Essays about: "bergmassa"

Showing result 1 - 5 of 8 essays containing the word bergmassa.

  1. 1. Analysis of rock grouting with variable injection pressure

    University essay from KTH/Hållbar utveckling, miljövetenskap och teknik

    Author : Zhuohang Lian; [2022]
    Keywords : Rock engineering; Rock grouting; Variable injection pressure; Dynamic grouting technique;

    Abstract : Rock grouting is an effective technique frequently used in rock engineering to reduce  groundwater ingress and increase the stability of surrounding rock mass. The real time grouting control (RTGC) is one of widely used  analytical models to predict the grouting process. 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. Extraction of Backfilled Tailings in the Dannemora Mine – Economic Potential and Rock Stability Assessment

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : John Winlund; [2022]
    Keywords : backfilled tailings; Dannemora mine; iron ore; rock stability; stopes; återfylld anrikningssand; Dannemoragruvan; järnmalm; bergstabilitet; öppna brytningsrum;

    Abstract : The cut-off grade determines what rock mass are economic to mine. At the Dannemora mine, in eastern Bergslagen, Sweden, previously processed ore generated tailings (enrichment sand) with an iron content of 21-22 % that was backfilled into large open bodies (stopes) in the mine between 2013-2015. READ MORE

  5. 4. State of the Art Report on Cement Based Grout Properties and Dynamic Grouting

    University essay from KTH/Jord- och bergmekanik

    Author : Bowen Meng; [2021]
    Keywords : Dynamic grouting; filtration; rheology; grouting phase;

    Abstract : Dynamic grouting in rock mass has been studied since 1985 while desired penetration in rock masses with fine fractures is still a challenge because of uncertainty and complexity in the grouting process. This has attracted the attention of researchers in different countries and regions, especially in some Nordic countries such as Sweden. READ MORE

  6. 5. Elastic properties of the Singö zone from a discrete approach

    University essay from KTH/Skolan för arkitektur och samhällsbyggnad (ABE)

    Author : Amanda Åkerlind; [2019]
    Keywords : Elastic properties; deformation zones; Forsmark; Singö zone; DFN; Deformationsegenskaper; deformationszoner; Forsmark; Sinözonen; DFN;

    Abstract : A rock mass is characterised by the properties of the intact rock and the fractures. Considering the impact of both constituents is of vital importance for assessing the behaviour of the rock mass. In particular in the case of complex or heterogeneous rock mass compositions. READ MORE