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泥石流龙头冲击特性模型实验研究

DOI: 10.3969/j.>ssn.1674-0696.2014.01.19, PP. 85-89

Keywords: 泥石流龙头,冲击力,模型实验,浆体结度,固相比,debrisflowheads,impactforce,modeltest,slurryviscosity,solidphaseratio

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Abstract:

:?以平川泥石流沟为原型研制泥石流龙头运动与冲击特性实验模型,探索了5种浆体勃度、5种罔相比、4种间相颗粒粒径组合条件下泥石流龙头冲击特性,实施了85组冲击实验。实验结果表明:随着浆体秸度的增大,泥石流龙头作用越不明显,当秸度达到和超过0.72Pa.s时,龙头消失;泥石流龙头作用时间随着浆体教度与固相颗粒固相比的增加而减小,勃度为0,0.口,0.37Pa.s时,泥石流龙头冲击时间平均值分别为7.4,2.6,1.6S;低茹度与低固相比组合条件下,龙头冲击力峰值为冲击全程峰值,随着站度与固相比的增大,龙头冲击力峰值减小,不再是全程峰值。根据实验数据与图像资料将泥石流龙头形态分为高速高强度龙头形态、过渡塑龙头形态及低速低强度形态。

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