METHODOLOGY

Photo-optical technologies, x-ray, gamma-ray and microwave units will be used to analyse the continuous mass flow of material directly behind the cutter head. This automated online sampling and characterisation of physical, chemical and mineralogical properties provides the basis for assessing the suitability of the excavated material for different use options.
A downstream underground separation plant will handle the material depending on the online test results and requirements for intended use either as concrete aggregates on site or in various other sectors. All systems will be mounted directly on the backup system of the tunnel boring machine and will thus need to be adapted to the harsh environmental conditions and space restrictions underground.
Methods of Life Cycle Assessment (LCA) and Mass Flow Analysis will be used to compare different scenarios of use or disposal of the excavation material.

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