关键词: 冲击荷载, 概率密度, 模型试验, 浆体黏度, 泥石流

Abstract:

A physical lab-experimental model of debris flow under compounding of slurry viscosities and solid phase grain gradation was established, and 85 groups working conditions were done by considering the compounding of 5 slurry viscosities, 5 solid phase ratios and 4 grain diameters. The distributing characteristics of the probability density of the impacting force of debris flow under the experimental conditions were analyzed by probability statistics. The results show that the probability density curve of impacting force obeys Gauss distribution and the R-square can reach to 97%, the RMSE is less than 1%; Secondly, the modality of the probability density curve can be divided into unimodal distribution form, strange unimodal distribution form, multimodal distribution form and hump-shaped pad block form, and the experimental conditions that corresponded to these distribution forms are made clear; Thirdly, the probability density curves under working conditions that only considering the slurry viscosity, the probability density would change from unimodal distribution to strange unimodal and multimodal contribution form with the increase of the slurry viscosities; in the working conditions without considering the slurry viscosity, the same pattern also exists with the increase of grain diameters.
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Key words: impact force, probability density, model test, slurry viscosity, debris flow