NUMERICAL ANALYSIS OF THE EROSION AND THE TRANSPORT OF FINE PARTICLES WITHIN SOILS LEADING TO THE PIPING PHENOMENON
NUMERICAL ANALYSIS OF THE EROSION AND THE TRANSPORT OF FINE PARTICLES WITHIN SOILS LEADING TO THE PIPING PHENOMENON
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DOI：
10.3208/sandf.50.471
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发表时间：
2010-08
影响因子：
3.7
通讯作者：
K. Fujisawa;A. Murakami;S. Nishimura
中科院分区：
文献类型：
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作者：
K. Fujisawa;A. Murakami;S. Nishimura
世界上大约 50% 的大坝溃坝是由管道引发的，这是堤坝决堤的主要原因。管道现象是由土壤颗粒的侵蚀及其在土体中的运输引起的。本文提出了一种采用土壤侵蚀速率概念来分析土壤内部侵蚀和侵蚀土壤颗粒迁移的数值方法。在这种分析中，考虑了孔隙液体的饱和-非饱和渗流、土壤颗粒与土壤结构的分离以及侵蚀颗粒的迁移，并对孔隙液体和侵蚀土壤颗粒的守恒相关方程进行了数值求解。该数值模拟可以获取孔隙度的时间变化和空间分布、颗粒尺寸分布、孔隙液体中分离土壤颗粒的浓度以及孔隙液体压力的分布。结果表明，该方法可以再现以往土壤内部侵蚀研究的实验数据，并通过数值实验定性预测土块和路堤等土壤内管道的典型发育，作为控制方程初始问题和边值问题的解。
About 50% of the world's dam failures are triggered by piping, which is a primary cause of embankment breaks. The phenomenon of piping results from the erosion of soil particles and their transport within a soil mass. In this paper, a numerical method is proposed to analyze the erosion within soils and the transport of eroded soil particles by adopting the concept of the erosion rate of soils. In such an analysis, the saturated-unsaturated seepage flow of the pore liquid, the detachment of the soil particles from the soil fabric, and the migration of the eroded particles are taken into consideration, and the equations related to the conservation of the pore liquid and the eroded soil particles are numerically solved. This numerical simulation allows for the procurement of the temporal alteration and the spatial distribution of the porosity, the particle size distribution, and the concentration of the detached soil particles in the pore liquid, as well as the distribution of pore liquid pressure. The results have revealed that the method can reproduce the experimental data from previous studies on the internal erosion of soils and that it qualitatively predicts, from the numerical experiments, the typical development of piping within soils, such as soil blocks and embankments, as the solutions to the initial and the boundary value problems of the governing equations.