吹填泥浆的混凝沉降特性试验  

Laboratory study on coagulation-sedimentation behaviors of hydraulic-dredged mud

作　　者：陈宏[1,2] 刘胜宇 陈绍文 黄良材 余关龙[1,2] 陈晨[1,2] 

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410004 [2]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410004 [3]广东金东海集团公司,广东汕头515041

出　　处：《水利水电科技进展》2013年第5期69-72,共4页Advances in Science and Technology of Water Resources

基　　金：湖南省自然科学基金(11JJ4044);水沙科学与水灾害防治湖南省重点实验室开放基金(2011SS08);湖南省重点学科建设项目(2011SB03)

摘　　要：为解决水力吹填泥浆自由沉降所需时间较长,退水排放会带走大量淤泥,以及吹填土地基自然固结时间长等问题,向泥水混合液分别投加聚合氯化铝(PAC)和聚丙烯酰胺(PAM),搅拌静置沉淀后测定混合液剩余浊度、剩余固体悬浮物质量浓度(SS)及泥水界面高度,考察其混凝沉降性能。试验结果表明,投加混凝剂能在一定程度上加速吹填泥浆的沉降分离,提高出水水质。随着PAC和PAM投加量的增加,混合液剩余浊度和剩余SS值均呈现先降低后升高的趋势,而泥水界面高度基本保持不变。当PAC投加量为360mg/L时,混合液剩余浊度和剩余SS达到最小值,分别为287.4和1.45 g/L;当PAM投加量为2.8 mg/L时,混合液剩余浊度和剩余SS最小,分别为752.7和2.83 g/L。In order to solve the problems that a long period is needed in the free settlement of the hydraulic-dredged mud,a large quantity of silt particles is brought away during the discharge of the recession flow,and a long period is also needed for the natural consolidation of the dredged mud foundation,PAC or PAM was added into the mud mixture individually in the study.After the agitation and precipitation,the residual turbidity,the residual SS of the supernatant and the height of the interface between supernatant and sediments were measured to investigate the coagulation sedimentation property.The experimental results show that both residual turbidity and SS value decrease first and then increase,and the interface remains unchanged with an increased dosage of PAC or PAM.When a PAC dosage of 360 mg / L was added,the minimum residual turbidity and SS value were obtained with the values of 287.4 and 1.45 g / L,respectively.When a PAM dosage of 2.8 mg / L was added,the minimum residual turbidity and SS value were obtained with the values of 752.7 and 2.83 g / L,respectively.The addition of coagulants could in some extent promote the settling and separation of the hydraulic-dredged mud,and enhance the water quality of the recession flow.

关 键 词：吹填泥浆 混凝沉降特性 聚合氯化铝 聚丙烯酰胺 

分 类 号：TU991.2[建筑科学—市政工程]