基于动量守恒的粘性泥石流冲击力计算

Impact force calculation of viscous debris flow based momentum conservation

目前针对泥石流冲击压力的计算公式均假定泥石流体为连续流体。粘性泥石流的主要流动形式为阵流,其流速和密度的变化规律,目前尚未清楚,采用现有公式误差较大。本文基于动量守恒原理,引入泥石流体微元概念,推导出泥石流冲击力计算公式;采用Hilbert变换这种数字滤波方法对实测的冲击作用信息进行信号处理后,计算出公式所需参量。

At present, several formulas of impact load about debris flow in common use are based on the hypothesis that debris flow is continuous flow. Because the viscous debris flow behaves mainly discontinuous and the variability about velocity and density of debris flow is uncertain, there is a quite big discrepany by using present formulas to calculate impact load of the viscous debris flow. In this paper, a concept of debris flow micro-cell was introduced and a new formula of impact load about viscous debris flow was deducted based on momentum conservation. Besides the authors deal with the measured impact load information by Hilbert transform to obtain necessary parameters for the calculation of the proposed formula.