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FP5

OASYS Informe resumido

Project ID: EVG1-CT-2002-00061
Financiado con arreglo a: FP5-EESD
País: Hungary

Method for geochemical and sedimentological investigation of loess walls

The deeper geochemical and sedimentological examination of the different deposits (loesses, palaeosols, clay and sand layers) which are built up the high banks can provide new informations to the question of landslide formation and collapsing. It may be hypothesized that the geochemical conditions and petrophysical properties of the sediments are changed by backwaters of ground- and pressure waters and their flow. So, for example the backwater of ground waters has an effect on the carbonate-cementation of the grains in the loess, it leaches the carbonates, besides this the flowing water take away the most fine particles, so it cause suffosion (solution) and leads to collapsing. Also the petrophysical properties (angle of friction, cohesion or value of consistency, porosity) and in this manner the durability or stability of the high banks can be also affected by the change of mineral composition (e.g. formation of clay minerals which have different water absorbing and swelling capacity) of the sediments during these processes and it can lead to formation of a sliding plane or a shear surface.
Investigations have already been carried out that were made in order to disclose the sedimentological and geochemical conditions of loess-paleosol sequences in South-Hungary.

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Reported by

GEODETIC AND GEOPHYSICAL RESEARCH INSTITUTE OF HUNGARIAN ACADEMY OF SCIENCES
Csatkai E. u. 6-8.
9400 SOPRON
Hungary
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