泥石流浆体冲击特性实验研究  

Tests for impacting characteristics of debris flow slurry

作　　者：何晓英[1] 唐红梅[1] 朱绣竹 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：《振动与冲击》2013年第24期127-134,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(41071017)

摘　　要：进行液相浆体粘度0 Pa·s、0.13 Pa·s、0.37 Pa·s、0.72 Pa·s、0.93 Pa·s的泥石流浆体冲击特性模型实验,采用小波方法揭示泥石流浆体冲击特性,结果体现在三方面:随着泥石流浆体粘度的增大,泥石流冲击力与冲击力标准差呈非线性增大,冲击力概率密度由近似正态分布逐渐偏离;泥石流95%以上的冲击能量分布在小于1.958 Hz的低频部分;泥石流冲击能量百分比总体从低频至高频呈迅速衰减分布趋势,且泥石流粘度越高,低频段至高频段的冲击能量衰减速度越快。该成果对于推动泥石流动力特性科学研究具有积极意义。A physical test model in laboratory for debris flow with 5 slurry viscosities of 0Pa· s, 0.13 Pa· s 0.37 Pa· s, 0.72 Pa ·s and 0.93 Pa· s was established. The impacting characteristics of debris flow slurry were revealed in detail with the wavelet method. It was shown that with increase in debris flow＇s slurry viscosity, the impacting load and its standard deviation exhibit a nonlinear increase, and its probability density gradually deviates from Gaussian distribution; 95 percent of impacting energy of debris flow centralizes in a lower frequency band less than 1. 958Hz, and the percentage of impacting energy rapidly decreases from low frequency to high frequency; furthermore, the bigger the slurry viscosity, the faster the decreasing speed. The results were very meaningful to study on dynamical features of debris flow.

关 键 词：粘性泥石流 冲击特性 模型实验 浆体粘度 

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]