IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Practical formula to evaluate the rock stability under uniform or quasi ¨cuniform conditions
Practical formula to evaluate the rock stability under uniform or quasi ¨cuniform conditions
Author : RUI MARTINS (1), RITA F.CARVALHO (2)
ABSTRACT
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 : 232,542 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 26/08/2015
Download Now