... big. How it effects the stability of rock mass around cavern? What is the stress and deformation in rock mass around the bolts?. surge chamber elastic module rock bolt crane beam tailrace surge chamber deformation calculation MPa cavern excavation crane beam stability tangential...

... ABSTRACT: For some hydropower stations having a wide range of tailwater level, there will be many advantages if a small tailrace air cushion surge chamber is used to take the place of the conventional surge chamber. Generally, it can improve the stability of surrounding rock mass of openings...

... shafts are presented. Also unlined, closed surge chambers with compressed air cushions are briefly described. Such chambers with internal air pressure of up to 75 atmospheres on unlined rock is now in operation. Geological conditions which may have a serious influence on the behaviour of unlined pressure...

... SUMMARY: The air leaking out of air-cushion surge chambers has to be compensated for by stationary compressors. To predict the air loss, the Norwegian Geotechnical Institute has utilized a method developed by Tokheim and Janbu (1973). The paper presents calculations and measurements made...

... SUMMARY: The Jukla Pumped-Storage Power Project in Western Norway includes a 6,200 m3 compressed air surge chamber designed for operational air pressures between 6 bar and 24 bar. The paper describes the site investigations performed as a basis for chamber design. ZUSAMMENFASSUNG: Das...