Untertagebauarbeiten bewirken Wechselwirkungen zwischen Bauwerk und Bergwasser, z. B. Auswirkungen auf Obertagewässer, aber auch auf die Bauausführung. Die Ermittlung der Eingangsparameter für eine Prognose ist schwierig, da die Werte nur mit großen Streuungen erfasst werden können. Am Beispiel Brenner-Basistunnel (BBT) werden die einzelnen Schritte von Hydrogeologie, Hydrochemie, Modellierung bis zur Risikoanalyse demonstriert. Der derzeit übliche immense Aufwand für die Eisenbahnrechts-und Umweltverträglichkeits-Verfahren wird hinterfragt. Die Rolle der Sachverständigen wird kritisch beleuchtet. Hydrogeology and Ground Water Protection in Planning and AuthorizationStage. Subsurface constructions cause reciprocal effects between construction and groundwater, e.g. influences on springs, but also on construction performance. The evaluation of the input parameters is quite difficult due to the broad distribution. By the example of the Brenner base tunnel the steps from hydrogeology via hydrochemistry, ground water modelling to the risk assessment is demonstrated. The great complexity for meeting the requirements of the railway construction law and the environmental compatibility laws is challenged. The position of the board of experts becomes evaluated and criticized.
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