Fluidisation in artesian flow conditions: Hydromechanically unstable granular media
Fluidisation in artesian flow conditions: Hydromechanically unstable granular media
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自流条件下的流化：流体力学不稳定的颗粒介质
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
I. Vardoulakis
中科院分区：
文献类型：
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作者：
I. Vardoulakis
目前的分析集中在流体力学不稳定的颗粒材料在自流条件下的流态化和侵蚀过程，正如Skempton和Brogan在间隙级配土壤的柱试验中记录的那样。结果表明，水力电阻率的异常下降可归因于土壤细粒的流态化，最终导致孔隙空间的堵塞和以失控不稳定形式存在的分离管道侵蚀。为了描述侵蚀过程，提出了由静止颗粒、输运颗粒和孔隙流体组成的三相介质的连续介质理论。建立了控制质量平衡方程和动量平衡方程，并根据实验数据讨论了颗粒冲蚀本构关系。
The present analysis focuses on fluidisation and erosion processes involving hydromechanically unstable granular materials in artesian flow conditions, as these phenomena were documented in column tests with gap-graded soils by Skempton & Brogan. It is shown that the observed abnormal decrease in hydraulic resistivity can be attributed to fluidisation of the fines fraction of the soil, which eventually leads to unplugging of the pore space and segregation piping erosion in the form of a runaway instability. For the description of the erosion process a continuum theory for three-phase media consisting of stationary grains, transported grains and pore fluid is presented. The governing mass balance and momentum balance equations, and the constitutive law for particle erosion are formulated and discussed in the light of the experimental evidence.