基于DLVO理论的粘土颗粒分离能力与液固比模型及验证  

Model of clay particle separation capability and liquid-solid ratio based on DLVO theory and verification

作　　者：程洪[1,2] 王赫[1,2] 黄国敏[1,2] 杨文利[1,2] 徐童心 赵建民[1,2] 蔡高堂[1,2] 甘建军[1,2] 江辉[1,2] CHENG Hong;WANG He;HUANG Guomin;YANG Wenli;XU Tongxin;ZHAO Jianmin;CAI Gaotang;GAN Jianjun;JIANG Hui(National and Provincial Joint Engineering Laboratory for the Hydraulic Engineering Safety and Efficient Utilization of Water Resources of Poyang Lake Basin,Nanchang 330099,China;School of Hydraulic and Ecological Engineering,Nanchang Institute of Technology,Nanchang 330099,China;School of Forestry,Nanjing Forestry University,Nanjing 210018,China)

机构地区：[1]南昌工程学院,鄱阳湖流域水工程安全与资源高效利用国家地方联合工程实验室,江西南昌330099 [2]南昌工程学院水利与生态学院,江西南昌330099 [3]南京林业大学林学院,江苏南京210018

出　　处：《南昌工程学院学报》2020年第3期38-43,共6页Journal of Nanchang Institute of Technology

基　　金：江西教育厅科学技术研究项目(GJJ180925);国家自然科学基金资助项目(51869012)。

摘　　要：根据DLVO理论建立有关土壤水膜和土壤液固比的土壤分离能力数学模型,得到土壤分离能力关于土壤液固比与颗粒粒径的计算公式,并对已有的薄层水流试验结果进行了相应的验证。研究表明,当土壤液固比上升时,土壤结合水膜厚度增加,二者呈线性相关;而土壤颗粒粒径越小,结合水膜的能力对液固比的响应越敏感,要达到相同水膜厚度,小粒径土壤颗粒所需液固更大;土壤分离能力(分离压)与液固比有关,通过薄层水流实验验证发现,土壤启动临界时的粘聚力c(分离压)和薄层水流临界剪切力τ0具有相等的状态,当τ0大于c时,土壤颗粒发生分离,土壤侵蚀开始启动。研究结果对土壤侵蚀的防治、土壤分离的防止、土壤结构的加固、土壤结构稳定及土壤生态服务功能的发挥都具有重要的理论和实践指导作用。In order to find out the relationship between soil separation capacity and soil liquid-solid ratio,a mathematical model of soil water membrane and soil liquid solid ratio was established based on the DLVO theory,and the results of the existing thin layer flow test were used to verify the model.The study shows that when the soil liquid solid ratio rises,the soil combined with the thickness of water film increases linearly,and the smaller the size of the soil particles,the more sensitive to the response of the water film to the response of the liquid to solid ratio,that is,the same water film thickness is reached,the small particle size of soil particles is more liquid and solid.It is found that the cohesive force(separation pressure)and the critical shear force tauτ0 of the thin layer flow are equal in the soil starting critical time,and the soil particles are separated and the soil erosion starts when theτ0 is greater than the cohesive force of the soil particles.The relationship between soil separation capacity and liquid solid ratio is preliminarily discussed,which provides theoretical guidance and practical guidance for prevention and control of soil erosion,prevention of soil separation,soil structure reinforcement,soil structure stability and the function of soil ecological service.

关 键 词：分离能力 液固比 DLVO理论 薄层水流 

分 类 号：Q142.3[生物学—生态学]