As barragens de enrocamento com face de concreto (BEFC) têm sido construídas com freqüência crescente em todo mundo. Apesar disso, os critérios de. Many translated example sentences containing “barragens de enrocamento” Simpósio Sobre Barragens de Enrocamento com face de Concreto [ ]. 15 out. PERCOLAÇÃO NAS BARRAGENS DE ENROCAMENTO COM FACE DE CONCRETO EM CONSTRUÇÃO – Nelson L. de S. Pinto.

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This model doesn’t consider the joints between the slabs of the concrete face. Skip to main content.

At Campos Novos Dam, built in a narrow valley, the displacements of the superficial benchmarks showed an accentuated move towards the center of the valley. However, it seems that his confidence in the stability of this type of dam regarding its resistance to normal operation loads and to the action of eventual water seepage led to adoption of some practical design criteria not totally applicable in very high dams built in narrow valleys, where stress levels extrapolated the already experienced values.

Due to the result of the computations, double reinforcement mesh was adopted in large portion of the concrete face, contrary to the usual practice of using a single mesh in the center of the face.

This prediction must take in place the geological-geotechnical features, the shape and topography of the valley and the properties of available construction materials. In other cases, leakages occurred by the failure of water stops due to excessive deformation.

Log In Sign Up. The rockfill embankment behavior is conditioned by several factors such as embankment zoning see Oliveira — Ref. Numerical model analyses were done to predict probable displacements of the concrete face, which were then imposed to the slabs to obtain the respective stresses.

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II SIMPÓSIO SOBRE BARRAGENS DE ENROCAMENTO

In his works, Cooke states that the principle of precedents must be followed, but it cannot be restrictive to the progress, either for the implementation of higher dams or for the adoption of more garragens solutions. It also presents reflections for criteria development for future design of very high CFRDs in order to avoid such failures.

Thus, progressive modifications were introduced in the CFRD design, among them: However, an ordered design approach is fundamental to guarantee an adequate performance of future high CFRD dams. They presented a quite safety behaviorbut with significant leakages as they height increased up to 90m.

Cconcreto study aims at presenting a discussion on the main factors of development of these stresses. However, some of these dams presented infiltration problems. These minimizations are so more expressive as smaller are the widths of the slabs.

Flávio Alberto Crispel

This model must be dynamic, not only to define the ocm of the embankment as well as future adjustments, in function of the monitoring during the construction. It must be pointed out that this feature is critical on abutments. For this goal, studies should be developed with numerical models to estimate, from the very beginning of the design, the displacements and stresses in the dam.

Except for the Salvajina dam, the others were built in narrow valleys. Such major infiltrations were associated to excessive displacements of the slabs in relation to the support plinth, whose perimetral joint was not designed to bear such displacement.

It is worth repeating the technical contribution of Mr.

REFLECTIONS ON NEW DESIGN OF VERY HIGH Concrete face rockfill dams | Ciro Humes –

Compressive joints should be used in a way to allow the movement of the central slabs and relieve the compressive stresses among them. Compressive stresses in the concrete face with 4 Joints MPa These results show that compressible joints are effective to avoid the development of high compressive stresses. These modifications were successfully introduced in dams built in Brazil and in the world; however, all of them with d below m the height of Foz do Areia dam.

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Enrpcamento me on this computer.

However, the larger compression stresses may not be only “horizontal” along the whole concrete face. This dam, built in open valley, has been showing excellent performance, and was a reference.

The basic principle stated by Cooke – Ref. From toafter the good behavior observed in six se rockfill dams belonging to Pacific Gas and Electric Company USAwith heights between 23 and 45 m, higher dams were built, among them are the Salt Springs Dam USA and Paradela Dam Portugalwith heights of and m, respectively. This would be an acceptable approach for CFRDs have intrinsic stability in function of the following features: Barry Cooke died in Help Center Find new research papers in: This problem was solved cooncreto further dams by changing the zoning of the fill material in the region of interest and new design of the perimetral joint, which had more than one sealing element and, as an additional defense line, when viable, a clay fill on the perimetral joint.

Wetting of all the materials and in every zone should be done, not only in the upstream third, as usual.