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首页> 外文期刊>Canadian Geotechnical Journal >Pressure conditions in the hole erosion test
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Pressure conditions in the hole erosion test

机译：孔蚀试验中的压力条件

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摘要

The hole erosion test (HET) is used in the study of soil erosion in the case of what is known as "piping" when concentrated leaks occur. The HET enables the determination of soil erosion characteristics such as the critical shear stress along the pre-formed hole (pipe) and the coefficient of soil erosion. Normally, in the HET, the hydraulic gradient is determined from the difference between the piezometric heads measured at the inflow and outflow chambers (upstream and downstream of the soil specimen). Hydraulic analysis shows that such measurements ignore losses at the entrance and exit of the hole, causing the overestimation of the hydraulic gradient along the length of the hole, and thus the calculated shear stress. In this technical note, the results of preliminary analysis using the Bernoulli principle and of numerical study of the pressure conditions in the HET apparatus are shown. The turbulent flow in the HET apparatus was calculated using ANSYS commercial CFD (computational fluid dynamics) software. The analysis was performed for various hole entrance shapes. The conclusion of this note details the differences between traditionally determined hydraulic gradients and those numerically derived along the length of a hole.
机译：当发生集中泄漏时，在所谓的“管道”情况下，将孔蚀试验（HET）用于土壤侵蚀研究。 HET能够确定土壤侵蚀特征，例如沿预制孔（管道）的临界剪切应力和土壤侵蚀系数。通常，在HET中，水力梯度是根据在流入和流出室（土壤样本的上游和下游）测得的测压头之间的差确定的。水力分析表明，这种测量忽略了孔的入口和出口处的损失，从而导致沿孔的长度对水力梯度的估计过高，从而导致了计算应力的高估。在本技术说明中，显示了使用伯努利原理进行的初步分析结果以及对HET设备中压力条件进行数值研究的结果。使用ANSYS商业CFD（计算流体动力学）软件计算HET设备中的湍流。针对各种孔入口形状进行了分析。该注释的结论详细介绍了传统确定的水力坡度与沿孔长沿数值推导的水力坡度之间的差异。

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