<p><strong>Rock Engineering in Difficult Ground Conditions – Soft Rocks and </strong><strong>Karst</strong> contains the Proceedings of the Regional Symposium of the International Society for Rock Mechanics (ISRM), which was held 29 to 31 October 2009 in Cavtat near Dubrovnik, Croatia. It is a continuation of the successful series of regional ISRM symposia for Europe, which began in 1992 in Chester, UK. EUROCK 2009 was organized by the Croatian Geotechnical Society.</p><p><strong>Rock Engineering in Difficult Ground Conditions – Soft Rocks and Karst</strong> contains 7 keynote lectures and 129 papers classified in 7 themes as follows:</p><p>- Geological and hydrogeological properties of karst regions;</p><p>- Rock properties, testing methods and site characterization;</p><p>- Design methods and analyses;</p><p>- Monitoring and back analysis;</p><p>- Excavation and support;</p><p>- Environmental aspects of geotechnical engineering in karst regions; and</p><p>- Case histories.</p><p><strong>Rock Engineering in Difficult Ground Conditions – Soft Rocks and Karst</strong> will be of interest to professionals, engineers, and academics involved in rock mechanics and rock engineering.</p> Preface, Keynote lectures: Some rock mechanics aspects of subaqueous tunnels, Innovative tunneling construction method to cope with squeezing at the Saint Martin La Porte access adit (Lyon-Turin Base Tunnel), Metro construction at the most unfavourable depth caused a major metro station collapse in Brazil due to a unique sub-surface structure, Rock engineering for structures in unstable slopes, Tunnelling in overstressed rock, Stresses in rock masses: A review of key points, Site characterization and rock testing for the evaluation of design parameters. 1 Geological and hydrogeological properties of karst regions 2 Rock properties, testing methods and site characterization 3 Design methods and analyses 4 Monitoring and back analysis 5 Excavation and support 6 Environmental aspects of geotechnical engineering in karst regions 7 Case Histories