Abstract: At present,no theory at home and abroad can be used to interpret some phenomena reasonably and simultaneously.The phenomena include surging motion of debris flow,anti-grade deposits and fluctuation motion for coarse particle on debris flow.It is assumed that there is a high-pressure core by different velocities of solid and liquid in debris flow snout.When interior pressure in the core increases and reaches a critical value,the core blasts suddenly.This process is named as blasting mechanism of high-pressure core in debris flow.These phenomena mentioned above can be explained reasonably by particle buoyancy,collision forces and additional water pressure during formation and blasting of high-pressure core.Further,formation and evolution process of high-pressure core must be checked and observed by testing;meanwhile,the mechanics of blasting mechanism of high-pressure core in debris flow should be established.

Key words: debris flow, debris flow snout, blasting mechanism of high-pressure core in debris flow, surging, anti-grade deposits, fluctuation of particles

摘要： 目前国内外尚无一种理论可以同时合理地解释泥石流阵性流动、沉积相逆序结构及粗大颗粒在泥石流体表层上下浮动等现象。假定在泥石流龙头内部因固液分相流速差异孕发的压胀核,其内部压力逐渐增大至某一临界值时突然爆炸溃灭,此过程称为泥石流龙头压胀机理。压胀核形成与爆炸溃灭产生的颗粒浮力、碰撞力和超孔隙压力可以同时合理地解释泥石流阵流等现象。进一步研究中,应通过实验观测压胀核的形成演化过程,并建立压胀机理力学过程。

关键词: 泥石流, 龙头, 压胀机理, 阵性, 逆序结构, 颗粒浮动