关键词: 疏浚淤泥, 颗粒分选, 分选系数, 自重沉积, 白马湖,

Abstract: Particle sorting will occur when dredged silt is filled into a yard,and quantitative evaluation for particle sorting characteristics of dredged silt is helpful to revealing the particle sorting law and predicting the particle distribution.Through the self-gravity deposition test of Baima Lake silt,the particle size analysis of stratified sampling of sediment was carried out,and the particle sorting law in the process of self-gravity deposition of dredged silt under each moisture content was analyzed.The measurement method of particle sorting degree in self-gravity deposition process was discussed.By using the particle size parameters in sedimentology,the average particle size and uniformity of soil samples at different depths after self-gravity deposition of dredged silt were analyzed.In view of the problems existing in the process of studying the law of self-gravity deposition of dredged mud,a new quantitative evaluation parameter,the sorting coefficient was proposed.According to the relationship between the separation coefficient and the initial moisture content of silt,the initial moisture content of the dredged silt was divided into three stages:the water confinement section,the water sensitive section and the separation maximization section.

Key words: dredged silt, particle sorting, sorting coefficient, self-gravity deposition, Baima Lake