聚丙烯酰胺对三峡库区紫色土分离能力的影响
Influence of Polyacrylamide on Soil Detachment Capacity of Purple Soil in the Three Gorges Reservoir Area
高峰 1夏振尧 2张伦 1王地 1向瑞 1刘德玉 1肖海2
作者信息
- 1. 三峡库区地质灾害教育部重点实验室,湖北宜昌 443002;三峡大学土木与建筑学院,湖北宜昌 443002
- 2. 三峡库区地质灾害教育部重点实验室,湖北宜昌 443002;三峡大学土木与建筑学院,湖北宜昌 443002;三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌 443002
- 折叠
摘要
以三峡库区紫色土为研究对象,设置6个聚丙烯酰胺(PAM)施加量(0、0.4、0.8、1.2、1.6、2.0g/m2)和6个养护时长(1、3、7、15、30、60d),采用冲刷实验,研究PAM施加量及养护时长对土壤分离能力的影响,并从表观黏聚力和水稳性团聚体稳定性角度揭示土壤分离能力变化的原因.结果表明:同一 PAM施加量条件下,土壤分离能力随着养护时长的增加而降低,同一养护时长条件下,随着PAM施加量增加,土壤分离能力先减小后增加,PAM施加量为0.8 g/m2时,土壤分离能力最小;土壤分离能力与表观黏聚力、平均质量直径(MWD)和几何平均直径(GMD)之间均呈对数函数关系,表观黏聚力是描述土壤分离能力的最佳指标.
Abstract
The purple soil in the Three Gorges Reservoir area was used as the research object in this research,and the scouring experiment was conducted to obtain the soil detachment capacity of purple soil under 6 addition amounts of polyacrylamide(PAM)(0,0.4,0.8,1.2,1.6 and 2.0 g/m2)after being maintained for various durations(1,3,7,15,30 and 60 days).The influence of PAM addition amount and maintenance duration on soil detachment capacity were studied,and the reasons for the variation of soil detachment capacity were revealed from the perspective of apparent cohesion and water-stable aggregate stability.The results indicated that the soil detachment capacity decreased with the increasing of maintenance duration under the same addition amount of PAM,while the soil detachment capacity decreased with the increase of addition amount of PAM until reaching its minimum value at 0.8 g/m2,then followed by an increasing trend under the same maintenance duration.The relationship between soil detachment capacity and apparent cohesion,as well as water-stable aggregate properties(mean weight diameter and geometric mean diameter),could be well described by a nonlinear logarithmic function.Among these factors,apparent cohesion emerged as the optimal parameter for describing soil detachment capacity.
关键词
三峡库区/紫色土/聚丙烯酰胺/土壤分离能力/养护时长Key words
the Three Gorges Reservoir Area/purple soil/polyacrylamide(PAM)/soil detachment capacity/maintenance duration引用本文复制引用
基金项目
国家自然科学基金(U21A2031)
国家自然科学基金(42277323)
国家自然科学基金(U2040207)
土木工程防灾减灾湖北省引智创新示范基地(2021EJD026)
出版年
2024
NETL
NSTL
万方数据