Tunnels TBM and D&B

Tunnel projects for both civil works and mining are setting increasingly demanding and challenging construction requirements worldwide.

In planning an appropriate tunnel route, it is often not economically feasible to investigate the route in as much detail as would be desired from a geotechnical point of view. In such cases, skill and experience in interpreting tunneling conditions are essential. This includes the analysis of the interaction between the stresses acting on the tunnel, whether static or dynamic, and analysis of the freedom of movement of rock blocks. Inadequate interpretation can lead to inadequate support specification and design. In civil engineering this can be a source of significant claims whereas in mining, tunnels often have to be re-supported or redeveloped at considerable cost.

SRK's engineering geologists and geotechnical engineers are skilled in the interpretation of geological conditions, in the evaluation of potential rock loading, and in the analysis of tunnel stability.

We design site investigations that provide the optimum amount of information:  

Rock/support interaction, including both rock reinforcement and concrete/shotcrete linings, is analyzed using numerical stress analysis techniques. In this way, appropriate support corresponding with the loading conditions is designed. Involvement of both geologists and engineers in the interpretation process is considered to be extremely important for developing a thorough understanding of expected tunneling conditions.

Management of Quality Control is applied during all phases of tunnel construction and rock excavation, enabling our team to provide practical solutions focused on both technical and economic optimization of projects. SRK's Quality Control Program ensures that the service provided is of the highest possible standard, and is accepted by banks and lending institutions worldwide.

Services:

  • geological and geotechnical conditions are interpreted from the field mapping data and borehole logs
  • rock mass classifications are carried out using Barton's Q system and Bieniawski's RMR system for civil tunnels, and Laubscher's mining rock mass rating system for mining development
  • rock loadings are determined from classifications, from rock block kinematic evaluations, from numerical stress analyses, and from dynamic considerations
    • Feasibility and planning studies
    • Geological mapping
    • Geotechnical investigation
    • Rock mass characterization
    • Designs and Layouts of Works
    • Underground excavation and support design
    • Design of excavation linings
    • Access design
    • Drill and blast design
    • Ventilation
    • Predicting and managing interaction between underground work and groundwater with surface works
    • Instrumentation/Equipment selection
    • Cost estimations and risk evaluation for underground works
    • Numerical modeling and analysis, manipulation of graphical data in 2D and 3D, through use of Surpac and other software
    • Risk and hazard assessment and management
    • Detailed engineering and procurement
    • Contract documentation based on risk concept allocation between client and contractor
    • Project management and construction administration
    • Operational monitoring and management
    • Construction supervision and quality assurance
    • Permitting and regulatory compliance
    • Risk and hazard assessment

 

Contacts for this service

SRK Latin America