The importance of modelling ballast particle shape in the discrete element method
The importance of modelling ballast particle shape in the discrete element method
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DOI：
10.1007/s10035-006-0021-3
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发表时间：
2007-01-01
期刊：
影响因子：
2.4
通讯作者：
McDowell, G. R.
中科院分区：
文献类型：
--
作者：
Lu, M.;McDowell, G. R.
离散元方法已用于对铁路道碴进行建模。使用球体和球体块对粒子进行建模。已经开发出一种简单的程序来生成团块，这些团块比球体更类似于真实的道碴颗粒。研究了团块形状对骨料内异质应力的影响，发现更多的角团块导致更大程度的均匀性。在一组球体和另一种团块上进行了箱式测试，该测试由压实后轨枕负载的一个周期组成。团块提供的联锁提供了比球体更真实的载荷变形响应，并且团块将成为未来循环载荷下道碴退化研究的基础。
The discrete element method has been used to model railway ballast. Particles have been modelled using both spheres and clumps of spheres. A simple procedure has been developed to generate clumps which resemble real ballast particles much more so than spheres. The influence of clump shape on the heterogeneous stresses within an aggregate has been investigated, and it has been found that more angular clumps lead to a greater degree of homogeneity. A box test consisting of one cycle of sleeper load after compaction has been performed on an aggregate of spheres and also on an alternative aggregate of clumps. The interlocking provided by the clumps provides a much more realistic load-deformation response than the spheres and the clumps will be the basis for future work on ballast degradation under cyclic loading.