Cellular automata model-based numerical analysis for breaching process of embankment dam

Huaizhi Su (), Cheng Qian, Zhiping Wen and Lifu Yang
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Huaizhi Su: Hohai University
Cheng Qian: National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety
Zhiping Wen: Nanjing Institute of Technology
Lifu Yang: Hohai University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2020, vol. 103, issue 1, No 12, 282 pages

Abstract: Abstract It is of great significance to study the process and cause of embankment dam breach in order to ensure the dam safety. In this paper, the overtopping failure mode of embankment dam is selected as the research object, and the cellular automata (CA) method is introduced to explore the development law and influencing factors of the overtopping failure mode. Based on the physical and mechanical characteristics of embankment dam and the energy evolution law of the dam soil failure process, this paper discusses the realization method of CA for simulations of dam body heterogeneity, soil anisotropy, stress environment, etc., and proposes the determination method of cellular failure threshold, energy dissipation rate and energy transfer coefficient. Afterward, the loading mode of the CA model is determined based on the relationship between generalized energy and force deformation of the dam soil. Then, energy criterion for dam erosion failure and mechanical criterion of breach slope failure are put forward. Finally, the CA model is applied to a practical project so as to analyze the development and cause for scour depth and width of the overtopping failure breach, and the influence of overtopping water level and downstream slope ratio on the development of breach.

Keywords: Embankment dam; Overtopping; Dam failure criterion; Numerical simulation; Cellular automata (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s11069-020-03986-x

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