摘要
针对0.3~0.8cm、0.8~15cm和1.5~3.0cm三种固相粒径组和0.02、0.08、0.16、0.20、0.25五种固相比组合的15种水石流体的室内模型试验数据，采用小波方法消噪处理，揭示泥石流冲击脉动荷载概率分布特性，体现在三个方面：固相粒径相同时，泥石流冲击荷载随固相比的增加而增大，粒径较大的泥石流体冲击荷载越大；泥石流冲击荷载累计曲线呈现反S型非线性分布，且粒径越小，反S形态越清晰；固相浓度较低的泥石流冲击概率密度分布接近于正态分布，而固相浓度较大（超过0.08）时近似服从高斯分布，并且泥石流体粒径越大，冲击概率密度分布曲线易于出现多峰和极值。本文成果对于推动泥石流动力特性科学研究具有积极意义。
Abstract
On the basis of experimental dataof fifteen types of artificial debris flows, composed of three sets of particle solids with 0.3~0.8cm, 0.8~15cm and 1.5~3.0cm in diameter and fluid with 0.02, 0.08, 0.16, 0.20 and 0.25, probability distribution features of fluctuating impact load of debris flow are unveiled in detail, after the data processing denoising. Three aspects were displayed for the features: the first, under the identical particle dianeter in debris flow, impact forces raise with the increase of solid to liquid ratio, especially, the impact forces become greater with bigger diameter of particles. The second, cumulative curves of debris flow impact forces display in anti-S shape, and the anti-S shape becomes obvious with less diameter of particles. The third, probability density of impact forces for debris flow in less ratio of solid to liquid is similar to normal distribution, however, the probability density is similar to gaussian distribution for debris flow with greater ratio of solid to liquid (e.g. over 0.08), and multi-peak and extremum emerge easily on proability density imopact force curve in debris flow with bigger diameter of particle. The results in the paper are positive in the studies on dynamical features of debris flow.
关键词
泥石流冲击脉动荷载 /
概率分布特征 /
模型试验 /
固相比 /
颗粒粒径
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Key words
fluctuating impact force of debris flow /
probability distribution features /
simulation in labotatory /
ratio of solid to liquid /
diameter of particle
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陈洪凯;唐红梅;鲜学福;张玉萍.
泥石流冲击脉动荷载概率分布特征[J]. 振动与冲击, 2010, 29(8): 124-127
CHEN Hong-kai;;TANG Hong-mei;;XIAN Xue-fu;ZHANG Yu-ping.
Probability Distribution Features of Fluctuating Impact Force of Debris Flow
[J]. Journal of Vibration and Shock, 2010, 29(8): 124-127
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