Overtopping Failure of Moraine Dams under Action of Earthquake-Induced Resonant Water Surges

ZHANG Cong; YAO Lingkan; HUANG Yidan; SU Yue

doi:10.3969/j.issn.0258-2724.20190454

Volume 56 Issue 3

Jun. 2021

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Journal of Southwest Jiaotong University > 2021 > 56(3): 564-571.

ZHANG Cong, YAO Lingkan, HUANG Yidan, SU Yue. Overtopping Failure of Moraine Dams under Action of Earthquake-Induced Resonant Water Surges[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 564-571. doi: 10.3969/j.issn.0258-2724.20190454

Citation:

ZHANG Cong, YAO Lingkan, HUANG Yidan, SU Yue. Overtopping Failure of Moraine Dams under Action of Earthquake-Induced Resonant Water Surges[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 564-571. doi: 10.3969/j.issn.0258-2724.20190454

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Overtopping Failure of Moraine Dams under Action of Earthquake-Induced Resonant Water Surges

doi: 10.3969/j.issn.0258-2724.20190454

ZHANG Cong^1
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YAO Lingkan^{1,2,3
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HUANG Yidan^1,2,
SU Yue¹

Received Date: 17 May 2019
Rev Recd Date: 03 Dec 2019

Available Online: 11 Dec 2019

Publish Date: 15 Jun 2021

Abstract

Abstract

Shaking table model experiments were designed to study the overtopping failure mechanism of moraine dams under action of earthquake-induced resonant water surges (ERWSs). Firstly, movements of earthquake-triggered surges under resonant and non-resonant conditions were compared to examine the main influencing factors of maximum height of ERWSs, and a prediction equation for the maximum height was proposed through dimensional analysis. Then, based on the critical water head condition for coarse particle initiation and the critical water volume condition for sediment transportation in dam break, critical conditions of overtopping failure for barrier dams under water surge actions were established and a risk assessment procedure was developed. Finally, taking the 34 small-scale moraine-dammed lakes located in the Parlung Zangbo River basin as examples, the operation of the proposed procedure was demonstrated. Results show that compared with non-resonant surges, ERWSs have greater amplitudes and a much slower process of attenuation with time, and a steady state with continuous large-amplitude wave motion exists in the time history of the resonant surge. When the seismic resonance effect is considered, the number of dangerous moraine-dammed lakes in the Parlung Zangbo River basin increases from 3 to 11, and the distribution extends to the areas with smaller peak ground acceleration (PGA). The results provide a scientific basis for seismic risk assessment of barrier lakes along the Sichuan-Tibet Railway.
- earthquake,
- surges,
- resonance,
- moraine-dammed lake,
- overtopping failure

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References(23)

References

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