RETC 2015: Discover the Latest Developments and Improve Your Ability to Put New Technologies into Practice. Every two years, industry leaders and practitioners from around the world gather at the Rapid Excavation and Tunneling Conference (RETC), the authoritative program for the tunneling profession, to learn about the most recent advances and breakthroughs in this unique field. Tunnels are getting larger, deeper, and excavated in more challenging conditions. The expectation for the industry is to successfully complete these projects while meeting the other heavy construction challenges of sustaining quality, schedule, performance, and safety. This comprehensive proceedings will help you keep up with the ever-changing and growing tunneling industry. It includes the full text of 113 papers presented at the 2015 conference, with case studies from projects in Istanbul, Lima, Lake Mead, and London, among others. Stay on top of new trends and technologies as well as innovative concepts, new equipment, materials, management, financing, and design challenges. A fully searchable CD containing the entire proceedings is included. Take a look into an enormous range of tunnel construction and reconstruction situations: Varied terrain: hard rock, soft ground, and mixed face conditions Varied purposes: to construct or rebuild tunnels for highways, rail lines (including one case that combined light and heavy rail), water and sewage systems, and a subterranean escalator for a luxury apartment building Varied project conditions presenting different engineering challenges: from the crowded layers of existing tunnels in Manhattan to the wide-open spaces of Alaska and Nevada Varied focus, as represented by the main tracks of the conference: caverns and large spans, contracting practices, design and planning, design-build projects, difficult ground, future projects, geotechnical considerations, ground support and final lining, grouting and ground modification, hard rock tunneling, major projects, new and innovative technologies, pressurized face TBM case histories, risk management, SEM/NATM, shafts, TBM technology, trenchless tunneling and rehabilitation, and tunnel safety and other challenges for the industry