Reliability analysis of rapid drawdown of an earth dam using direct coupling

Siacara, Adrian Torrico; Beck, André Teófilo; Futai, Marcos Massao

doi:10.1016/j.compgeo.2019.103336

Cited by 32 publications

(41 citation statements)

References 53 publications

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“…The calculations for transient seepage analysis and slope stability analysis using LEM have improved with advances in computational resources. Recent studies showed how these analyses can successfully be applied to solve various problems (e.g., [30][31][32][33][34][35][36]).…”

Section: Slope Stability Analysismentioning

confidence: 99%

Effects of Hydropower Dam Operation on Riverbank Stability

et al. 2021

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The increasing number of extreme climate events has impacted the operation of reservoirs, resulting in drastic changes in flow releases from reservoirs. Consequently, downstream riverbanks have experienced more rapid and frequent changes of the river water surface elevation (WSE). These changes in the WSE affect pore water pressures in riverbanks, directly influencing slope stability. This study presents an analysis of seepage and slope stability for riverbanks under the influence of steady-state, drawdown, and peaking operations of the Roanoke Rapids Hydropower dam on the lower Roanoke River, North Carolina, USA. Although the riverbanks were found to be stable under all the discharge conditions considered, which indicates that normal operations of the reservoir have no adverse effects on riverbank stability, the factor of safety decreases as the WSE decreases. When the role of fluvial erosion is considered, riverbank stability is found to reduce. Drawdown and fluctuation also decrease the safety factor, though the rate of the decrease depends more on the hydraulic conductivity of the soils rather than the discharge pattern.

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Section: Slope Stability Analysismentioning

confidence: 99%

Effects of Hydropower Dam Operation on Riverbank Stability

et al. 2021

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“…The numerical calculations were implemented by coupling the GeoStudio 2021 (GeoStudio, 2018a(GeoStudio, , 2018b and StRAnD 1.07 (Beck, 2008) software. A complete overview of the direct coupling (DC) procedure is found in Siacara (Siacara et al, , 2020a. The stability and structural reliability of an earth dam is performed in DC and GeoStudio software.…”

Section: Steps Of the Probabilistic Modelingmentioning

confidence: 99%

“…Transformation schemes, such as first-and second-order reliability methods (FORM and SORM) are competitive with PEMs, in terms of computational effort, but are more appropriate and accurate for evaluating small failure probabilities controlled by distribution tails. The FORM loses accuracy when dealing with highly nonlinear limit state functions, where PEMs also fail (Siacara et al, , 2020a.…”

Section: Introductionmentioning

confidence: 99%

“…This Chapter proposes the reliability analysis of an earth dam by the so-called direct coupling (Kroetz et al, 2018;Leonel et al, 2011;Napa-garcía, 2014;Siacara et al, , 2020a. In direct coupling (DC), the powerful software of reliability analysis StRAnD v1.07 (Beck, 2008) allows using different reliability methods, reliability analysis and statistical distributions, and the GeoStudio v2018.00 software (GeoStudio, 2018a(GeoStudio, , 2018b can solve different geotechnical problems with different geometries, material models and water conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In this Chapter, the Direct Coupling (DC) technique is employed to combine the deterministic software GeoStudio 2019 (GeoStudio, 2018a, 2018b) with the structural reliability program StRAnD, version 2.01 (Beck, 2008). The so-called DC method (Kroetz et al, 2018;Leonel et al, 2011;Mouyeaux et al, 2018;Napa-garcía, 2014;Siacara et al, , 2020a appears to be an efficient method for finding the critical probabilistic slip surface and evaluating structural reliability in slope and dam stability problems. StRAnD follows the FORM algorithms, as required by the user, and computes the failure probabilities.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reliability-based design of an earth and concrete dam.

Siacara¹

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Robust reliability‐based design approach by inverse FORM with adaptive conjugate search algorithm

Hanzo

Zhang

et al. 2023

Num Anal Meth Geomechanics

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The concept of reliability‐based design (RBD) of geotechnical works has seen great success in recent years, nevertheless, its application in real‐world engineering practice is still limited. This phenomenon could be mainly attributed to two aspects: the engineer's unfamiliarity of reliability algorithms even in their simplest forms, and the lack of direct connection between reliability algorithms and deterministic design tools. To promote the geotechnical RBD application, this study proposes an inverse first‐order reliability method (FORM) integrating adaptive conjugate direction search technique (RBD via conjugate FORM) to solve classical RBD problems where the number of (multiple) limit state functions is usually equal to the number of unknown design parameters. Notably, the RBD via conjugate FORM can readily back‐calculate those unknown design parameters subject to prescribed reliability index or probability of failure, by means of iterative evaluation of the parametric sensitivities. The proposed algorithm is first verified by several well‐documented examples. Comparative studies show that when the reliability problem to solve is highly nonlinear, the RBD results based on steepest descent search direction may fall in oscillation and non‐convergence, while the proposed RBD via conjugate FORM algorithm performs robustly and efficiently. It is then illustrated in combination with standalone numerical codes to conduct risk‐based optimization of unknown design parameters for two soil slope stability models. The first slope RBD model achieves designing the slope angle under specified reliability index, and the second slope RBD model is to optimize multiple design parameters of the stabilization pile, which can meet different slope reliability requirements under static and seismic loading conditions simultaneously.

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Reliability analysis of rapid drawdown of an earth dam using direct coupling

Cited by 32 publications

References 53 publications

Effects of Hydropower Dam Operation on Riverbank Stability

Effects of Hydropower Dam Operation on Riverbank Stability

Reliability-based design of an earth and concrete dam.

Robust reliability‐based design approach by inverse FORM with adaptive conjugate search algorithm

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