堆场疏浚淤泥含水率分布规律调查研究

Study of diversification of water contents in dredged sediment storage yard

堆场淤泥的沉积、固结过程直接影响到后续淤泥的处理方法和经济成本。通过在南水北调东线白马湖现场使用绞吸式挖泥船疏挖白马湖底泥,吹淤进入堆场,研究了堆场内淤泥含水率随时间、沿程和堆场深度上的变化规律。结果表明,堆场内疏浚淤泥含水率随时间逐渐降低,随沿程逐渐升高,130d后吹淤口处含水率降低到20%～50%之间;160d后,距离吹淤口100m距离吹淤口200m处和处含水率维持在100%～150%和100%～170%之间;随深度逐渐降低,到40cm深时,含水率降低减缓,维持在140%左右;疏浚泥中黏粒含量随着距离吹淤口距离的增大而增多,随着深度的加深而减小,疏浚泥的渗透系数随着距离吹淤口距离的增大而减小,随深度的加深而增大。

Dredged sediment sedimentation and consolidation progress in the storage yard directly affects the subsequent disposal method and cost.This research relying on the east line of South-to-North Water Transfer Project,the fine sediments were dredged from Baima Lake to the nearer storage basin with a cutter suction dredger.The rules of water contents changing with the deposit time,space and the depth of the storage yard ware studied.Results showed that the water content of the dredged sediment was reduced gradually with time and increased with the distance.The water content in the entrance was 20%-50%after 130 days;after 160 days,100%-150%at 100 m away from the entrance,and 100%-170%at 200 m away from the entrance.The water content of the dredged sediment was reduced gradually by the depth of the storage yard,the water content was achieve to 140%when the depth of the dredged sediment was 40 cm.The clay content of dredged sediment was increased with the distance of the entrance and reduced by the depth of the storage yard.The permeahility coefficient of the dredged sediment was reduced with the distance of the entrance and increased with the depth of the storage yard.