泥石流浆体与固体颗粒冲击信号能量分布研究  

Experimental study on the energy distribution characteristics of impacting signals of debris flow considering the slurry viscosity and particle collision

作　　者：何晓英[1] 陈洪凯[1] 唐红梅[1] 

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《振动与冲击》2016年第6期64-69,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(41071017);2013重庆高校创新团队建设计划资助项目(KJTD201305);重庆市教委科学技术研究项目(KJ1500503);重庆市科委重点自然基金项目(CSTC2013JJB30001)

摘　　要：用小波分析方法对5种浆体黏度、5种固相比与4种颗粒粒径组合的85组泥石流冲击室内模型实验所得冲击信号进行消噪、时频处理,通过对降噪的泥石流冲击信号进行冲击能量计算并分析实验中泥石流冲击能量与频谱间关系。结果表明,随浆体黏度、固相比及颗粒粒径增大,泥石流冲击信号能量呈增长趋势,且相同浆体黏度下固体颗粒粒径大于1.3-1.5 cm时,泥石流冲击能量增幅明显。将冲击信号分解为9个频段（0-1.958 Hz、1.958-3.906 Hz、3.906-7.812 Hz、7.812-15.625 Hz、15.625-31.25 Hz、31.25-62.5 Hz、62.5-125 Hz、125-250 Hz、250-500 Hz）,泥石流冲击信号96%以上能量聚集在频率0-1.958 Hz的低频段a8内。该结果对推动泥石流动力特性研究具有积极意义。A physical experimental model in laboratory was established for debris flow, and 85 groups＇ conditions were implemented considering the combination of five slurry viscosities, five solid phase ratios and four grain diameters. The impacting force signals of debris flow under the experimental conditions were denoised and disposed in time-frequency domain by wavelet method, then the impacting signals were broken down to nine frequency ranges （0 - 1. 958 Hz, 1. 958 -3.906 Hz, 3.906-7.812 Hz, 7.812-15.625 Hz, 15.625-31.25 Hz, 31.25 -62.5 Hz, 62.5 -125 Hz, 125-250 Hz, 250 - 500 Hz） and the energy distribution characteristics in each frequency range were calculated. The results show that, generally, the impacting energy of debris flow increases with the increase of slurry viscosity, solid phase ratio and grain diameter, and more than 96 percentages of the energy gets together in the 0 ~ 1. 958Hz （a8） low frequency range. The result is positive in the studies on dynamical features of debris flow.

关 键 词：泥石流冲击 能量分布规律 模型实验 浆体黏度 固相颗粒 

分 类 号：P642.23[天文地球—工程地质学] O359[天文地球—地质矿产勘探]