Small Displacement Coupled Analysis of Concrete Gravity Dam Foundations: Static and Dynamic Conditions

Farinha, Maria Luísa Braga; Azevedo, Nuno Monteiro; Candeias, Mariline

doi:10.1007/s00603-016-1125-7

Cited by 15 publications

(19 citation statements)

References 25 publications

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“…The concrete partitions are deterministic, and each partition can be considered uniform and isotropic . On the other hand, the foundation material cannot be considered uniform or isotropic owing to its complex mechanical properties …”

Section: Methodsmentioning

confidence: 99%

“…29 On the other hand, the foundation material cannot be considered uniform or isotropic owing to its complex mechanical properties. 30 The material properties of the dam body and the foundation are quite different. Therefore, in order to obtain reliable information reflecting the characteristics of dam body and foundation, the displacement of the measuring points due to the dam should be separated from that due to the foundation.…”

Section: Introductionmentioning

confidence: 99%

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A deformation separation method for gravity dam body and foundation based on the observed displacements

Lin

Liu

et al. 2018

Struct Control Health Monit

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Summary The displacement at arbitrary point in the dam is composed of two parts: One is the elastic deformation of dam body and the other that is due to the constrained deformation of foundation. The two parts should be separated to obtain reliable information reflecting the different characteristics of dam body and foundation. A simplified simulation method for gravity dam foundations is proposed that reflects the constrained deformation of foundation in a rational manner while taking into account the complex and diverse mechanical properties. Only the effects of the foundation on dam is investigated in the proposed model, and they are considered either centralized constraints or distributed constraints. The solution of the global foundation deformation is based on the monitoring displacements at measuring points in the gravity dam section using the hybrid partition finite element–interface boundary element approach. The reaction of the foundation on dam can be reflected by the global foundation deformation and the constrained force at dam bottom. On the basis, the whole dam response under a given load combination can be estimated using finite element theory. Three analyses have been performed on a typical gravity dam section to verify the feasibility of simplified simulations for different foundations as well as to allow for discussions regarding the differences among the simulations. An example analysis based on the proposed method is performed on a prototype gravity dam, and the results, which compared with actual measurements for discussions, show that the proposed method is reasonable and practical.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A deformation separation method for gravity dam body and foundation based on the observed displacements

Lin

Liu

et al. 2018

Struct Control Health Monit

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“…The 3D discontinuum hydromechanical model used in this study performs a fully coupled hydromechanical analysis, where fracture conductivity is dependent on mechanical deformation and the mechanical behavior is affected by water pressures. The code presented here, Parmac3D-Fflow, is an extension to 3D of a 2D code previously developed, which has been used in both static and dynamic analysis of gravity dam foundations [8] and is part of a computational model initially developed for concrete fracture analysis [33].…”

Section: Governing Equations and Numerical Codementioning

confidence: 99%

“…Fully coupled two-dimensional (2D) hydromechanical analyses of the water flow through the rock mass discontinuities of operating dams were presented by several authors [6][7][8][9], some of them allowing the comparison between numerical results and those recorded in situ. The majority of these studies use discontinuum models, which simulate the hydromechanical interaction and therefore provide a means of assessing the stability of the dam, taking into account the actual shear displacements and aperture of discontinuities, and the water pressure pattern within the foundation.…”

Section: Introductionmentioning

confidence: 99%

“…For this purpose, the authors propose a methodology that allows safety analysis to be carried out taking into account the specific features and hydromechanical behavior of dam foundations. This paper starts by describing in detail the formulation of the 3D discontinuum hydromechanical model used in this study, implemented in the numerical code Parmac3D-Fflow, which is a small displacement finite element model for coupled hydromechanical analysis of concrete dam foundations, developed from the 2D version of the same code [8,35]. The authors propose the use of a simplified model to simulate the hydraulic behavior, assuming that seepage takes place along channels located at the edges of the interface elements which simulate the discontinuities.…”

Section: Introductionmentioning

confidence: 99%

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Sliding Stability Assessment of Concrete Dams Using a 3D Discontinuum Hydromechanical Model Following a Discrete Crack Approach

et al. 2022

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Evaluation of the sliding stability of concrete dams requires the use of numerical tools not only able to simulate the coupled hydromechanical behavior but also able to adequately represent the foundation discontinuities and the specific features of dam foundations. The formulation of a three-dimensional (3D) small displacement finite element model based on interface elements to simulate the discontinuities is presented. In this model, the hydraulic behavior is simulated assuming that the water flow occurs only along channels located at the edges of the triangular interface elements that simulate the discontinuities. The model is used to perform coupled hydromechanical analysis of a large arch-gravity dam and to assess safety against dam base sliding, assuming different constitutive models at the dam/foundation interface and two different approaches: (i) strength reduction method and (ii) amplification of the hydrostatic pressure, assuming an increase in the reservoir level. The present study shows that consistent results are obtained with the proposed numerical model and that stability analysis should preferably be carried out using the method of increasing the hydrostatic pressure and the corresponding uplift pressures, as this methodology leads to significantly lower safety factors.

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Seismic Analysis of Pine Flat Concrete Dam: Comparison of Numerical Results from 2D and 3D Analysis

Azevedo

Farinha

Cámara

et al. 2020

Lecture Notes in Civil Engineering

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Small Displacement Coupled Analysis of Concrete Gravity Dam Foundations: Static and Dynamic Conditions

Cited by 15 publications

References 25 publications

A deformation separation method for gravity dam body and foundation based on the observed displacements

A deformation separation method for gravity dam body and foundation based on the observed displacements

Sliding Stability Assessment of Concrete Dams Using a 3D Discontinuum Hydromechanical Model Following a Discrete Crack Approach

Seismic Analysis of Pine Flat Concrete Dam: Comparison of Numerical Results from 2D and 3D Analysis

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