Get Concrete Face Rockfill Dams Design, Construction, and PDF

By J. Barry Cooke, James L. Sherard

ISBN-10: 0872625036

ISBN-13: 9780872625037

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Additional resources for Concrete Face Rockfill Dams Design, Construction, and Performance: Proceedings of a Symposium

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For the SCT presented here with Rs/v = 36 m-1instead of 20 for blocks, we will have increased compaction energy dissipation for cylindrical samples than for blocks. Furthermore, by modifying the device, we can compress the top part and keep the base, which is no longer subjected to the same forces as the SCT, fixed; friction is evaluated through a differential measurement of the force between the top and the bottom of the sample. The energy dissipated through friction may result in a 50% decrease in compaction force at the base of the sample for old steel molds, and almost zero if the steel surface is new.

Blocks have an even smaller aspect ratio. The difference in dry density of the sample, measured by gamma densitometry, does not exceed 1% in the case of double compaction. 3. 3 For manufacturing blocks, the Rs/v = Sc/v ratio – contact area over compacted soil volume – is around 20 m–1; for the cylindrical sample, it is around 36 m–1. 8. [VEN 93] chose a static compaction laboratory test with set displacement to get a constant volume (final volume of the block) in order to be consistent with what happens in this type of block press.

Particularly for stones like shale, shearing can produce yield, which makes its study necessary. Block on block shearing is a difficult mechanism to model as it involves varied and complex phenomena: attrition, physicochemical interactions and third body production. However, a simple and old law that provides a good match with experimental results is Coulomb’s law of friction [COU 73]. It is this law that we will use in the model in Part 3. According to Coulomb’s law of friction, the shear stress required to set a solid in motion is proportional to normal stress.

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Concrete Face Rockfill Dams Design, Construction, and Performance: Proceedings of a Symposium by J. Barry Cooke, James L. Sherard

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