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The foundation rock for the Dez Project is a Pliocene, limestone cobble conglomerate. The construction of a thin-arch dam on this young, heterogeneous material required a thorough understanding of its physical properties. The testing program included: 257 plate bearing tests, 85 in situ measurements of residual stress using the flat jack method, 2 large hydrostatic pressure chambers, and laboratory tests on 887 six-in.-diameter rock cores. The application of the principles of rock mechanics resulted in considerable savings in time and money on the Dez Project.
conglomerate rocks, plate bearing tests, residual stress, modulus of elasticity, flat jack tests, hydrostatic pressure chambers, rock mechanics, rock (material), dams, foundations
Dodds, R K
DirectorPersonal member ASTM, Foundation Sciences Co., Astoria, Ore.