MASSIVE ANNULAR GROUT AND LONG-DISTANCE PUMPING AT THE SEYMOUR-CAPILANO PROJECT

摘要

The Seymour Capilano Twin Tunnels Project in North Vancouver, British Columbia has two water tunnels, each 7.2km * 3.8m in excavated diameter. The tunnels receive a steel lining at each end that is up to 1400 m long. The annular space between the lining and the tunnel rock is filled with a grout required to meet stringent strength, shrinkage and peak temperature requirements. The development of the special grout used for backfilling the liner, and the methods and equipment developed for placing the grout over the full 1400m lengths of liner in a continuous operation is described. The test method developed to ensure the grout met structural requirements for the liner, what those requirements are and how liner capacity is affected by grout properties is also described. The paper gives recommendations for the specification of backfill materials with a focus on fluid properties which are critical to a successful backfilling operation.