| 滑坡碎屑堆积体形成泥石流的实验 |
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| 引用本文： | 亓星,余斌,朱渊.滑坡碎屑堆积体形成泥石流的实验[J].吉林大学学报(地球科学版),2014,44(6):1950-1959. |
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| 作者姓名： | 亓星 余斌 朱渊 |
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| 作者单位： | 成都理工大学地质灾害防治与地质环境保护国家重点实验室，成都610059 |
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| 基金项目： | 国家自然科学基金项目，中国地质调查局地质大调查项目 |
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| 摘 要： | 地震或强降雨诱发滑坡，滑坡体碰撞解体形成碎屑物质堆积在沟道内，在后期降雨作用下形成泥石流，这是泥石流形成的一种方式，可称为滑坡碎屑堆积体泥石流。笔者分析了影响碎屑堆积体泥石流起动的特征参数，通过实验研究了碎屑堆积体泥石流形成的过程，分析了堆积体表面坡度、黏粒质量分数、中值粒径（d50）以及不均匀系数（Cu）对泥石流形成的影响。结果表明：碎屑堆积体表面坡度对形成泥石流所需单宽流量无明显影响；黏粒质量分数在不大于5%时仅影响碎屑堆积体侵蚀，对碎屑堆积体揭底所需单宽流量无明显影响；影响碎屑堆积体形成泥石流所需单宽流量的因素主要为中值粒径和不均匀系数--随堆积体中值粒径、不均匀系数的增大而增大。通过实验数据拟合得出了中值粒径和不均匀系数与泥石流形成和揭底所需单宽流量的公式；由于公式中只考虑了影响碎屑堆积体形成泥石流的两个主要因素（d50和Cu），因此对比水文计算结果偏小，但整体趋势基本一致。在实际应用到这类泥石流沟时，可通过修正进行预测。
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| 关 键 词： | 碎屑堆积体 泥石流 颗粒级配 起动流量 滑坡 |
| 收稿时间： | 2014-04-26 |
Experimental Study on the Clastic Deposition Forming Debris Flow |
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| Qi Xing,Yu Bin,Zhu Yuan.Experimental Study on the Clastic Deposition Forming Debris Flow[J].Journal of Jilin Unviersity:Earth Science Edition,2014,44(6):1950-1959. |
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| Authors: | Qi Xing Yu Bin Zhu Yuan |
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| Institution: | State Key Laboratory of Geo-Hazards Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu610059，China |
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| Abstract: | Earthquake or strong rainfall can induce landslides. The landslide collapses to form clastic flow accumulation in the channels, forms debris flow under the action of the later rainfall. This is a type of debris flow which is called the landslide clastic accumulation of debris flow. The authors analyse characteristic parameters of the influence on starting of clastic accumulation of debris flow, research the information process of the landslide clastic accumulation of debris flow on the basis of experiments, and then analyse the influence of clastic accumulation surface slope, soil clay content, median grain size and non-uniformity coefficient on the formation of debris flow. The results show that the surface slope of clastic deposition have no significant effect on forming debris flow with discharge per unit width. The clay content are only affect clastic erosion at not more than 5%. It has no significant effect on digging up discharge per unit width. The main influence factors of required discharge per unit width are median diameter and non-uniformity coefficient width are increased with the increase of median diameter and non-uniformity coefficient. By fitting the experimental data, the formula of unit width discharge is obtained, which reflects the influence of median particle size and non-uniformity coefficient. For the formula only two main factors are considered width influence the formation of debris flow (d50 and Cu). Therefore, the calculation results is smaller than hydrological calculation, but the overall trend is consistent. The formula can be applied in predicting this kind of debris flow after modificatin. |
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| Keywords: | clastic deposition debris-flow grading initiation flow landslide |
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