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TOWARDS A BETTER FORECAST FOR RESERVOIR SLOPE SLIDINg

International Journal of Sediment Research 2003年第4期18卷 278-289页

作者： Didier MAROT,Alain ALEXIS,Pierre THOMAS Doctor IUT de saint nazaire laboratolre génie civil nantes-saint nazaire. bp 420 44606 saint nazaire.cedex Doctor-Engineer IUT de saint nazaire Laboratoire génie civil nantes-saint nazaire. bp 420 44606 saint nazaire.cedex Professor IUT de saint nazaire Laboratoire génie civil nantes-saint nazaire. bp 420 44606 saint nazaire.cedex

The siltation of reservoir causes many problems of management and environmental disturbances that are important to minimize. Solving these problems requires in particular a good knowledge of mud bank instabilities. In partnership with the Laboratoire National d'Hydraulique (LNH), a subsidiary of Electricite de France (E.D.F.), authors realize a study of soft soils sliding entailed by reservoir emptying. Using a geotechnical flat sliding mechanism, the theoretical formulation of the safety factor can be established when the sediment mass is submerged and emergent. The measurement campaign carried out makes it possible to obtain bathymetric and topographic surveys and a geotechnical characterization of the soil for the whole reservoir of grangent dam, located on the Loire (France). The proposed model appears to agree satisfactorily with the instability of the zones emerged because of the emptying and with the stability of the profile after emptying. The use of this model within the framework of forecasts

关键词： Soft soils Mud Bank Sliding Dam reservoir Emptying

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SEDIMENTATION AND CONSOLIDATION OF A HIgH WATER CONTENT SOIL

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International Journal of Sediment Research 2000年第3期15卷 269-276页

作者： ALEXIS Alain, LE BRAS gilbert Researcher, Laboratoire de genie civil de Names saint-nazaire. IUT de saint-nazaire. saint nazaire.France PHD Student, Laboratoire de genie civil de Names saint-nazaire. IUT de saint-nazaire. saint nazaire.France Tel. 00 33 Lab. de genie Civ. de nantes IUT de Saint-Nazaire Saint Nazaire France

The permanent siltation of harbours and estuaries has led their administrative companies to undertake dredging operations in order to guarantee a minimal water depth required for free access to port infrastructures. This long and expensive work interferes with the port trade. Dredged material is injected into the sea with the creation of a maritime dump or stocked on earth in basins. In each case, there will be a formation of a high water content soil. This paper deals with the geotechnical formation of high water content soils by means of an experimental laboratory sedimentation/consolidation bench. We have devised and realized a controlled bench which allows us to analyze the natural soil formation under self weight. The tested soil settles in sedimentation/consolidation columns (1.5 m. in height, 100 mm in diameter). Pressure and density measurements in the tested soil are possible on the whole height of the vertical column. Values of density are obtained by gamma-densimetry. The precision of the measurements is +/-0.5% for the density and +/-3 Pa for the pressures. Each test is performed over 32 days with 17 intermediate times. An originality of this bench lies in the fact that it allows measurements with a good precision in density and pressure at a very early state of soil formation (first values at 1 .33 min. from the beginning of the test). The test we are presenting concerned the natural mud found in the Loire estuary (France) prepared to an initial concentration of 200 g/ 1 (density 1. 135). These measurements are studied in terms of evolution of total stress, excess pore pressure, void ratio and effective stress as related to time. For this test, we present the density and pressure measured profiles as well as the deduced effective stress curves, paths of particles and rates of consolidation. On a void ratio versus effective stress diagram, we clearly show the evolution of soil consolidating under self weight during the intermediate phase of its formation

关键词： High water content soils Sedimentation/consolidation Density Pore pressure Effective stress Particle trajectory.

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