Tunnels

Tunnels driven in hard rock typically exhibits two types of instabilities; structurally controlled gravity-driven instability, and stress-induced instability resulting in rock bursts, spalling or slabbing. The design of tunnel support to limit instabilities requires detailed site investigation and laboratory testing of samples, in-situ testing and interpretation of geological and groundwater information, selection of design parameters and characterization of rock mass conditions as the underground excavation progresses. Typical support may range from spot bolts to full shotcrete or concrete lining to maintain stability for construction personnel and long term support for the service life of facilities. With respect to lake-tap tunnels, a high level of reliability is required for both tunnel alignment survey and lake bathymetry in the vicinity of the plug.

Engineering Design Services:

  • Feasibility studies and tunnel alignment studies;
  • Planning and execution of geotechnical site investigations including borehole drilling, core logging and geological mapping at the portals;
  • Geotechnical assessments and characterization;
  • Interpretation of in-situ test results including permeability, hydro-jacking and hydro-fracturing;
  • Design Basis and Criteria;
  • Portal, shaft, and tunnel design;
  • Tunnel stability analysis and support design;
  • Design drawings for construction;
  • Technical specifications;
  • Preparation of geotechnical interpretative and baseline reports;
  • Construction review reports; and
  • As-built condition documentation.

Construction Review Services:

  • Rock mass classification and geotechnical mapping;
  • Determination of rock support;
  • Tunnel support instructions (TSI) submission to the Contractor;
  • Construction risk mitigation solutions;
  • Site inspections; and
  • Evaluation of final lining requirements.

Coquihalla, Hope, BC

Mica Dam, Revelstoke, BC

McLymont Creek, Terrace, BC

Forrest Kerr, Terrace, BC
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