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In this communication we propose a way to estimate net thrust and torque applied at the excavation front by cutting tools from EPB machines when they are working in mixed faces constituted by soils and soft rock. The proposal is validated using a database of EPB registers which were gathered from more than 35km of tunnel drives excavated in soils, soft rock and heterogeneous media. The results allow us to assess the influence of the type of ground excavated and its geotechnical properties on the net thrust and torque applied.
CitationGonzález, C., Arroyo, M., Gens, A. Evaluation of net thrust and torque on mixed-face EPB drives. A: International Conference on Tunnel Boring Machines in Difficult Grounds. "Proceedings (USB) International Conference on Tunnel Boring Machines in Difficult Grounds". Singapur: 2015, p. 183-188.
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