泥石流两相冲击力及冲击时间计算方法

将泥石流体概化为两相流体,即具有相同粒径的固相颗粒和具有相同力学性质的液相浆体。基于泥石流体为沿流动方向的一维流假定,通过计算固、液分相流速和分相运动加速度,运用牛顿第二定律建立了液相浆体和固相颗粒的冲击力计算式,并据此构建了计算泥石流两相冲击力的综合表示式;运用泥石流在防治结构表面产生的冲击坑或在泥石流沟岸产生的冲蚀槽等冲击形迹,建立了泥石流冲击时间计算方法。通过工程实例分析显示,计算结果与实测结果吻合较好,相对误差在3%以内,满足实际工程要求。

Method to Calculate Impact Force and Impact Time of Two-Phase Debris Flow

Debris flow was simplified as two-phase liquid composed of particles with the same diameter and slurry with the same mechanical features.Assuming that debris flow was one dimension liquid moving to one direction.Authors established methods to calculate impact forces of liquid phase and solid phase by the second Newton's law through calculating velocities and acceleration of every phase,then,obtained general equation to calculate impact force of debris flow.Further,method to calculate total impact time of debris flow through impact formalities,such as impact pits in surface of control structures and impact troughs in bank of debris flow valley was obtained.According to engineering cases to control debris flow,it is obvious that the results between calculating in the methods and observations in real-time field are fitted better,whose relative errors are in 3%,which are permitted in engineering design.