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Statistical investigations of TBM data and rock parameters have shown that interactions determined theoretically or in the laboratory are often not realistic because the interaction of the machine with the rock mass is considerably influenced by the type of machine in use, the machine driver and the characteristics of the rock mass. Evaluations of excavation data have shown that the maximum net advance rate is not produced by the maximum thrust force, even in the same rock type. Individualised optimisation of the interaction on the basis of continuously recorded machine data and basic information about the rock mass (type of rock, degree of jointing), which can be determined by geological and geophysical investigations during tunnelling, is therefore of particular significance for economical tunnelling. The evaluation of these data should not replace but rather supplement the control of the machine by the driver. IntroductionPublications have described many ways in which the machine interacts with the rock mass, including: -sticking of the machine in squeezing rock [28] The following discourse attempts to analyse the interaction of machine and rock mass using selected machine data and rock mass parameters in relation to thrust force, advance rate and vibration according to the rock mass characteristics.2 Dependency of the advance rate on the structure of the rock mass

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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.