[1]周 琳,胡斐南*,许晨阳,等.典型砒砂岩土壤浆体流变特性[J].山地学报,2023,(2):204-215.[doi:10.16089/j.cnki.1008-2786.000742]
　ZHOU Lin,HU Feinan*,XU Chenyang,et al.Rheological Properties of Typical Pisha Sandstone Soil Slurry[J].Mountain Research,2023,(2):204-215.[doi:10.16089/j.cnki.1008-2786.000742]
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典型砒砂岩土壤浆体流变特性
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2023年第2期
页码:
204-215
栏目:
山地灾害
出版日期:
2023-03-25

文章信息/Info

Title:
Rheological Properties of Typical Pisha Sandstone Soil Slurry
文章编号:
1008-2786-(2023)2-204-12
作者:
周 琳1; 2; 胡斐南1; 3*; 许晨阳3; 王金晓3; 雷雪儿3
(1.中国科学院水利部水土保持研究所 黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西 杨凌 712100; 2.中国科学院大学,北京 100049; 3.西北农林科技大学 资源环境学院,陕西 杨凌 712100)
Author(s):
ZHOU Lin1; 3; HU Feinan1; 2*; XU Chenyang2; WANG Jinxiao2; LEI Xueer2
(1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China; 2. College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China)
关键词:
泥浆;  流变特性;  旋转剪切;  应力应变;  砒砂岩
Keywords:
slurry;  rheological properties;  rotational shear;  stress-strain;  Pisha sandstone
分类号:
S152.9
DOI:
10.16089/j.cnki.1008-2786.000742
文献标志码:
A
摘要:
黄土高原砒砂岩区基岩裸露,碎屑物源充足,一旦遇水成泥,极易形成坡面泥流。过去的研究主要关注坡面泥流(挟沙水流)的前期失稳触发机制和最终泥沙搬运量,忽略了对泥流运动过程及演化规律的研究。本研究以四种典型砒砂岩土壤为研究对象,将其制备成不同固体体积浓度的泥浆体,采用流变仪对各试样进行旋转剪切,分析典型砒砂岩土壤浆体流变特性变化规律及剪切速率和固体浓度对其流变参数的影响。结果表明:(1)当砒砂岩土壤浆体中固体浓度较高时,随着剪切速率增加,砒砂岩土壤浆体剪切应力增加、黏度减小,表现出剪切变稀的特点; 当固体浓度减小,偏土类(紫色、棕色)砒砂岩土壤浆体先出现剪切变稀向剪切增稠的转变;(2)随着固体体积浓度增加,四种砒砂岩土壤浆体的剪切应力和黏度均增加,偏土类(紫色、棕色)砒砂岩土壤浆体的流变参数变化存在明显的体积浓度拐点(Cv=0.41);(3)在高浓度样品中,偏土类(紫色、棕色)砒砂岩土壤浆体的剪切应力和黏度受固体体积浓度影响较大; 在低浓度样品中,偏砂类(红色、白色)砒砂岩土壤浆体的剪切应力和黏度受固体体积浓度影响较大。本研究可为进一步理解砒砂岩遇水后的流动规律和评估砒砂岩区泥流活动提供一定的理论参考。
Abstract:
The exposed bedrocks in Pisha sandstone area provide great amounts of debris, on which mud can be easily formed while encountering with water, thus generating slope mudflows. Mudflow is a severe type of soil erosion. The researches on mudflow focused on its triggering mechanisms and sand transport amounts, but less attention was paid to the flow process and evolving patterns of the mudflow. There was still a lack of research reports on stress-strain law and rheological characteristics of slope mudflow.
In this study, rheometer was adopted to investigate the rheological properties of slurries from four typical Pisha sandstone soils(PSS), namely purple PSS, brown PSS, red PSS and white PSS, with different solid volume concentrations(Cv). The rotating shear mode was used to analyze the effects of shear rate and Cv on their rheological parameters. Results showed that:(1)When Cv of the PSS slurries was high, as the shear rate increased, the shear stress of the soil slurries increased, and the viscosity decreased, showing the characteristics of shearing thinning. When the Cv was reduced, earth-like PSS(purple and brown PSS)slurries showed the transformation from shear thinning to shear thickening earlier than sand-like PSS(red and white PSS)slurries.(2)With the increase of Cv, the shear stress and viscosity of all PSS slurries increased; and there was an clear inflection point(Cv=0.41)in the variations of rheological parameters for earth-like PSS.(3)At high Cv, the shear stress and viscosity of earth-like PSS were greatly affected by Cv; while at low Cv, the shear stress and viscosity of sand-like PSS slurries were greatly affected by Cv. The findings provide theoretical references for further understanding the flow patterns of PSS slurries and evaluating the slurry ricks in Pisha sandstone area.

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备注/Memo

备注/Memo:
收稿日期(Received date): 2022-11-01; 改回日期(Accepted date):2023-03-21
基金项目(Foundation item): 国家自然科学基金(41977024)。[National Natural Science Foundation of China(41977024)]
作者简介(Biography): 周琳,(1997-),女,河南南阳人,硕士研究生,主要研究方向:土壤侵蚀机理研究。[ZHOU Lin(1997-), female, born in Nanyang, Henan province, M.Sc. candidate, research on soil erosion mechanism] E-mail: zhoulin20@mails.ucas.ac.cn
*通讯作者(Corresponding author): 胡斐南,(1986-),男,博士,研究员。主要研究方向:土壤学与水土保持研究。[HU Feinan(1986-), male, Ph.D., professor, research on soil science and soil and water conservation] E-mail: hufn@nwafu.edu.cn
更新日期/Last Update: 2023-03-30