Shear and Sliding Resistance Tests of Rock Joints for Forebay Dam-Grand Coulee Third Powerplant Project

摘要

Shear and sliding resistance tests were conducted in the Bureau of Reclamation laboratory and at Grand Coulee Dam, Wash, on 15- by 15- by 8-in. rock blocks to determine the apparent cohesion and sliding resistance of rock joints in the area of the Forebay Dam for the Third Powerplant. Laboratory tests utilized the 5-million-pound testing machine for the normal load and a 200-ton ram for the sliding (shearing) load. The in situ tests used a cable tensioned by a 60-ton ram for a normal load and another 60-ton ram for the sliding load. Movements were measured using displacement transducers and were recorded continuously on X-Y recorders. (Author)