Large boulders entrained by debris flow can generate destructive impact force and cause significant damage to a rigid barrier located downstream. Baffle arrays can be installed in front of the rigid barrier to reduce the potential damage from large boulders by dissipating flow energy with filtering boulders from the debris flows. In this study, to investigate the effect of baffle arrays on the flow behavior and the dynamic impact force of debris flows acting on the terminal barrier, small-scale flume experiments were performed with various baffle configurations. After the experiments, the dynamic flow behavior with boulders, impact forces, and travel distances of boulders, were analyzed with transverse blockage ratios and numbers of baffle rows. As a result, entrained boulders in debris flows significantly increased impact force about six times. With the installations of baffle arrays, however, peak impact force decreased by an average of 70 % and by up to 94 %. In addition, increasing the number of rows of baffles from one to two led to an average reduction of 50 % in impact force for each transverse blockage ratio. However, in the case of one row of baffles, the impact force reduction for high s/δ values proved to be less effective compared to the other baffle configurations. Finally, the results of this study can provide appropriate ranges for the baffle spacing and the number of baffle rows in the baffle design to estimate the load attenuation due to boulder filtration.

中文翻译：

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泥石流夹带巨石的水槽调查，带有圆柱形挡板和刚性屏障


泥石流夹带的大石块会产生破坏性的冲击力，并对位于下游的刚性屏障造成重大损坏。挡板阵列可以安装在刚性屏障前面，通过过滤泥石流中的巨石来消散流动能量，从而减少大石块的潜在损害。在本研究中，为了研究挡板阵列对作用在终端屏障上的泥石流的流动行为和动态冲击力的影响，对各种挡板配置进行了小规模水槽实验。实验结束后，用横向堵塞率和挡板行数分析了巨石的动态流动行为、冲击力和巨石的行进距离。因此，泥石流中夹带的巨石显着增加了约 6 倍的冲击力。然而，安装挡板阵列后，峰值冲击力平均下降了 70%，最高可达 94%。此外，将挡板的排数从 1 排增加到 2 排，导致每个横向堵塞率的冲击力平均减少 50%。然而，在一排挡板的情况下，与其他挡板配置相比，高 s/δ 值的冲击力降低被证明效果较差。最后，本研究结果可以为挡板设计中的挡板间距和挡板行数提供合适的范围，以估计巨石过滤引起的载荷衰减。