Rock Mechanics Studies for Mossyrock Arch Dam

by David E. Kleiner, (A.M.ASCE), Head; Soil Mech. and Foundations Dept., Harza Engrg. Co., Chicago, IL,
Richard C. Acker, Head; Geology Dept., Harza Engrg. Co., Chicago, IL,

Serial Information: Journal of the Power Division, 1971, Vol. 97, Issue 1, Pg. 11-24

Document Type: Journal Paper


Foundation exploration for design included core drilling, borehole geophysical logging, and in-place bearing and shear tests. Laboratory tests included petrographic, unconfined compression, triaxial shear, and creep tests on rock cores. Borehole geophysical data proved to be valuable for stratigraphic correlation and for evaluating foundation rock elasticity characteristics. Comparisons of the values of the elastic modulus from geophysical in-situ and laboratory tests are useful but must be used in geologic context with judgment for foundation design. Differences between the predicted values of the modulus of elasticity and actual values as measured by foundation deformation meters are discussed and explained. The foundation rock response to excavation and construction of the dam and reservoir was monitored by acoustical borehole logging. Variations of the acoustic amplitude recorded qualitative evidence of opening and closing of foundation rock fractures during construction.

Subject Headings: Foundation design | Shear tests | Arch dams | Triaxial tests | Boring | Elastic analysis | Rock mechanics | Earthfill dams

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