A limit analysis of the kinematics of void collapse using the discrete element method
A limit analysis of the kinematics of void collapse using the discrete element method
复制标题
DOI：
10.1080/17486020701790904
复制
发表时间：
2008-02
期刊：
影响因子：
--
通讯作者：
W. Lim;G. McDowell
中科院分区：
文献类型：
--
作者：
W. Lim;G. McDowell
离散元模型的oedometer测试已被执行调查的运动学的空洞崩溃通过测量的空洞减少作为一个结果，完全去除颗粒在oedometer一个接一个。对于光滑的条件下，它被发现，体积变化，由于球被删除的oedometer是大约等于体积的球删除加上其相关的空隙空间。对于摩擦球，只有当土粒在固结仪中的形成达到恒定条件时，这一发现才成立。土屑在具有摩擦颗粒的样品中形成，并在固结计样品内产生稳定的空隙。土的膨胀程度一般随颗粒摩擦系数的增大而增大。然而，它被发现，在高的颗粒摩擦系数，与土壤的变形程度的相关性是弱的。已经表明，如果要准确地评估在体积测量仪中的空隙减少，则需要删除至少20个颗粒以获得每个删除的颗粒的空隙减少的良好平均值。同样重要的是，在提取任何孔隙减少数据之前，允许土壤湿度达到恒定条件。
Discrete element modelling of oedometer tests has been performed to investigate the kinematics of void collapse by measuring the void reduction as a result of completely removing particles in the oedometer one after another. For smooth conditions, it is found that volume change due to a ball being removed in an oedometer is approximately equal to the volume of the ball removed plus its associated void space. For frictional balls, this finding is only true once the formation of soil arching in the oedometer reaches a constant condition. Soil arching forms in samples with frictional particles and creates stable voids within the oedometer sample. The extent of soil arching generally increases with increasing coefficient of particle friction. However, it is found that, at high coefficients of particle friction, the correlation with the extent of soil arching is weak. It has been shown that if void reduction in an oedometer is to be evaluated accurately, at least 20 particles need to be deleted to obtain a good average of void reduction per particle deleted. It is also important to allow soil arching to reach a constant condition before extracting any void reduction data.