谢湘平,王小军,屈新,等.2020.缝隙坝对携带漂木的泥石流减灾效果实验研究[J].工程地质学报,28(6):1333-1343.doi: 10.13544/j.cnki.jeg.2020-130.
    引用本文: 谢湘平,王小军,屈新,等.2020.缝隙坝对携带漂木的泥石流减灾效果实验研究[J].工程地质学报,28(6):1333-1343.doi: 10.13544/j.cnki.jeg.2020-130.
    Xie Xiangping,Wang Xiaojun,Qu Xin,et al.2020.Experimental study on mitigation effect of slit dam to debris flow with driftwood[J].Journal of Engineering Geology,28(6):1333-1343.doi: 10.13544/j.cnki.jeg.2020-130.
    Citation: Xie Xiangping,Wang Xiaojun,Qu Xin,et al.2020.Experimental study on mitigation effect of slit dam to debris flow with driftwood[J].Journal of Engineering Geology,28(6):1333-1343.doi: 10.13544/j.cnki.jeg.2020-130.

    缝隙坝对携带漂木的泥石流减灾效果实验研究

    EXPERIMENTAL STUDY ON MITIGATION EFFECT OF SLIT DAM TO DEBRIS FLOW WITH DRIFTWOOD

    • 摘要: 山洪泥石流灾害中携带漂木的情形时有发生,漂木产生的灾害效应也越来越受到关注,但现有泥石流防治工程多未考虑漂木的影响。因此,有必要对漂木存在条件下拦砂坝的调控效果进行研究。以缝隙坝为例展开模拟实验,结果表明泥石流中携带漂木时,漂木多运动在流体表面,且先于泥沙到达坝前,是否在缝隙坝开口处形成漂木堵塞体对缝隙坝前泥沙堆积体形态、泥沙流出率、漂木拦截率均有重要影响。若未形成漂木堵塞体,坝前泥沙堆积体有明显侵蚀槽,泥沙流出率较无漂木时略低;一旦形成漂木堵塞体,坝前泥沙堆积体无明显侵蚀现象,泥沙流出率显著减小,漂木总拦截率显著增大。缝隙坝对不同漂木组分的拦截效果不同,漂木长度L与缝隙开口宽度b的比值L/b越大,越容易被拦截。漂木中L/b>1的组分含量越大,漂木总拦截率越大,且L/b>1的漂木存在是形成堵塞体的关键条件。

       

      Abstract: Mountain torrents and debris flows carrying with driftwood are common in nowadays. The damage caused by driftwood has increased in recent years. However, there are few researches about the effect of driftwood in present prevention works for debris flow. Therefore, it is necessary to study the mitigation effect of debris flow check dams with driftwood. Taking the slit dam as an example, we carried out a series of physical model tests. The results show that the driftwood always moves on the surface of the fluid and arrives at the dam before sediment. Whether driftwood accumulates at the openings of the slit dam, it has a significant influence on the sediment deposition in front of the dam, the sediment outflow rates, and the retention rates of driftwood. Without driftwood accumulation, obvious erosion takes place on the sediment deposition before the dam by subsequent flow. Sediment outflow rates are slightly lower than that without driftwood. Once a driftwood accumulation is formed, the sediment deposition in front of the dam has no obvious erosion. The sediment outflow rates obviously decrease, while the total retention rates of driftwood increase remarkably. The retention rates of different driftwood components are various with the difference of driftwood length. The larger the length-width ratio L/b(L:the driftwood length, b: the opening width of slit dam) is, the easier the retention of driftwood is. The total retention rates of driftwood increase along with the increase of the amount of the driftwood with L/b>1. In addition, the existence of the driftwood with L/b>1 is a key condition for the formation of driftwood accumulation.

       

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