Abstract
The Northumberland Strait Bridge recently named the Confederation Bridge, is 12.9 km in length and crosses the Northumberland Strait between Prince Edward Island and New Brunswick. The 44 main bridge pier foundations are supported on circular and oval-shaped ring footings set on prepared bedrock foundations. Foundation preparation involved the removal by dredging of up to 15 m of overburden and weak rock in water depths of 14-40 m. A trial dredging program was carried out at three main piers to determine which bedrock materials could be dredged and to develop criteria for use in establishing dredging elevations at the remaining main pier locations. Results of the trial-dredging program were used to develop and compare methods of predicting the dredgeability of bedrock using the intact rock strength and rock mass properties. The trial dredging program was also used to develop procedures to verify that the dredged surface met both geotechnical and cleanup criteria. (A)
Published Version
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