Sökning: "tunnels in rock"
Visar resultat 1 - 5 av 53 uppsatser innehållade orden tunnels in rock.
1. Adapted data collection in field utilizing RMR and the Q-system
Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurserSammanfattning : The focus on slope stability has increased rapidly in Norway over the last years due to several unwanted landslides. In Norway, the most used method today to classify the rock mass and to determine the required reinforcement, is the Q-system. In addition to that the RMR method is also a commonly used method. LÄS MER
2. Rock Wedge Stability Assessment : A Comparative Analysis of Limit Equilibrium and Discrete Element Methods
Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurserSammanfattning : Rock wedge stability is a common concern in underground excavations. Since the wedge stability influences the support design, it is important to use a wedge stability analysis method that can capture factors like excavation geometry, joint parameters and properties, rock mass properties, rock cover, and stress field as accurately as possible. LÄS MER
3. Environmental and technical evaluation of cement reduction and test methods for fibre reinforced shotcrete in tunnels
Master-uppsats, KTH/BetongbyggnadSammanfattning : The dominating support method for hard rock tunnels today is use of fibre reinforced shotcrete in combination with rock bolts. The fibre reinforced shotcrete secures smaller blocks, while rock bolts are used to support larger blocks in the rock. Application of shotcrete is done by spraying against the rock surface using compressed air. LÄS MER
4. Optimization of support in rock pillars between two parallel tunnels
Master-uppsats, KTH/Jord- och bergmekanikSammanfattning : When two parallel tunnels are excavated under high to moderate horizontal in-situ stresses combined with minor deformations in the pillar between the tunnels, the in-situ stresses can be redistributed over the tunnels in form of two compressive arches and are transferred from the roof to the abutments of the two tunnels. At additional deformations in the pillar, a new redistribution of the stresses can occur creating one compressive arch over both of the tunnels. LÄS MER
5. Grundvattenbildning och inläckage till tunnlar - Samband i data från Förbifart Stockholm
Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Teknisk geologi; Lunds universitet/Väg- och vattenbyggnad (CI)Sammanfattning : För att förbättra framkomligheten och minska sårbarheten hos transportsystemet i Stockholmsregionen bygger Trafikverket genomfartsleden E4 Förbifart Stockholm. Vägen är till stor del förlagd i tunnel. LÄS MER