Presa de Grandval

C Laroche,H Legros

doi:10.3989/ic.1963.v16.i155.4638

Abstract

This important project is situated on the top section of the river Truyere, within the region of the French Central Massif. The dam has been constructed by the Electricite de France. The total hydroelectric development project in this zone involves six dams and six power stations, to exploit an overall hydrostatic head of 520 ms. The water accumulated by these dams has a maximum volume of 540.10 6 cubic metres, and will produce a yearly output of 1450 .10 6 kWh. The Grandval dam rests on strong microschistous rock folds. Its length is 330 ms, and its maximum height 88 ms, measured from the foundation base. Structurally it is formed by a series of vaults supported by abutments, which are spaced at 50 ms intervals. The mean thickness of the vaults at the base is 4.90 ms, and 1.50 at the crown. The vertical slope on the upstream side is 0.70. A feature of this design is that the vaults are not uniformly cylindrical up to the top, as is customary. The top part of the dam consists, in fact, of a small gravity dam, resting on the underlying vaulted structure. The dam is straight at the top, and a road runs along it, on an overhanging structure. The dam has a surface spillway, which is ski jump shaped, and runs over the two abutments on either side of the power station.

Highlights

Esta importante obra se halla situada en el tramo superior del río Truyère, en la región del Macizo Central francés.
El conjunto del aprovechamiento hidroeléctrico tiene seis presas y otras tantas centrales que aprovechan un salto total de 530 m de altura, y las aguas almacenadas en un embalse cuya capacidad total se eleva a 540x10* m^ que proporcionarán una producción anual de 1.450x108 k W h .
El conjunto de este aprovechamiento hidroeléctrico, realizado por Electricité de France, consta de seis presas y seis centrales que aprovechan u n salto hidrostático total de 520 m de altura y aportaciones medias del orden de 850 x 16" m^ por año para el embalse de Grandval y de 2.300 x 10" m** para otros embalses.

Summary

Introduction

Esta importante obra se halla situada en el tramo superior del río Truyère, en la región del Macizo Central francés. El conjunto del aprovechamiento hidroeléctrico tiene seis presas y otras tantas centrales que aprovechan un salto total de 530 m de altura, y las aguas almacenadas en un embalse cuya capacidad total se eleva a 540x10* m^ que proporcionarán una producción anual de 1.450x108 k W h .

Results

Conclusion