SUN Hao,YOU Yong,LIU Jinfeng,et al.Experimental Study on Sediment Size Regulating of Beam Type Debris Flow Check Dam[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):1037-1044.
SUN Hao,YOU Yong,LIU Jinfeng,et al.Experimental Study on Sediment Size Regulating of Beam Type Debris Flow Check Dam[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):1037-1044. DOI: 10.13409/j.cnki.jdpme.2020.06.024.
Experimental Study on Sediment Size Regulating of Beam Type Debris Flow Check Dam
Beam dam, which is an open-type check dam, has a good application in debris flow hazard mitigation. In this paper, a series of flume experiments were conducted to investigate the characteristics of the beam type debris flow check dam on sediment size regulating. The grain compositions before and after debris flow passing through the beam dam were obtained by the oven and vibrating screen. The experimental results reveal that the beam type debris check dam has high performance on size regulating. But it performs relatively low regulating efficiency for debris flow with high bulk density in which the water and blocks are difficult to be separated. Analysis result supports that the regulating capacity of the beam dam depends on the bulk density. Secondly, a new evaluation index considering grain size was proposed and compared with the common index in the previous studies. The analysis indicates that the regulating efficiency decreases first and then increases with the increase of relative opening, and reaches the minimum value at a relative opening of about 1.5. Furthermore, based on the experimental data, a calculated formula for sediment size regulation was obtained. It can provide a reference for practical engineering. Additionally, the regulating effect also was influenced by the blocking performance in the tests.
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