Zeidan,

Nasr

et al. 2023

TOCIEJ

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“…Dam safety is affected by a combination of risk factors such as low ood control standards, poor construction quality, aging materials and equipment, and human damage, which can cause serious loss of life and property in the event of a breach Mavhura 2020; Wang et al 2023). In the risk analysis of earthen and rock ll dams, there may be coupling relationships between these in uencing factors, and any one of them may also have a chain reaction with other factors (Su et al 2022;), and their interactions can cause serious damage to the dam system, or even lead to the reoccurrence of such dam failure events as Henan 75.8. Therefore, the establishment of a reliable dam risk analysis model to identify the main in uencing factors and their interactions that lead to dam failure is currently a top priority in dam risk analysis and management (Escuder-Bueno et al2016).…”

Section: Introductionmentioning

confidence: 99%

Dam failure risk analysis of earthen and rockfill dam systems: an approach based on a combination of an Interpreted Structural Model and a Bayesian Network with parameter learning

Li,

Zhang,

Wang

et al. 2023

Preprint

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The risk factors of earthen and rockfill dams during operation are characterized by uncertainty, complexity, interaction, etc. The coupling of risk factors can be more accurately identified in the process of dam risk analysis. To effectively analyze the interactions between the influencing factors within the system, this paper proposes a method for analyzing the risk of earthen and rockfill dam failure based on a combination of the Interpretive Structural Model (ISM) and Bayesian network (BN) model with the parameter learning. Meanwhile, the parameter learning of the BN model using the EM algorithm reduces the subjectivity of expert evaluation. In this paper, we analyzed the interrelationships among accidents by using the ISM method through statistics and analysis of actual accident cases. We established a hierarchical structure diagram including a five-level structure to derive the direct, indirect, and fundamental factors that lead to accidents. The EM algorithm was introduced to learn Bayesian network parameters, and the probability of occurrence of each influencing factor of earthen and rockfill dam failure was obtained through BN inference, diagnosis, and sensitivity analysis. The three most important influencing factors leading to earthen and rockfill dam failure were identified as flood overtopping, insufficient spillway discharge capacity, and damage to the spillway structure. A multi-factor coupling analysis was also conducted on the earthen and rockfill dams, and the results showed that the risk of dam failure was greatly increased as a result of the coupling between the influencing factors. In addition, we also found that management issues play an important role in earthen and rockfill dam failures and are key influencing factors that cannot be ignored. This method can be effectively applied to identify and analyze the influencing factors of earthen and rockfill dam failure in China.

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“…However, the aforementioned studies of deformation mechanisms mainly rely on historical retrospective analyses based on time series deformation monitoring combined with field investigations, neglecting another critical issue that affects the deformation and stability of earth-rock dams, namely, the seepage field [4,28]. The earth-rock dams are usually filled with high-permeability dam shell materials and high water-resistance core walls [4,29].…”

Section: Introductionmentioning

confidence: 99%

Investigating Deformation Mechanism of Earth-Rock Dams with InSaR and Numerical Simulation: Application to Liuduzhai Reservoir Dam, China

Liu,

Hu,

Liu

et al. 2023

Remote Sensing

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Ground deformation is the direct manifestation of the earth-rock dam's hazard potential. Therefore, it is essential to monitor deformation for dam warning and security evaluation. The Liuduzhai Dam, a clay-core dam of a large reservoir in China, was reinforced with plastic concrete cut-off walls between 13 January 2009 and 29 May 2010, as it was subject to leakage and deformation. However, the deformation development and the mechanism of the dam are still unclear. In this study, the deformation fields before and after the reinforcement of the Liuduzhai Dam were yielded by using the Interferometric Synthetic Aperture Radar (InSAR) technique. Furthermore, a numerical simulation method was employed to obtain the dynamic seepage field of the dam during the InSAR observation period. The results indicated that the average deformation velocity and maximum deformation velocity are −11.7 mm/yr and −22.5 mm/yr, respectively, and the cumulative displacement exceeds 100 mm, which shows typical continuous growth characteristics in a time series. In contrast, the dam deformation tended to be stable after reinforcement, with the average deformation velocity and maximum deformation velocity being −0.4 mm/yr and −1.2 mm/yr, respectively, behaving as cyclical deformation time series. According to the results of InSAR and seepage analysis, it is shown that: (1) dynamic seepage was the main mechanism controlling dam deformation prior to reinforcement; (2) the concentrated load caused by construction and the rapid dissipation of pore water pressure caused by the sudden drop of the infiltration line were the reasons for the acceleration of deformation during and after construction; and (3) the plastic concrete cut-off walls effectively reduced the dynamic seepage field, while the water level fluctuations were the main driving factor of elastic deformation of the dam after reinforcement. This study provides a novel approach to investigating the deformation mechanism of earth-rock dams. Furthermore, it has been confirmed that InSAR can identify the seepage deformation of dams by detecting surface movements. It is recommended that InSAR deformation monitoring should be incorporated into future dam safety programs to provide detailed deformation signals. By analyzing the temporal and spatial characteristics of the deformation signal, we can identify areas where dam performance has degraded. This crucial information aids in conducting a comprehensive dam safety assessment.

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Dynamic risk assessment of slope stability of homogeneous earth-rock dam under action of multiple hazards

Cited by 8 publications

References 30 publications

Storage Earth Dam Failure due to Liquefaction Caused by Earthquakes

Storage Earth Dam Failure due to Liquefaction Caused by Earthquakes

Dam failure risk analysis of earthen and rockfill dam systems: an approach based on a combination of an Interpreted Structural Model and a Bayesian Network with parameter learning

Investigating Deformation Mechanism of Earth-Rock Dams with InSaR and Numerical Simulation: Application to Liuduzhai Reservoir Dam, China

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