稀性泥石流冲击力随机分布特征实验研究

doi:10.13722/j.cnki.jrme.2017.0828

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摘要

泥石流的冲击力具有很强的随机性。为研究泥石流冲击力变化规律、随机分布特征及冲击力与粗颗粒的关系，用云南蒋家沟泥石流原状土开展7组大型稀性泥石流冲击力水槽实验。实验结果表明：(1) 泥石流冲击力比例系数随粗颗粒无量纲最大粒径增大而增大，二者之间存在良好指数经验关系；(2) 用6种概率密度函数拟合了泥石流冲击力的分布，发现Log-Logistic函数最适合描述冲击力的分布；(3) 冲击力分布的Log-Logistic函数的尺度参数和形状参数随粗颗粒无量纲最大粒径增大而增大，并得到尺度参数和形状参数与粗颗粒无量纲最大粒径之间的对数经验关系。

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关键词 ：工程地质, 稀性泥石流, 粗颗粒, 冲击力, Log-Logistic函数, 随机关系

Abstract：

Debris-flow impact force exhibits strong randomness due to irregular shape and motion of coarse particles in the flow. In order to examine the influence of grain size on the impact force and its characteristics of random distribution，seven groups tests of debris-flow impact forces were carried out by large-scale flume in the Dongchuan station，Chinese Academy of Sciences. The material used in the tests originates from Jiangjia Ravine′s debris-flow deposition and the grain size is up to 8 cm. The experimental results indicate：the dimensionless impact force of debris-flow increases with the dimensionless maximum size of coarse particles，and there is a good exponential empirical relationship between them. The Log-Logistic probability density function is the best one to describe the distribution of the impact force among six probability density functions. The values of the Log-Logistic function′s scale and shape parameters increase with the dimensionless maximum size of coarse particles，showing the logarithmic empirical relationships between the parameters and size.

Key words： engineering geology diluted debris flow coarse particle impact force log-logistic function random relationship

引用本文:

黄远红1，2，3，胡凯衡1，2，唐金波1，2，李浦1，2，3. 稀性泥石流冲击力随机分布特征实验研究[J]. 岩石力学与工程学报, 2018, 37(S2): 3918-3926.
HUANG Yuanhong1，2，3，HU Kaiheng1，2，TANG Jingbo1，2，LI Pu1，2，3. Experimental study of random distribution characteristics of diluted debris-flow impact forces. , 2018, 37(S2): 3918-3926.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0828 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS2/3918

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