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estimation of tunel excavation time as a function of the configuration of…

- - - - excavation time.
- - - - probability density function for every unit operation
      - tunnel excavation time
        
        most favorable for tunnel construction
      - drilling
        
        all the activities have variations that depend on
        unforeseen events
      - loading explosives &
        blast
      - ventilation
      - scaling
      - mucking
  - - - efficiency of the blasting
        
        conditions of the
        rock
        
        structures
        
        explosives
        
        blast planning
      - drilling equipment
- - - - excavation
        cycle.