考虑摩擦系数和颗粒强度劣化效应的堆石体湿化细观数值模拟

发布时间：2019-07-21 14:24

【摘要】：堆石体遇水之后,水的润滑作用会导致颗粒之间的滑移和重新排列,水的软化作用则会导致颗粒破碎增加。在考虑颗粒破碎的连续-离散耦合分析方法(FDEM)中,引入代表水对于堆石体颗粒间摩擦系数和颗粒强度劣化作用的湿化模型,并按照室内单线法湿化试验的步骤进行了一系列数值试验。数值试验得到的湿化轴向应变与室内试验结果接近,表明水对于颗粒间摩擦系数和颗粒强度的劣化作用是产生湿化轴向应变的主要原因,堆石体颗粒间摩擦系数的降低是引起湿化轴向应变的主要原因,其次是颗粒强度的降低。湿化过程中的颗粒破碎分布呈现出局部集中的现象。湿化后颗粒之间的法向接触力平均值略有增加而切向接触力平均值则下降明显。
[Abstract]:After the rockfill is exposed to water, the lubrication of water will lead to the slippage and rearrangement between the particles, and the softened effect of water will lead to the increase of particle breakage. In (FDEM), a continuous-discrete coupling analysis method considering particle breakage, a humidification model representing the friction coefficient and particle strength deterioration between particles of rockfill is introduced, and a series of numerical experiments are carried out according to the steps of laboratory single-line humidification test. The axial strain of humidification obtained by numerical test is close to that of laboratory test, which shows that the deterioration of friction coefficient and strength between particles by water is the main reason for the axial strain of humidification. The decrease of friction coefficient between particles of rockfill is the main cause of axial strain of humidification, followed by the decrease of particle strength. The distribution of particle breakage in the process of humidification shows the phenomenon of local concentration. After humidification, the average normal contact force between particles increased slightly, while the average tangential contact force decreased obviously.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金资助项目(51322905,51579193,51509190) 中国博士后科学基金面上资助(2016T907272)
【分类号】：TV41

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