Experiment on the Water Management Characteristics of Silt Embankments Improved by Polyacrylamide(PAM)in Flooded Area of the Yellow River
In order to solve the issues of hard compaction,poor cohesiveness,easy penetration in water and loss of dike silt,in this paper,the polymer polyacrylamide(PAM)was used to improve the silt,the hydraulic characteristics of PAM-improved soil were studied,and the influence law of PAM on the soil-water characteristic curve was found.The results show that PAM has a great influence to the air intake value and residual moisture content of the soil,but has a small effect on the soil dehumidification rate.Under the same substrate suction,the volu-metric moisture content and residual moisture content of the improved soil are increased first and then decreased with the increase of PAM content,indicating that the water holding capacity is enhanced.Further analysis of the water stability of the improved soil shows that the dis-integration rate of both short and long time improved soil decreases with the increase of PAM content,indicating that PAM has a good effect on the disintegration resistance of silt soil.When the dosage is 1%-1.2%,the modified soil sample does not experience significant disintegra-tion and exhibits relatively strong water stability.The research results are of great significance for the prevention of silt diseases,the safety of levees,the structural safety,protection and utilization of nearby upper historic buildings.
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