Seismic damage investigation of arch dams under different water levels based on massively parallel computation

Guo, Shu-Guang; Liang, Hui; Wu, Sha; Xiong, Kun; Li, Deyu; Houqun, Chen; Zhang, Aijing

doi:10.1016/j.soildyn.2019.105917

Cited by 12 publications

(3 citation statements)

References 38 publications

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“…In order to truly simulate the impact of ground motion on the damage of the overall system of a concrete gravity dam, unlike the traditional model that considers the foundation as linear elastic or DP plastic, this paper extends the concrete plastic damage model (CDP) to the foundation rock based on the similarity of dam body concrete material and rock materials (Guo et al 2020). Taking the Koyna concrete gravity dam project as an example, the overall damage mechanics model of the concrete gravity dam body-reservoir water-foundation is established.…”

Section: Overall Dynamic Damage Model and Verification Of Gravity Dammentioning

confidence: 99%

“…For example, in the seismic analysis of traditional high concrete dams, the foundation rock mass is mostly used as linear elastic materials or DP elastoplastic models are used (Ansari et al 2016;Sadeghi et al 2020;Li et al 2021). But the simulation cannot accurately reflect the nonlinear performance and stress redistribution phenomenon of rock when subjected to external loads that exceed their tensile and compressive strength (Guo et al 2020;Zhang et al 2021). In fact, the damage and failure of the dam foundation rock mass is also an important part of the overall seismic design and analysis in a gravity dam.…”

Section: Introductionmentioning

confidence: 99%

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Evolution law of overall damage of concrete gravity dam under near-fault ground motion

Zhai¹,

Zhang²,

Zhang³

et al. 2021

Preprint

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Strong earthquake cases of concrete gravity dams show that the foundation damage has an important influence on the seismic response and damage characteristics of the dam body. Compared with non-pulse ground motions, pulse-like near-fault ground motions have a wider response spectrum sensitive zone, which will cause more modes of the structure to respond, resulting in more serious damage to the structure. In order to study the real dynamic damage characteristics of concrete gravity dams under the action of near-fault ground motions, this paper takes Koyna gravity dam as the object and establishes a multi-coupling simulation model that can reasonably reflect the dynamic damage evolution process of dam concrete and foundation rock mass. A total of 12 near-fault ground motion records with three types of rupture directivity pulse, fling-step pulse and non-pulse are selected, deep research on the overall damage evolution law of concrete gravity dams. Considering the additional influence of different earthquake mechanisms, different site types and other factors on the study, the selected ground motion records are from the same seismic events (Chi-Chi), the same direction but different stations. The results show that the foundation of the concretes gravity dam often get damaged before the dam body under the action of strong earthquakes. Compared with the near-fault non-pulse ground motion, the structural damage of the gravity dam under the action of the near-fault directivity pulse ground motion is significantly increased, and causes greater damage and displacement response to the dam body. The near-fault fling-step pulse ground motion has the least impact on the dynamic response of the gravity dam structure.

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Section: Overall Dynamic Damage Model and Verification Of Gravity Dammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolution law of overall damage of concrete gravity dam under near-fault ground motion

Zhai¹,

Zhang²,

Zhang³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The described methods can obtain highly reliable analysis results and prediction accuracy for the local range of general structures. In addition, the effects and monitoring of water levels on the dynamic properties of concrete arch dams have also been deeply studied [16,17].…”

Section: Introductionmentioning

confidence: 99%

Deformation Analysis of an Ultra-High Arch Dam under Different Water Level Conditions Based on Optimized Dynamic Panel Clustering

et al. 2022

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During the operation period, the deformation of an ultra-high arch dam is affected by the large fluctuation of the reservoir water level. Under the dual coupling of the ultra-high dam and the complex water level conditions, the traditional variational analysis method cannot be sufficiently applied to its deformation analysis. The deformation analysis of the ultra-high arch dam, however, is very important in order to judge the dam safety state. To analyze the deformation law of different parts of an ultra-high arch dam, the panel data clustering theory is used to construct a Spatio-temporal characteristic model of dam deformation. In order to solve the difficult problem of the fluctuating displacement of dam deformation with water level effect, three displacement component indexes (absolute quantity, growing, and fluctuation) are proposed to characterize dam deformation. To further optimize the panel clustering deformation model, the objective weight coefficient of clustering comprehensive distance is calculated based on the CRITIC (CRiteria Importance Through Inter-criteria Correlation) method. The zoning rules of the ultra-high arch dam are established by using the idea of the CSP (Constraint Satisfaction Problem) index, and the complex water level of the reservoir is simulated in the whole process. Finally, the dynamic cluster analysis of dam deformation is realized. Through a case study, three typical working conditions including the rapid rise and fall of water level and the normal operation are calculated, and the deformation laws of different deformation zones are analyzed. The results show that the model can reasonably describe the deformation law of an ultra-high arch dam under different water levels, conveniently and intuitively select representative measuring points and key monitoring parts, effectively reducing the analysis workload of lots of measuring points, and improve the reliability of arch dam deformation analysis.

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Seismic Safety Evaluation of a High Arch Dam-Foundation Coupling System

Yan,

Tu,

Liang

et al. 2024

Lecture Notes in Civil Engineering

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The seismic safety evaluation of the dam is performed based on either dam strength failure or dam abutment instability failure according to the traditional deterministic methods and concepts in the current code. However, these two failure modes are interactive and inseparable, considering only one failure mode under a strong earthquake fails to fully reflect the actual seismic performance of high arch dams. To develop a more realistic seismic safety evaluation framework for high arch dams, this paper constructs a finite element analysis model that considers the coupling of dam strength failure and dam abutment instability failure. The nonlinear dynamic response analysis of the high arch dam-foundation coupling system is conducted using the seismic overload analysis method. Different performance evaluation indexes, such as damage depth-thickness ratio, sliding area ratio, and the residual displacement of the dam crest relative to the dam bottom in the stream direction, are proposed. The performance evaluation criteria and ultimate seismic capacity are defined and quantitatively assessed. The results indicate that 2.0 times the horizontal PGA can be considered the ultimate seismic capacity of the high arch dam-foundation coupling system, providing a reliable scientific basis for seismic safety evaluation of high arch dams.

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Seismic damage investigation of arch dams under different water levels based on massively parallel computation

Cited by 12 publications

References 38 publications

Evolution law of overall damage of concrete gravity dam under near-fault ground motion

Evolution law of overall damage of concrete gravity dam under near-fault ground motion

Deformation Analysis of an Ultra-High Arch Dam under Different Water Level Conditions Based on Optimized Dynamic Panel Clustering

Seismic Safety Evaluation of a High Arch Dam-Foundation Coupling System

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