... pressure tunnels. Such approach may help replace the traditionally used concrete and steel lined pressure tunnel systems, which are both cost intensive and long construction time taking. Nevertheless, there are several technical, geological and geo-tectonic challenges associated to this solution, which...

... Abstract The transition zone, i.e. where the pressurized water enters the steel lined section of the waterway, is a key component of the entire tunnel system in any underground hydropower project utilizing unlined pressure tunnels. Not only is it important for conveying the pressurized water...

.... Since, the traditionally used fully concrete lined waterway system has proven to be costly solutions, innovative solutions are needed to reduce the fully concrete lined length of the pressure tunnels. However, the solutions applied must guarantee long-term stability and sustainability, cost...

... ABSTRACT: The design of lining and un lining of a water pressure tunnel is carried out through the detailed estimation of rock mechanical and hydrological factors and the establishment of the design guideline. The field investigation for rock mass rating and joint pattern, laboratory rock test...