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Operational analysis of a tunnel boring machine of the EPB type

Anagnostopoulos Ioannis

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Summary

The aim of the current diploma thesis is to calculate some of the parameters of the Tunnel Boring Machine which was used in the tunnel extension of Line 2 of the Athens Metro. The most important of the parameters is the specific energy defined as the energy expended in order to cut a unit volume of material and the energy expended for the stirring of the mud in-side the chamber and the work against frictional forces. Furthermore, the energy spent by the screw conveyor in order to remove the muck material was also calculated. The study area was focused on the Athens Metro line between Station Alimos and Station Argiroupoli. The data used for all the above, were obtained from the Attiko Metro S.A. company.This study also includes the technical description of the underground project as well as the geological, hydrogeological and technical properties of the soil. Subsequently, an extensive analysis was performed for the Tunnel Boring Machine (TBM) Earth Pressure Balance (EPB) which was applied for this specific underground project. Moreover, a realistic three dimensional model was set up for the Earth Pressure Balance (EPB) machine. The collected raw data were imported into a database and processed with appropriate mathematical equations that describe the basic functions of the EPB. As a result, the forces exerted on the cutter discs and knives, the specific energy and the energy expended for removing the muck material from the screw conveyor, were calculated.

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