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Tunnel Face Pre-injection

Stabilization of loose rock, rubble or soil in tunnel driving for protecting the team and equipment when driving tunnels or galleries

Preventive consolidation and stabilization of fault zones immediately in front of the heading face in tunneling and gallery driving

Used for

  • Shifted, unstable rock strata, rock folds or sedimentary rock
  • Loose rock mass, rubble, soil
  • Rock with a high void content, karst
  • Water-bearing strata and voids

In case of water ingress or pressurized in-situ water, additional waterstopping and sealing measures are necessary.

Materials adapted to the tunneling method:

  • Use of TBM: stabilization systems such as e.g. silicate resins
    • suitable for cutting and planing
    • non-stick properties
    • fast strength development
  • Conventional tunneling such as drilling and blasting or excavation: mostly polyurethane systems
    • fast strength development
    • flexibly adjustable
    • waterstop and sealing at the same time

Depending on the size of the fault zones, heading face stabilization, curtain injection, rock mass stabilization or void filling may be necessary.