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  ATG Ceneri Base Tunnel Driving Method and Producti on of Concrete Aggregates

  The inclusion of the idea of reuse into the overall process from planning to implementation is a central concern in underground projects. The maximum reuse of excavated tunnel material is important for several reasons. It can save material resources, reduce transport distances and landfill volumes and, last but not least, construction costs on a large scale. Aggregates for concrete can be produced with raw material resulting from both mechanized and drill and blast driving methods. The different production yields and quantities of waste materials have a major influence on the supply rate and on the requirements for the deposit sites. Using an extensive database constructed for the AlpTransit Ceneri Base Tunnel (15.4 km), the influence of the driving method and the production process of aggregates for concrete was analysed to predict the expected aggregate quantities and waste materials, such as sludge, polluted material or excess aggregate fractions. This information is useful both for quantifying the material recycling rate and for optimizing processing and disposal costs.

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