絮凝调理对淤泥(浆)固结特性的影响  

Effect of flocculation conditioning on consolidation characteristics of mud(slurry)

作　　者：章荣军[1] 蒋达飞 郑俊杰[1] ZHANG Rongjun;JIANG Dafei;ZHENG Junjie(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学土木与水利工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2021年第7期1-6,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2016YFC0800200);国家自然科学基金资助项目(51678266,51978303)。

摘　　要：通过开展室内絮凝-堆载预压试验,模拟不同配比的絮凝剂-淤泥混合浆液的排水固结过程.选取堆载预压后孔隙比接近的淤泥试样开展室内一维固结压缩试验,探究絮凝剂对淤泥(浆)固结特性的影响.结果显示:添加絮凝剂能够增大预压后淤泥的结构屈服应力,但会导致预压后淤泥表现出更高的压缩性.另外,不同种类的絮凝剂对预压后淤泥次固结系数(Cα)的影响有所不同,与未经絮凝调理的淤泥相比,有机絮凝剂PAM调理淤泥的次固结系数显著增加,而无机絮凝剂PFC或CaO调理淤泥的次固结系数基本保持不变甚至略有降低.An laboratory flocculation-surcharge preloading test was carried out to simulate the drainage consolidation process of the mixed flocculant-mud of different proportions.Samples with similar void ratios after preloading was selected to carry out the indoor one-dimensional consolidation compression test to explore the effect of flocculants on the consolidation characteristics of mud(slurry).Results show that the addition of flocculants can increase the structural yield stress of the pre-compressed mud,but it will cause the pre-compressed mud showing higher compressibility.In addition,different types of flocculants have different effects on the secondary consolidation coefficient(Cα) of mud after preloading treatment. Compared with the mud without flocculation conditioning,the Cαof mud conditioned by the organic flocculant PAM increases significantly,while the Cαof mud conditioned by inorganic flocculant PFC or CaO remains basically unchanged or even slightly decreases.

关 键 词：疏浚淤泥 絮凝调理 预压 固结 次固结系数 

分 类 号：TU411.5[建筑科学—岩土工程]