平川沟泥石流体形成的动力机制研究

泥石流沟内松散物质(岩土体)在降雨作用下，由吸水→强度衰减→蠕变而构成初始泥石流体，形成机制包括降雨冲击机制和吸水软化机制。初始泥石流体运动诱发沟岸冲蚀、沟底掏蚀而补给构成泥石流体，补给机制包括岸坡切割机制和沟床物质启动机制。构建了由粒径为6．31cm的均质颗粒固相和均质浆体的等效泥石流体，为泥石流运动及冲击机理研究奠定理论基础。

Research on Dynamic Mechanism Formed by Debris Flow of Pingchuan Channel

Loose soils in a sloping debris flow channel become initial debris flow mass(IDFM) through strength attenuation and creep after absorbing water from precipitation. The dynamic mechanism formed by IDFM includes both impact of precipitation and soften soils on slope. In the course of erosion and scour induced by IDFM to the bank slope of debris flow valley, much loose rocks and/or soils throw ino IDFM so as to construct real debris flow mass(RDFM). Dynamic mechanism to consummate RDFM includes cutting of bank and starting of bed materials in valley. According to above the authors set up equivalent debris flow mass model that is composed of homogeneous particles with diameter 6.31 cm and homogeneous grout in the paper, which is an important theoretical base to approach the movement and impact of debris flow.