Safety Evaluation of an Arch-Gravity Dam Based on a Small Displacement Hydromechanical Coupled Model

Azevedo, Nuno Monteiro; Farinha, Maria Luísa Braga; Freitas, Gustavo José da Costa; Almeida, João Rocha de

doi:10.1007/978-3-030-64518-2_34

Cited by 1 publication

(2 citation statements)

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“…The performance of the coupled hydromechanical model was also assessed considering a system of six impervious blocks and a saturated discontinuity [46]. Results of the application of Parmac3D-Fflow have been recently presented in [47,48].…”

Section: Coupled Hydromechanical Modelmentioning

confidence: 99%

“…A three-dimensional model of an 83 m high arch-gravity dam and its foundation was created (Figure 8) to carry out hydromechanical analysis and for safety assessment studies. The geometry is based on that of the Ribeiradio dam [47,48], but in this case, the detail of the surface spillway is not included. The dam is simulated by a group of finite element elastic blocks separated by joints, which represent vertical contraction joints.…”

Section: Model Descriptionmentioning

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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Section: Coupled Hydromechanical Modelmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%