粘性泥石流体的应力应变特征和应力本构关系的研究  

An Approach to Rheological Characters of Viscous Debris Flow and the Stress Constitute

作　　者：王裕宜[1,2] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所 [2]中国科学院东川泥石流观测研究站,四川成都610041

出　　处：《山地学报》2006年第5期555-561,共7页Mountain Research

基　　金：国家基金(4007110);中科院山地所创新基金Y106005

摘　　要：通过粘性泥石流体阵性流的野外观测和最新研制的泥石流流变仪应用,含有砾石的粘性泥石流体具有明显的应力过冲、触变能量、剪切稀化和双屈服应力等流变特征被得到研究。粘性泥石流应力应变的自组织临界特性分析表明,泥石流的规模与频率间存在着幂定律关系。粘性泥石流体在低速率区启动初始段,其应力本构关系可用剪切稀化的幂定理方程来描述。粘性泥石流体在剪切速率区流动剪切段的应力本构关系,应包含滑动摩擦作用的零次项和反映惯性碰撞的平方项,具有屈服应力和剪切膨胀的流变特征。By using the latest rheometer specially designed and observation of surges in viscous debris flows, the rbeological characters of viscous debris flow with gravel have such as over stress, thixotropy energy, stress dilution and yield stress were been researched. Analysis of stress ＆ strain self-organization criticality of debris flow mass show that power relation between magnitude and frequency of debris flows. The stress constitute relation is described by power formula with stress dilution in the initial seetion（du/dy 〈 10/s）at low shear rate. The stress constitute relation in flow section （10/s 〈 du/dy 〈 20/s）of shear rate is consisted by term of zero order at shear rate for smooth friction and quadratic term at shear rate for inertia collision stress, they have rheological characters of the yield stress and shear dispersion.

关 键 词：粘性泥石流 应力应变 规模与频率关系 应力本构关系 

分 类 号：P642.23[天文地球—工程地质学]