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Showing result 1 - 5 of 93 essays matching the above criteria.

1. 1. Numerical modelling of high-speed railway transition zone

   University essay from KTH/Jord- och bergmekanik

   Author : Karl Norberg; [2022]
   Keywords : Railway geotechnics; Bridge; Ballastless track; Transition zone; High-speed railway; Finite element method; Track stiffness;

   Abstract : Transition zones are changes in the track structure, detected by an abrupt deviationin track stiffness and/or differential settlements. One inevitable transition zone is thebridge approach. This study has investigated in this transition zone, adapted for highspeed,ballastless track. READ MORE

3. 2. Back analysis of rock mass properties in the regional fault zone under Lake Mälaren

   University essay from KTH/Jord- och bergmekanik

   Author : Jiaqi Liu; [2022]
   Keywords : Rock mass property; back analysis; tunnel deformation; optimization algorithm; numerical analysis; Bergmassans egenskaper; bakåtanalys; tunnleldeformation; optimeringingsalgoritm; numeriska analyser.;

   Abstract : The properties of the surrounding rock mass in underground projects have significant impacts on the design and construction. However, it is quite challenging to evaluate rock mass properties due to the great uncertainties of the geological conditions. READ MORE

4. 3. Probabilistic settlement analysis for embankments using preloading without surcharge

   University essay from KTH/Jord- och bergmekanik

   Author : Karl Escher; [2022]
   Keywords : Bayesian statistics; uncertainty; geotechnical risk evaluation; preloading; consolidation; embankments; ground improvement; dependence modelling.;

   Abstract : Preloading without a surcharge is a common method for ground improvement. Thereare however uncertainties related to the number of site investigations and the partialfactor method has been identified as a problem. READ MORE

5. 4. Jet Grout Bottom Plug in Deep Excavations : Numerical Analysis of a Tunnel Project

   University essay from KTH/Jord- och bergmekanik

   Author : Ida Schjelderup; [2022]
   Keywords : Jet grouting; jet grout bottom plug; cut-and-cover tunnel; tunnel design;

   Abstract : This master thesis has investigated the performance of a deep excavation with a jet grout bottom plug used to prevent bottom heave and hydraulic uplift failure. The concept of a jet grout plug as a structural and sealing component in a specific case was studied, namely one of the tunnel sections of The West Link tunnel project in Gothenburg. READ MORE

6. 5. 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