Comparison of Rheometric Devices for Measuring the Rheological Parameters of Debris Flow Slurry  

作　　者：YANG Hong-juan WEI Fang-qiang HU Kai-heng ZHOU Gong-dan LYU Juan 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences [2]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences

出　　处：《Journal of Mountain Science》2015年第5期1125-1134,共10页山地科学学报（英文）

基　　金：financially supported by the Key Research Program of the Chinese Academy of Sciences (CAS) (Grant No. KZZD-EW-05-01);the Youth Talent Team Program of Institute of Mountain Hazards and Environment, CAS (Grant No. SDSQB-2013-01);the National Natural Science Foundation of China (Grant No. 41201011)

摘　　要：Soil samples with clay content ranging from 15% to 31%, were taken from three debris flow gullies in Southwest China. Three debris flow slurry samples were prepared and tested with four measuring systems of an Anton Paar Physica MCR301 rheometer, including the concentric cylinder system,the parallel-plate system, the vane geometry, and the ball measuring system. All systems were smoothwalled. Flow curves were plotted and yield stress was determined using the Herschel-Bulkley model,showing differences among the different systems.Flow curves from the concentric cylinder and parallelplate systems involved two distinct regions, the low shear and the high shear regions. Yield stresses determined by data fitting in the low shear region were significantly lower than the values from the inclined channel test which is a practical method for determining yield stress. Flow curves in the high shear region are close to those from the vane geometry and the ball measuring system. The fitted values of yield stress are comparable to the values from the inclined channel test. The differences are caused by wall-slip effects in the low shear region.Vane geometry can capture the stress overshoot phenomenon caused by the destruction of slurry structure, whereas end effects should be considered in the determination of yield stress. The ball measuring system can give reasonable results, and it is applicable for rheological testing of debris flow slurries.

关 键 词：Debris flow SLURRY RHEOMETER Concentric cylinder system Parallel plate system VANE Ball measuring system 

分 类 号：P642.23[天文地球—工程地质学]