Deep Stability Evaluation of High-Gravity Dam under Combining Action of Powerhouse and Dam

Su, Huaizhi; Hu, Jiang; Li, Jinyou; Zhong-ru, WU

doi:10.1061/(asce)gm.1943-5622.0000206

Cited by 18 publications

(7 citation statements)

References 19 publications

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“…The measurements vary from one monitoring point to others. Therefore, judgement criteria of dam structure are employed to describe the safety reliability of each monitoring point according to the measurement variation [14]. There are five evaluation indexes in the judgement criteria of dam structure.…”

Section: Risk Assessment System Of Single Monitoring Pointmentioning

confidence: 99%

Dam Safety Evaluation Based on Interval-Valued Intuitionistic Fuzzy Sets and Evidence Theory

Shu

Bao

et al. 2020

Sensors

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Considering the multi-sources, heterogeneity and complexity of dam safety assessment, a dam safety assessment model based on interval-valued intuitionistic fuzzy set and evidence theory is proposed to perform dam safety reliability evaluations. In the proposed model, the dynamic reliability based on the supporting degree is applied to modify the data from homologous information. The interval-valued intuitionistic fuzzy set is used to describing the uncertainty and fuzziness between heterogeneous information. Evidence theory is employed to integrate the data from heterogeneous information. Finally, a multiple-arch dam undergoing structural reinforcement is taken as an example. The evaluation result before reinforcement shows that the safety degree of the dam is low and the potential risk is more likely to be located at the dam section #13. From the geological survey before reinforcement, there exist weak fracture zone and broken mud belt in the foundation of the dam section #13. The comparison between the evaluation results before and after reinforcement indicates that the dam become safer and more stable after reinforcement.

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Section: Risk Assessment System Of Single Monitoring Pointmentioning

confidence: 99%

Dam Safety Evaluation Based on Interval-Valued Intuitionistic Fuzzy Sets and Evidence Theory

Shu

Bao

et al. 2020

Sensors

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“…, 2017), interface stress element method (ISEM) (Zhang et al. , 2012), discontinuous deformation analysis (DDA) (Su et al. , 2013), block element method (BEM) (Chen et al.…”

Section: Introductionmentioning

confidence: 99%

System reliability analysis of foundation stability of gravity dams considering anisotropic seepage and multiple sliding surfaces

Yang²,

Wu³

2022

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PurposeFor gravity dams built on foundations with directional joint sets, the seepage in the foundation possesses anisotropic characteristics and may have adverse effects on the foundation stability. A methodology for system reliability analysis of gravity dam foundations considering anisotropic seepage and multiple sliding surfaces is proposed in this paper.Design/methodology/approachAnisotropic seepages in dam foundations are simulated using finite element method (FEM) with the equivalent continuum model (ECM), and their effect on dam foundation stability is involved by uplift pressures acting on the potential sliding surfaces. The system failure probability of the dam foundation is efficiently estimated using Monte Carlo method (MCM) combined with response surface method (RSM).FindingsThe case study shows that it is necessary to consider the possibly adverse effect of anisotropic seepage on foundation stability of gravity dams and the deterministic analysis of the foundation stability may be misleading. The system reliability analysis of the dam foundation is justified, as the uncertainties in shear strength parameters of the foundation rocks and joint sets as well as aperture, connectivity and spacing of the joint sets are quantified and the system effect of the multiple potential sliding surfaces on the foundation reliability is reasonably considered.Originality/value(1) A methodology is proposed for efficient system reliability analysis of foundation stability of gravity dams considering anisotropic seepage and multiple sliding surfaces (2) The influence of anisotropic seepage on the stability of gravity dam foundation is revealed (3) The influence of estimation errors of RSMs on the system reliability assessment of dam foundation is investigated.

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“…In comparison with shallow sliding, deep sliding, which arouses popular attention, is more complicated because of the difficulty of assessing rock mass structures and the complexity of determining their shear parameters [4]. Even so, scholars have conducted substantial research on the failure mechanisms of many large-scale dams [18,22,23].…”

Section: Introductionmentioning

confidence: 99%

Buckling Failure Mechanism of a Rock Dam Foundation Fractured by Gentle Through-Going and Steep Structural Discontinuities

Chen

Wen

et al. 2020

Sustainability

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The failure mechanism analysis of dam foundations is key for designing hydropower stations. This study analyses the rock masses in a sluice section, which is an important part of the main dam of the Datengxia Hydropower Station currently built in China. The stability of the sluice rock masses is predominantly affected by gentle through-going soft interlayers and steep structural fractures. Its foundation failure mechanism is investigated by means of a numerical method, i.e., Universal Distinct Element Code (UDEC) and the geomechanical model method. The modeling principle and process, and results for the rock dam foundation are introduced and generated by using the abovementioned two methods. The results indicate that the failure mechanism of the foundation rock masses, as characterized by gentle through-going and steep structural discontinuities, is not a conventional type of shear failure mechanism but a buckling one. This type of failure mechanism is verified by analyzing the deformation features resulting from the overloading of both methods and strength reduction of the numerical method.

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Deep Stability Evaluation of High-Gravity Dam under Combining Action of Powerhouse and Dam

Cited by 18 publications

References 19 publications

Dam Safety Evaluation Based on Interval-Valued Intuitionistic Fuzzy Sets and Evidence Theory

Dam Safety Evaluation Based on Interval-Valued Intuitionistic Fuzzy Sets and Evidence Theory

System reliability analysis of foundation stability of gravity dams considering anisotropic seepage and multiple sliding surfaces

Buckling Failure Mechanism of a Rock Dam Foundation Fractured by Gentle Through-Going and Steep Structural Discontinuities

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