CE771. Rock Mechanics and Tunneling (ects: 4)

Rock Mechanics:
Design criteria and parameters: geological characterization of the position of the work, geological and geotechnical model, stress field, intact rock, discontinuities, rockmass, rockmass models, heterogeneous rockmasses, strength and deformability of rockmass, estimations reliability. Characteristic case studies from Greek and international literature. Discontinuities mapping, hydraulic properties, permeability. Tunnel classification systems (Terzaghi, RMR, Q, GSI) and semi-empirical design methods, areas of practice and limitations. Strength criteria: Mohr-Coulomb, Hoek-Brown. Stress and strain field around a deep circular tunnel. Development of strains along the tunnel axis. 
Tunneling:
Convergence - confinement curves calculation.  Excavation methods - selection criteria. NATM method, the observational construction method and full face boring excavation methods (TBM and EPB machines). Types of temporary support and final lining. Calculation of support pressure and final convergence for the temporary support. Excavations in rock, constructions in rock: basic slope failure mechanisms, rock slope stability, stability improvement methods. Tunnel protals.