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启动的应力本构方程和触变特性的关系。粘性泥石流体在低速率区启动初始阶段,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。粘性泥石流体在剪切"上行"与"下行"曲线环绕的延迟区域的存在,说明该流体具有触变能量,并通过触变能量的计算以及与泥石流运动要素的对比,探讨了粘性泥石流体触变应力本构关系。
Under support of the latest rheometer specially designed and made by the author,the rheological characters of natural viscous debris flow with thick gravel were measured. Squeeze pressure and sliding friction play a major role in action between grains in the initial section(du/dy<10 s^(-1))at low shear rate,and at that time the constitutive stress relation can be described by power formula with stress dilution. Occurrence of viscous debris flow in delaying area surrounding by up and down shear curves indicates that the fluid has thixotropy energy and the thixotropy constitutive relation of viscous debris flows should be researched,passing calculation of thixotropy energy and comparison between thixotropy energy and movement factors.
出处
《自然灾害学报》
CSCD
北大核心
2004年第3期33-38,共6页
Journal of Natural Disasters
基金
国家自然科学基金资助项目(40071010)
关键词
粘性泥石流
幂定理方程
触变能量
触变应力本构关系
viscous debris flow
power formula
thixotropy energy
thixotropy constitutive relation
