粘性泥石流体应力本构关系的试验研究  

Experimental research on stress constitutive relation of viscous debris flow

作　　者：王裕宜[1] 詹钱登[2] 韩文亮[3] 邹仁元[4] 

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中国科学院东川泥石流观测研究站,四川成都610041 [2]台湾成功大学水利与海洋工程学系,台湾台南70101 [3]清华大学水利系,北京100083 [4]中国科学院-水利部成都山地灾害与环境研究所,四川成都610041

出　　处：《自然灾害学报》2003年第2期64-70,共7页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目 ( 4 0 0 710 10 )

摘　　要：为了能直接测定含有粗颗粒砾石的粘性泥石流体原样的流变特性 ,专门研制了大型泥石流流变仪 ,利用该仪器测试的结果分析研究了粘性泥石流体的应力本构关系。分析研究表明 :粘性泥石流体在低速率区启动初始段 ,颗粒间的作用以接触挤压和滑动摩擦为主 ,其应力本构关系可用剪切稀化的幂定理方程来描述 ;在剪切速率区流动剪切段的应力本构关系 ,包含滑动摩擦作用的零次项和反映惯性碰撞的平方项 。Abstract: In order to research the stress constitutive relation of viscous debris flows, under support of the latest large scale rheometer specially designed and made by the author, the rheological characters of natural viscous debris flow with gravel were measured. Contact squeeze pressure and slip friction play a major role between grains in the initial stage(d u /d y <10s -1 )at low shear rate, the stress constitutive relation is described by power formula with stress dilution. The stress constitutive relation in the flow stage of high shear rate (10s -1 <d u /d y <20s -1 ) is consisted of a term of zero order of shear rate for slip friction and a quadratic term of shear rate for inertial collision stress.The debris have rheological characters of the yield stress and shear dilatation.

关 键 词：粘性泥石流 应力本构关系 流变特性 滑动摩擦 剪切速率 屈服应力 惯性碰撞 

分 类 号：P642.23[天文地球—工程地质学]