Keynote lectures: The nature of special conditions in underground construction -- Geological Strength Index (GSI) : a characterization tool for assessing engineering properties for rock masses -- Technical papers: Hard rock bursting phenomena in Maule tunnel (Chile) -- Ground reaction curves of tunnels considering post-peak rock mass properties -- Passage of the Cariǫ fault in the terrestrial emissary "A Malata - EDAR Prioriǫ Cape" -- Design and construction of the Telleda Tunnel -- Safety in tunneling machines -- Rehabilitation of Lapa tunnel, Metro do Porto -- Evaluation of the deformation modulus of rock masses using RMR : comparison with dilatometer tests -- Geotechnical behaviour of shaly rocks crossed by the Pajares tunnels (Section 1) -- The selection of a cutter for a tunnel boring machine and the estimation of its useful life -- Field test study on the endurance of early embedded bolts -- Evaluating the ground pressures on the TBM and the lining for the Guadarrama base tunnel -- Crossing of fault zones in the MFS Faido by using the observational method -- Improving the reliability of GSI estimation : the integrated GSI-RMI system -- Effect of lower seam old workings on longwall powered supports in upper seam -- Modelling and validation of ground behaviour in a very old tunnel rehabilitation -- Instability assessment of a deep ramp influence on the surrounding exploitation openings in a copper mine -- Calculation of the pre-stressed anchorage by 3D infinite element.