泥石流冲击脉动荷载概率分布特征  

Probability distribution features of fluctuating impact force of debris flow

作　　者：陈洪凯[1,2] 唐红梅[1,2] 鲜学福[2] 张玉萍[1] 

机构地区：[1]重庆交通大学岩土与地质工程系,重庆400074 [2]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400040

出　　处：《振动与冲击》2010年第8期124-127,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金(50678182);重庆市重点自然科学基金(2008BA0015);中国博士后科学基金(20080430095);教育部高校博士点基金(20060618001)

摘　　要：针对0.3cm～0.8cm、0.8cm～15cm和1.5cm～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。成果对于推动泥石流动力特性科学研究具有积极意义。On the basis of experimental data of 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 solid to liquid ratio of 0.02,0.08,0.16,0.20 and 0.25,probability distribution features of fluctuating impact load of debris flow were unveiled in detail,after the data processing of wavelet denoising.Three aspects were displayed for the features:the first,under the identical particle diameter 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 with less solid to liquid ratio is similar to normal distribution,however,the probability density is similar to gaussian distribution for debris flow with greater solid to liquid ratio (e.g.over 0.08).Multi-peaks and extrema may emerge easily on proability density imopact force curve with bigger diameter of particles.The results 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 

分 类 号：P642.23[天文地球—工程地质学]