Essays about: "Tunnels"

Showing result 11 - 15 of 125 essays containing the word Tunnels.

1. 11. 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

3. 12. EVALUATION OF ENVIRONMENTAL AND TECHNICAL PERFORMANCE OF ALTERNATE FIBRES FOR SHOTCRETE IN TUNNELS

   University essay from KTH/Betongbyggnad

   Author : Shilpa Anand; [2022]
   Keywords : Shotcrete; Life cycle assessment; Environmental Product Declaration; Global warming potential; steel; basalt and synthetic fibres; flexural strength; energy absorption.;

   Abstract : Tunnels in hard and jointed rock are normally excavated in an arch shape to enable the rock mass to support its weight. Since the beginning of the 1980's, fibre reinforced shotcrete (FRS) in combination with rock bolts have been the dominating support method for hard rock tunnels. READ MORE

4. 13. U - Net Based Crack Detection in Road and Railroad Tunnels Using Data Acquired by Mobile Device

   University essay from KTH/Geoinformatik

   Author : Kepan Gao; [2022]
   Keywords : U-Net; deep learning; tunnel monitoring; structural health monitoring; crack detection; mobile mapping system;

   Abstract : Infrastructures like bridges and tunnels are significant for the economy and growth of countries, however, the risk of failure increases as they getting aged. Therefore, a systematic monitoring scheme is necessary to check the integrity regularly. READ MORE

5. 14. Economic Effects of Megaprojects on Income Levels - Empirical Evidence from a Case Study of the Channel Tunnel and the United Kingdom

   University essay from Handelshögskolan i Stockholm/Institutionen för nationalekonomi

   Author : Julius Meyer; [2022]
   Keywords : Channel Tunnel; International Fixed Link; Megaproject; Synthetic Control Method; United Kingdom;

   Abstract : Although the number of megaprojects implemented worldwide is increasing, there are still only a few significant international infrastructure megaprojects such as bridges or tunnels between countries. Due to cost explosions and overly optimistic forecasts for the use of bridges or tunnels, cost-benefit analyses often turn out to be negative. READ MORE

6. 15. Groundwater Inflow into Fractured Rock Tunnels

   University essay from KTH/Hållbar utveckling, miljövetenskap och teknik

   Author : Mariam Beydoun; [2022]
   Keywords : groundwater inflow; rock tunnel; discrete fracture networks; discrete fracture-matrix; equivalent porous medium; Darcy’s Law; Reynold’s equation; cubic law; grundvatteninflöde; bergtunnel; discrete fracture networks; discrete fracture-matrix; equivalent porous medium; Darcy’s Law; Reynolds equation; cubic law;

   Abstract : Groundwater inflow is a challenge in construction of tunnels in fractured bedrocks since it affects the safety function of tunnels and leads to potential problems in the surrounding environment, such as subsidence, dropdown of the groundwater table. Quantification of groundwater inflow into the tunnel is also important for design of grouting in the construction of the tunnel. READ MORE