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Some aggressive rock environment in the area of Prague, the groundwater and the associated protection of building structures
Štěpán, Jiří ; Král, Jan (advisor) ; Chaloupka, David (referee)
This master thesis deals with groundwater aggressiveness on one sheet of detailed engineering geology map of Prague 1:5000, sheet Praha 2-3. The aim of this thesis si an effort to verify how much geological environment participates in chemical composition of groundwater. The chemical analyses were evaluated using limit values stated in valid norm ČSN EN 206 Concrete - Specification, performance, production and conformity. The chemical analyses that analysed aggressive components (SO4 2- , CO2, pH, NH4 + , Mg2+ ) and total dissolved solids discovered that the geological environment affects the chemical composition of groundwater very strongly. The chemical composition of groundwater is influenced by groundwater velocity and therefore by the time which the water stays in contact with the geological environment, by local composition of the rock and its accessories especially pyrite. Groundwater in Ordovician formations in the area of interest is usually contains high amount of dissolved solids and it is calcium-sulphate. Groundwater of Dobrotiv and Libeň formations are significantly less aggressive than groundwater of Letná, Vinice and Zahořany formation. The chemical composition of groundwater in Peruc-Korycany formation corresponds with Letná formation on which it lies.
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