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1 2009

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Numerical dimensioning of vertical grout curtains of earth-fill dams

Machajski J., Simkowska M.

Studia Geotechnica et Mechanica

2009

Vol. 31, nr 4

25-38

This study presents theoretical principles and practical approach to the computations carried out for a grout curtain of an earth-fill dam. The computations were performed within a particular case study of the structure for which the indispensable initial data had been collected both with respect to the structure itself, as well as to the subsoil - previously subject to thorough investigation. The data included geo-engineering and hydro-geological documentation which entailed the area in front of and behind the dam structure, but also the areas where alarming phenomena occurred, associated with the filtration of water under the dam. Using a numerical tool, i.e. the FlexPDE program, the calculations were made for the purpose of determining the reasons for the ensuing faulty situation and in order to assess the possible consequences if the risky situation prolongs. With the intention of meeting potential threats, the installation of a grout curtain was suggested, not only in the threatened area, but also over the entire length of the structure under survey. The computations made it possible to confirm the rightness of the choice of the above-mentioned solution, to determine the required depth of curtain's position and to suggest the technology of its making.