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Article

Risk Analysis of Instability Failure of Earth–Rock Dams Based on the Fuzzy Set Theory

1
School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China
2
School of Railway Engineering, Zhengzhou Railway Vocational and Technical College, Zhengzhou 450001, China
3
Safety Center for River and Lake Protection, Construction and Operation, Yellow River Conservancy Commission, Zhengzhou 450003, China
4
School of Civil Engineering, Henan University, Zhengzhou 451191, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ramon J. Batalla
Water 2021, 13(21), 3088; https://doi.org/10.3390/w13213088
Received: 12 August 2021 / Revised: 23 October 2021 / Accepted: 26 October 2021 / Published: 3 November 2021
Determining the anti-sliding instability risk of earth–rock dams involves the analysis of complex uncertain factors, which are mostly regarded as random variables in traditional analysis methods. In fact, fuzziness and randomness are two inseparable uncertainty factors influencing the stability of earth–rock dams. Most previous research only focused on the randomness or the fuzziness of individual variables. Moreover, dam systems present a fuzzy transition from a stable state into a failure state. Therefore, both fuzziness and randomness of the influencing factors should be considered in the same framework, where the instability of an earth–rock dam is regarded as a mixed process. In this paper, a fuzzy risk model of instability of earth–rock dams is established by considering the randomness and fuzziness of parameters and the failure criteria comprehensively. We obtained the probability threshold of instability risk of earth–rock dams by Monte-Carlo simulation after the fuzzy parameters were transformed into interval numbers by cut set levels. By applying the proposed model to the instability analysis of the Longxingsi Reservoir, the calculation results showed that the lower limits of risk probability under different cut set levels exceeded the instability risk standard of grade C for earth–rock dams. Compared with the traditional risk determination value, the risk interval obtained with the proposed methods reflects different degrees of dam instability risk and can provide reference for dam structure safety assessment and management. View Full-Text
Keywords: earth–rock dam; instability failure; fuzzy set theory; fuzzy risk; Monte-Carlo method earth–rock dam; instability failure; fuzzy set theory; fuzzy risk; Monte-Carlo method
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MDPI and ACS Style

Zhang, H.; Li, Z.; Li, W.; Song, Z.; Ge, W.; Han, R.; Wang, T. Risk Analysis of Instability Failure of Earth–Rock Dams Based on the Fuzzy Set Theory. Water 2021, 13, 3088. https://doi.org/10.3390/w13213088

AMA Style

Zhang H, Li Z, Li W, Song Z, Ge W, Han R, Wang T. Risk Analysis of Instability Failure of Earth–Rock Dams Based on the Fuzzy Set Theory. Water. 2021; 13(21):3088. https://doi.org/10.3390/w13213088

Chicago/Turabian Style

Zhang, Hexiang, Zongkun Li, Wei Li, Ziyuan Song, Wei Ge, Ruifang Han, and Te Wang. 2021. "Risk Analysis of Instability Failure of Earth–Rock Dams Based on the Fuzzy Set Theory" Water 13, no. 21: 3088. https://doi.org/10.3390/w13213088

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