ABSTRACT
Tunnel projects are required to be executed in an appropriately planned sequence if they are expected to be successful and not associated with major delays. A project execution plan including a total project schedule is recommended to be prepared by the developer or client upon conceptual realization for a new rock tunnel to address all of the key requirements for a successful completion. An environmental study is commonly commenced and performed by an independent consultant under the direction of the client shortly after or concurrently with project definition. For some tunnel projects additional specialist sub-consultants commonly form part of the design team for geotechnical, environmental, hydraulics and possibly mechanical and electrical services. The preliminary and final design deliverables of each milestone should include design drawings, and opinion of probable construction costs and construction schedules. Constructability reviews should be undertaken at each stage of design to evaluate the overall feasibility of the entire construction approach for the project.
