Essays about: "bergbultar"

Found 4 essays containing the word bergbultar.

1. 1. Environmental and technical evaluation of cement reduction and test methods for fibre reinforced shotcrete in tunnels

   University essay from KTH/Betongbyggnad

   Author : Elin Brodd; Lina Östlund; [2022]
   Keywords : Shotcrete; Global Warming Potential; Environmental Product Declaration; Tunnel construction; Fibre reinforcement; Compressive strength; Residual strength; GGBS; Sprutbetong; Klimatpåverkan; Miljövarudeklaration; Tunnelbyggande; Fiberarmering; Tryckhållfasthet; Residualhållfasthet; Granulerad Masugnsslagg;

   Abstract : 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. READ MORE

3. 2. Optimization of support in rock pillars between two parallel tunnels

   University essay from KTH/Jord- och bergmekanik

   Author : Alexander Kote; Sohaib Ishaq; [2022]
   Keywords : tunnel; rock pillar support; rock pillar stability; rock mass; stresses; arching effect; Nyckelord: tunnel; bergförstärkning; bergpelare; bergmassa; spänningar; valveffekt;

   Abstract : 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. READ MORE

4. 3. Mesh Mounting Concept for a Mechanical Rock Excavation Machine

   University essay from KTH/Maskinkonstruktion (Inst.)

   Author : Elin Skoog; [2017]
   Keywords : mesh mounting; chain link mesh; rock reinforcement; mine tunnel support; nätmontering; stängselnät; bergförstärkning; tunnelförstärkning;

   Abstract : This report is the result of a Master’s Thesis done at the Machine Design Department at the Royal Institute of Technology. The project was carried out at Svea Teknik AB in cooperation with Atlas Copco Rock Drills AB and the Mining and Rock Excavation division in Örebro. READ MORE

5. 4. A parametric study of irregularly shaped shotcrete shells

   University essay from KTH/Betongbyggnad

   Author : Anders Beijer-Lundberg; [2009]
   Keywords : ;

   Abstract : The shape of a tunnel wall after the task of blasting and drilling is typically irregular. After the tunnel wall is sprayed with shotcrete, the resulting shotcrete surface will also be irregular and have a big variation in thickness due to uneven shotcrete coverage. READ MORE