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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Determination of critical shear stress of non-cohesive soils using submerged jet test and turbulent kinetic energy
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Determination of critical shear stress of non-cohesive soils using submerged jet test and turbulent kinetic energy

机译：利用水下射流试验和湍流动能确定非粘性土的临界剪切应力

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Laboratory tests using Jet Erosion Testing (JET) apparatus, impinging normally on a horizontal boundary, were conducted to determine the critical shear stress ((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 (c) of the samples. The results showed that TKE increases exponentially with increasing particle size. The (c) from this study were comparable (R-2=0.8) to the theoretical (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 (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 (TKEc) and samples' D-50 developed in this study can be used to predict (c) of non-cohesive soils under similar non-uniform conditions. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：进行了使用射流侵蚀试验（JET）装置的实验室测试，该实验通常撞击在水平边界上，以确定非粘性土壤样品的临界切应力（（c））。使用三维（3D）SonTek / YSI 16 MHz微声多普勒测速仪（MicroADV）来测量壁射流区域中夹带的径向极限处的湍动能（TKE），并使用这些测量值来计算（c ）的样本。结果表明，随着粒径的增加，TKE呈指数增长。由于床的不均匀条件，在计算了床的粗糙度比例（D / k）后，本研究的（c）与Shields图的理论（c）相当（R-2 = 0.8）对于。这项研究表明，JET和TKE可用于确定（c）非粘性土壤。与传统的使用水槽的方法相比，发现JET和TKE的使用更加便捷。初始运动开始时的TKE（TKEc）与本研究中开发的样品D-50的关系可用于预测（c）在相似非均匀条件下的非粘性土壤。版权所有（c）2015 John Wiley＆Sons，Ltd.

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