Premium
Determination of critical shear stress of non‐cohesive soils using submerged jet test and turbulent kinetic energy
Author(s) -
Sang Joseph,
Allen Peter,
Dunbar John
Publication year - 2015
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3710
Subject(s) - turbulence kinetic energy , turbulence , jet (fluid) , mechanics , geotechnical engineering , kinetic energy , shear stress , soil water , shear (geology) , critical resolved shear stress , entrainment (biomusicology) , materials science , geology , environmental science , physics , soil science , shear rate , composite material , acoustics , classical mechanics , rhythm , viscosity
Laboratory tests using Jet Erosion Testing (JET) apparatus, impinging normally on a horizontal boundary, were conducted to determine the critical shear stress ( τ c ) of non‐cohesive soil samples. A three‐dimensional (3D) SonTek/YSI 16 MHz Micro‐Acoustic Doppler Velocimeter (MicroADV) was used to measure turbulent kinetic energy (TKE) at a radial limit of entrainment in the wall jet zone and the measurements were used to calculate τ c of the samples. The results showed that TKE increases exponentially with increasing particle size. The τ c from this study were comparable ( R 2 = 0.8) to the theoretical τ c from Shields diagram after bed roughness scale ratio ( D / k s ), due to the non‐uniform bed conditions, was accounted for. This study demonstrated that JET and TKE can be used to determine τ c of non‐cohesive soils. The use of JET and TKE was found to be faster and easier when compared to the conventional approach of using flumes. A relationship of TKE at the onset of incipient motion (TKE c ) and samples’ D 50 developed in this study can be used to predict τ c of non‐cohesive soils under similar non‐uniform conditions. Copyright © 2015 John Wiley & Sons, Ltd.