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QUANTIFICATION OF THE GEOTECHNICAL AND ECONOMIC RISK IN TUNNELING
This paper discusses a consistent procedure to quantify geological, geotechnical and economic risk in tunneling. For an underground excavation a sound rock mass model and a systematic and quantitative rock mass characterization has to be developed. After defining key parameters, Rock Mass Types are determined and combined with influencing factors to obtain the behavior of the rock mass after excavation. A support and excavation concept is assigned to each Behavior Type, which allows an estimate of time requirement and costs. The probabilistic processing of distributed input data allows the determination of probability distributions for time and costs of a tunnel excavation based on the geotechnical risk and the variation of time and costs of different Excavation Classes.
Graz University of Technology, Institute of Rock Mechanics and Tunnelling