Effect of Normal and Shear Interaction Stiffnesses on Three‐Dimensional Viscoplastic Creep Behaviour of a CFR Dam

Karalar, Memduh; Çavuşli, Murat

doi:10.1155/2018/2491652

Cited by 9 publications

(5 citation statements)

References 25 publications

(24 reference statements)

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“…Tanks to the interface elements, a realistic interaction condition is provided between the discrete surfaces. Te numerical values of the interface elements in the normal and shear directions defned between the discrete surfaces are 10 8 Pa/m [40]. Interface elements defned between discrete surfaces are shown in Figure 3.…”

Section: 3d Finite-difference Modelling Of Ermenek Dammentioning

confidence: 99%

Evaluating the Relationship between Reservoir Level Changes and Earthquake Damage Responses of High Arch Dams: A 3D Numerical Study of Ermenek Arch Dam (220 m) in Turkey

Çavuşli

2023

Advances in Civil Engineering

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Examining the earthquake behaviors of important water structures such as arch dams is of great importance for the future and safety of these structures. Besides, different reservoir heights, which occur as a result of different seasonal precipitation, can cause great losses in the structural behavior of arch dams. For this reason, in this study, the effects of various reservoir water heights on the earthquake behavior of arch dams are evaluated by considering a creep material model. Ermenek dam, one of the highest dams in Turkey, is chosen for the 3D (3D) numerical analyses. This dam has 4 different gallery spaces in its body and it has a body height of 220 m. While creating a 3D finite-different model of the dam, the creep material models are utilized for the concrete and foundation sections. For the 3D earthquake analyses, free-field and quiet nonreflecting boundary conditions (BCs) are defined to the boundaries of the model. Besides, fix BCs are added to the base of the dam. While creating the gallery spaces of the dam, the original dam project is taken into consideration, and attention is paid to creating the oval geometry of the gallery spaces following the project. For earthquake analyses, 4 different water levels (25 m, 85 m, 150 m, and 200 m) are considered, and hydrostatic forces and water table are used while generating the reservoir water. Furthermore, a total of 18 different strong ground motions are used in the earthquake analyses to examine the earthquake behavior of the dam. According to the earthquake analyses, it is concluded that different reservoir heights have great effects on the earthquake behavior of the Ermenek dam. Moreover, it has been observed that the height of the reservoir water causes significant earthquake stress and displacement differences around the gallery spaces of the dam.

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Section: 3d Finite-difference Modelling Of Ermenek Dammentioning

confidence: 99%

Evaluating the Relationship between Reservoir Level Changes and Earthquake Damage Responses of High Arch Dams: A 3D Numerical Study of Ermenek Arch Dam (220 m) in Turkey

Çavuşli

2023

Advances in Civil Engineering

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“…Thanks to these interaction elements, important information about the interaction problems of clay core rockfill dams have been presented. The value of the interaction elements defined between the discrete surfaces is 10 8 Pa/m [27]. Then, the Mohr-Coulomb material model was defined for the clay core, rockfill, and foundation parts of the dam.…”

Section: Three-dimensional Modelling Of Kozlu Dammentioning

confidence: 99%

Examination of 3D Finite Difference Analyses of Zonguldak-Kozlu CCR Dam Subjected Strong Ground Motions Considering Dam-Foundation-Reservoir Interaction

Çavuşli

2022

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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Dams are one of the most important water structures built to meet the vital needs of people such as irrigation and energy. It is of great importance to examine the seismic safety of important water structures such as dams. In addition, it is vital to investigate the interaction behavior of dams due to the bodies of the dams, the reservoir water, and the foundation being in constant interaction. Therefore, in this study, the seismic behavior of clay core rockfill (CCR) dams is investigated by considering the dam-foundation-reservoir interaction. The Kozlu CCR dam, which was built in Turkey-Zonguldak, is chosen for seismic analyses. Three-dimensional (3D) modeling and analysis of the dam are performed utilizing the FLAC3D program. The foundation section is extended down to the height of the dam, and free-field and quiet non-reflecting boundary conditions are defined to the lateral boundaries of the foundation. Besides, the fix boundary condition is taken into account in the base section of the foundation. The Mohr-Coulomb material model is utilized for dam body material and foundation. Special interaction elements have been assigned between the discrete surfaces. These elements are affected to the 3D model of the dam in the x, y, and z directions. A total of 10 different earthquakes are used for earthquake analyses. Accelerations are defined in the program with the help of special fish functions and accelerations are applied to the base of the dam. As a result of the earthquake analyses, it is concluded that significant displacement and principal stresses occurred in the dam body for each earthquake. Moreover, as a result of this study, the dam-foundation-reservoir interaction problems of CCR dams are revealed by considering different ground motions.

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“…For this purpose, Boyabat CG dam that is one of the biggest concrete gravity dams in Turkey is selected as a numerical application. Karalar and Çavuşli [15] studies observed how the time-dependent displacement and stress behavior of a concrete-faced rockfill (CFR) dam change by the effect of the normal and shear interaction spring stiffness parameters. Ilısu Dam that is the longest concrete-faced rockfill dam in the world now and has been completed in the year 2017 is selected for the threedimensional (3D) creep analyses.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

Mousavimehr

Yamini

Kavianpour

2021

Shock and Vibration

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Spillways are the most important structures of large dams that are responsible for releasing the excessive flood discharge from the reservoir. Although many studies have been performed to determine the flow characteristics over these structures, however, the available information on the shockwaves’ characteristics for spillways’ design is limited. The supercritical flow below the chute piers generates an aerated flow known as shockwaves. Due to the flow interaction with the chute piers, three kinds of standing waves just downstream of the pier, in the middle of the chute, and on the sidewalls are generated. This phenomenon affects the flow domain and its hydraulic characteristics along the chute spillway. The height of the waves increases downstream, where they hit the chute walls and reflect again into the flow to interact together again. The process repeated and intensified downstream in a lozenge shape. The height of these waves can be more than twice the depth flow and thus run over the sidewalls. This is important for the design of chute walls in chute spillways with control gates. In this study, the experimental formation of the shockwaves and their behavior along the chute and their reduction measures are presented. Experiments were conducted on a scaled physical model (1/50) of Kheirabad Dam, Water Research Institute, Iran. It was realized that apart from the geometry of piers and chute spillway, Froude number of flow and gate opening are the main effective parameters on the hydraulic performance of shockwaves’ formation and their development on gated spillways.

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Effect of Normal and Shear Interaction Stiffnesses on Three‐Dimensional Viscoplastic Creep Behaviour of a CFR Dam

Cited by 9 publications

References 25 publications

Evaluating the Relationship between Reservoir Level Changes and Earthquake Damage Responses of High Arch Dams: A 3D Numerical Study of Ermenek Arch Dam (220 m) in Turkey

Evaluating the Relationship between Reservoir Level Changes and Earthquake Damage Responses of High Arch Dams: A 3D Numerical Study of Ermenek Arch Dam (220 m) in Turkey

Examination of 3D Finite Difference Analyses of Zonguldak-Kozlu CCR Dam Subjected Strong Ground Motions Considering Dam-Foundation-Reservoir Interaction

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

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