Canadian Geotechnical Journal, Ahead of Print.
Baffle arrays are used to filter boulders from granular flows, such that the impact load exerted on barriers is reduced. However, current guidelines provide limited recommendations on baffle design. In this study, a calibrated discrete element method model was used to model boulders entrained in a bulk granular assembly interacting with baffles and a terminal rigid barrier. Different baffle spacings relative to the boulder diameter (1 < s/δ < 4) were considered. A ratio of s/δ = 1 is recommended for reducing the impact load by up to 80%, whilst s/δ = 4 renders an array of baffles inadequate for filtration. The optimum configuration is a staggered array with three rows of baffles on a horizontal plane in front of a barrier. This layout reduces the peak discharge by up to four times more than a similar array on sloping terrain, compared to channels without baffles. Furthermore, the transition from sloping terrain to a horizontal plane works together with the array of baffles to dissipate flow kinetic energy. On the horizontal plane, baffles attenuate the flow velocity more as the Froude number Fr increases, implying that baffles should be used if high Fr values are anticipated. Finally, guidance is provided on estimating load attenuation from boulder filtration.

中文翻译：

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在倾斜和水平地形上合理使用挡板阵列过滤巨石

加拿大岩土工程杂志，提前印刷。
挡板阵列用于从颗粒流中过滤巨石，从而减少施加在障碍物上的冲击载荷。然而，当前的指南对挡板设计提供了有限的建议。在这项研究中，校准的离散元方法模型用于模拟散装颗粒组件中夹带的巨石，与挡板和终端刚性屏障相互作用。考虑了相对于巨石直径的不同挡板间距 (1 < s/δ < 4)。建议使用 s/δ = 1 的比率将冲击载荷降低多达 80%，而 s/δ = 4 会使一系列挡板不足以进行过滤。最佳配置是在障碍物前面的水平面上具有三排挡板的交错阵列。这种布局与倾斜地形上的类似阵列相比，最多可将峰值放电减少四倍，与没有挡板的通道相比。此外，从倾斜地形到水平面的过渡与挡板阵列一起工作以消散流动动能。在水平面上，随着弗劳德数 Fr 的增加，挡板对流速的衰减更大，这意味着如果预计会有高 Fr 值，则应使用挡板。最后，提供了关于估计来自巨石过滤的负载衰减的指导。