泥石流浆体流变特性影响因素试验研究  

Experimental study on rheological properties factors of debris flow slurry

作　　者：胡正红[1] 张婧[1] 刘兴年[1] 杨克君[1] 郭志学[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《水力发电学报》2014年第2期131-136,共6页Journal of Hydroelectric Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB409903);国家自然科学基金项目(50949057)

摘　　要：采用安东帕第三代Physica MCR301流变仪对粒径在0.5mm以下的自配泥石流浆体进行测试,设置了不同黏粒含量的浆体在三种剪切模式下的试验,利用该仪器测定的结果分析研究了影响泥石流流变特性的因素。分析研究表明:在相同的剪切速率下,黏粒含量越多,浆体切应力越大。粗颗粒含量和黏粒含量的提升对切应力都有增加作用,在高浓度粗颗粒含量下,粗颗粒浓度对剪切应力的影响超过黏粒的贡献。剪切速率不变的情况下,剪切应力仍然持续增加,说明浆体结构存在随时间变化的震凝性。黏土性质对泥石流流变特性也会产生一定的影响。This experimental study made tests on debris flow slurry of particle size below 0.5ram with an Anton Paar Physica MCR301 rheometer. Factors of the rheological properties of debris flow were analyzed by using data series of slurry tests on different clay contents in three shear modes. Results show that under a fixed shear rate, an increase in coarse particles content or clay content will cause an increase in shear stress and that in the case of high concentration of coarse particles, the influence of the coarse particle content on shear stress exceeds that of the clay. The continuous increasing in shear stress under a fixed shear rate reveals a feature of slurry structure, that is, its anti-thixotropic changes over time. The clay＇s nature has some effects on the rheological properties of debris flow.

关 键 词：泥沙动力学 泥石流浆体 流变特性 流变仪 影响因素 

分 类 号：TV14[水利工程—水力学及河流动力学]