泥石流冲击荷载的概率密度分布试验研究  

Experimental study on probability density distribution of impact loading of debris flow

作　　者：何晓英[1] 唐红梅[1] 陈洪凯[1] 

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《人民长江》2016年第14期90-94,103,共6页Yangtze River

基　　金：国家自然科学基金(41071017);重庆市教委科学技术研究项目(KJ1500503)

摘　　要：建立浆体黏度和级配固相颗粒组合条件下的泥石流冲击室内模型,进行5种浆体黏度、5种固相比和4种颗粒粒径组合的85组试验。对试验数据进行概率统计,分析试验条件下泥石流体的冲击荷载概率密度分布特征。分析结果表明:冲击荷载概率密度曲线符合Gauss分布形式,拟合吻合度均达97%以上,中误差小于0.01;从形态上将实验中的概率密度曲线划分为单峰、奇异单峰、多峰及双驼峰分布形式,得到各种分布形式所对应的工况;仅考虑浆体黏度时,概率密度分布曲线随着浆体黏度的增大由单峰变为奇异单峰甚至多峰的分布形式;不考虑浆体黏度时,则是随固相颗粒粒径的增大同样由单峰变为奇异单峰及多峰的形式。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,5solid 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.

关 键 词：冲击荷载 概率密度 模型试验 浆体黏度 泥石流 

分 类 号：P642[天文地球—工程地质学]