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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 4- WATER ENGINEERING : PRACTICAL FORMULA TO EVALUATE THE ROCK STABILITY UNDER UNIFORM OR QUASI UNIFORM CONDITIONS
PRACTICAL FORMULA TO EVALUATE THE ROCK STABILITY UNDER UNIFORM OR QUASI UNIFORM CONDITIONS
Author : RUI MARTINS , RITA F.CARVALHO
Shields criterion often serves to analyse the stability of sediments, stones and armour units under uniform or quasi-uniform conditions. It is used to calculate the initial motion of loose material in a flow. It is simple and contains physical sense as relates shear stress on the bottom with material resistance function of its dimension and density. In this work the Shields formula is analysed. We look at (1) the action, (2) the Shields parameter and (3) material resistance, separately. We consider other formulas commonly used in hydraulic engineering and safety coefficients from the practice. Then we reach to a practical formula founded on theory to evaluate block dimensions. The proposed formula takes into account tested coefficients and presents admissible velocity of the flow as being a function of material dimension, material density and water depth.
File Size : 552,719 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 4- WATER ENGINEERING
Date Published : 19/04/2016
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