泥石流流体性质与弯道幅度角对超高影响的实验研究

发布时间：2019-03-03 14:26

【摘要】：泥石流的弯道超高特性随泥石流的流体性质不同而有显著差异。开展了稀性、亚黏性和黏性3类泥石流的25组弯道超高水槽实验,研究发现:1)泥石流过弯的液面倾角与流速的关系分为3个不同区间。当流速小于2.4 m/s时、大于3.0m/s时,泥石流液面倾角分别在24°、50°左右波动;处于两者之间时,液面倾角随流速线性增长。2)不同类型泥石流超高最大值出现的位置有显著差异,稀性、亚黏性和黏性泥石流弯道超高最大值分别出现在75°、60°和45°幅度角左右。3)采用线性回归分析方法分析了弯道超高分布系数随幅度角正弦值的变化曲线,得到两者之间呈三次多项式的经验关系。
[Abstract]:The characteristics of bend superelevation of debris flow vary significantly with the fluid properties of debris flow. The experiments of 25 groups of curved super-high flume of debris flow with rarefaction, sub-viscosity and viscosity are carried out. It is found that: 1) the relationship between the inclination of the liquid level and the velocity of the overbend of debris flow is divided into three different intervals. When the velocity is less than 2.4m / s and the velocity is greater than 3.0m/s, the dip angle of debris flow liquid surface fluctuates about 24 掳and 50 掳respectively. 2) the maximum values of superelevation of different types of debris flow are significantly different, such as rarefaction, sub-viscosity and viscous debris flow, and the maximum values of superelevation appear in 75 掳, respectively, with the velocity of flow increasing linearly. 2) the maximum values of superelevation of different types of debris flow appear at 75 掳, respectively. About 60 掳and 45 掳amplitude angle. 3) the curve of distribution coefficient of curve superelevation with the sine value of amplitude angle is analyzed by linear regression analysis method, and the empirical relationship between them is obtained as cubic polynomial.
【作者单位】：中国科学院山地灾害与地表过程重点实验室;中国科学院水利部成都山地灾害与环境研究所;中国科学院大学;国网四川省电力公司技能培训中心;四川电力职业技术学院;
【基金】：国家自然科学基金(41371039) 国家重点基础研究发展计划(2015CB452704) 中国科学院山地灾害与地表过程重点实验室开放基金(Y3K2040040)~~
【分类号】：P642.23

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