Methoden zur Erkundung und Beschreibung des Untergrundes von Deponien und Altlasten. Ausbreitung von Schadstoffen aus Deponien im Untergrund aus klueftigem Fels unter Beruecksichtigung der Verformbarkeit des Felses bei Belastung Schlussbericht

Contaminant migration in groundwater is influenced by the water permeability of jointed rock, which varies with the loading of the rock mass. The Institute for Foundation Engineering, Soil Mechanics, Rock Mechanics and Waterways Construction of Aachen Technical University has developed conceptual models and program systems for the calculation of stresses, deformation, seepage flow and contaminant migration which can examine the effects of construction measures, e.g. as required for the rehabilitation of contaminated areas, accounting for changes in loading of jointed rock. The conceptual model, which the numerical method for the simulation of contaminant migration in jointed rock is based on, is checked by means of laboratory tests on the mixing behaviour in the intersection area of discontinuities. The numerical results are in good agreement with the data measured in the tests. The test results suggest, that in the intersection area of discontinuities in the case of laminar flow, water-dissolved substances are mainly transported along the flowlines. On the basis of two examples of waste disposal sites situated on jointed rock, the influence of waste load on contaminant migration on the bedrock is examined. The dependence of water permeability on loading is also taken into account here. By means of the presented program systems practical examples for contaminated areas in jointed rock can be dealt with. (orig.)SIGLEAvailable from TIB Hannover: F96B883+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman