Reliability analysis of earth dams using direct coupling

Siacara, Adrian Torrico; Napa-García, Gian Franco; Beck, André Teófilo; Futai, Marcos Massao

doi:10.1016/j.jrmge.2019.07.012

Cited by 35 publications

(19 citation statements)

References 54 publications

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“…The deterministic GeoStudio 2019 [19,20] software and the probabilistic StRAnD 1.07 [21] software were implemented using direct coupling to perform deterministic and probabilistic calculations. An earth dam in long-term steady-state and during a rapid drawdown was discussed by Siacara et al [31,39]. In this research, an earth dam in normal operating conditions (NOC) was evaluated.…”

Section: Probabilistic Modelingmentioning

confidence: 98%

“…The procedure implemented is described in this section. The flowchart shown by Siacara et al [31,39], and the FORTRAN code were modified as shown in Fig. 1: ).…”

Section: Probabilistic Modelingmentioning

confidence: 99%

“…The deterministic parameters (nominal parameters) were quantified by field instrumentation, laboratory and field tests from previous studies of the dam, and the uncertainty in soil parameters was quantified from the literature [39].…”

Section: Dam Condition Of Analysismentioning

confidence: 99%

“…The mean (µ) and the coefficient of variation (COV) of all parameters are shown in Table 2. In terms of COV of soil parameters, Phoon [16] reported different range of values and Siacara et al [31,39] applied it in earth dams.…”

Section: Dam Condition Of Analysismentioning

confidence: 99%

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Reliability analysis of an earth dam in operating conditions using direct coupling

Siacara

Napa-García²,

Beck

et al. 2022

SN Appl. Sci.

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In this study, we present a numerical investigation of the direct coupling between the deterministic GeoStudio package (Seepage/W and Slope/W software) and the StRAnD reliability package for normal operating conditions of an existing old earth dam over time. Direct coupling avoids errors associated to point estimate methods and to using response surface surrogates. One relevant feature of the study is the use of realistic pore water pressures for each equilibrium analysis, accomplished by considering a long-term steady-state analysis as an initial condition, followed by four years of equilibrium analysis, before each transient seepage analysis. All reliability analysis were performed using the first-order reliability method. The most important random parameters found in sensitivity analyses are four dam body parameters (saturated hydraulic conductivity, ks; specific weight, γ; effective cohesion, c′; and friction angle, ϕ′) and two filter parameters (ks and ϕ′). A range of values of the relationship between the reliability index (β) and the factor of safety (FS) was found for all probabilistic and deterministic results. Finally, a large difference in terms of critical deterministic and probabilistic slip surfaces is identified for the same time of analysis. Article highlights Realistic pore water pressures used in dam equilibrium analysis, by considering random seepage analysis in previous 5 to 30 days. Direct coupling of deterministic and reliability softwares avoids errors associated to point estimate and response surface surrogate methods. Existing old earth dam studied in Normal Operating Condition. For same analysis time, large differences are observed between critical deterministic and probabilistic slip surfaces.

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Section: Probabilistic Modelingmentioning

confidence: 98%

“…The procedure implemented is described in this section. The flowchart shown by Siacara et al [31,39], and the FORTRAN code were modified as shown in Fig. 1: ).…”

Section: Probabilistic Modelingmentioning

confidence: 99%

Section: Dam Condition Of Analysismentioning

confidence: 99%

Section: Dam Condition Of Analysismentioning

confidence: 99%

See 2 more Smart Citations

Reliability analysis of an earth dam in operating conditions using direct coupling

Siacara

Napa-García²,

Beck

et al. 2022

SN Appl. Sci.

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show abstract

“…Therefore, regular check and maintenance are necessary to ensure the regular and continuous operation of dam and the hydroelectric power plant. As such, the dam reliability study was conducted to investigate the structure integrity of dam and to improve performances of hydroelectric generation [1][2][3][4]. In the past literatures, the structural reliability of dam was mainly investigated from the perspectives on the interaction with fluid flow, such that the structural stress and deformation were induced by the rapid and continuous water flow throughout the dam operation [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Finite Volume Method Numerical Modelling of the Penstock Flows in Dam Intake Sector Subjected to Varying Operating Conditions with Particle Image Velocimetry Validation

Zahari

Zawawi

et al. 2021

ARFMTS

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The formation of vortex and swirling in any flow structures of the hydropower dam is undesirable, as it reduced the performance of turbine as well as lowered the efficiency of hydroelectric power generation. Furthermore, it could lead to the hydraulic losses at the entrance of power intakes, the blockage at the trash racks due to entrain debris and the reduction of the working life of turbines. This paper studied penstocks flows in the dam intake section numerically. The dynamics of penstocks flows at different operating conditions were analyzed to determine the vortex formation. To access the veracity of the current proposed numerical model, a validating study based on the particle image velocimetry (PIV) experiment was conducted. It was found the discrepancy between both numerical and experimental flow velocities is 12%, implying the numerical model is well-validated and the corresponding findings are acceptable. It was found that the vortex was formed in the penstock that located at the lowest level relative to other penstocks. Furthermore, the highest pressure of 4 MPa was recorded at the bottom section of the penstock which observed vortex. This numerical work provided useful insights for the future dam reliability analysis, particularly involving penstocks and intake section.

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