自重及加载条件下絮凝剂调理废弃泥浆的脱水效果  

Dewatering Effect of Flocculant Conditioning Waste Mud underSelf-Weight/Loading Conditions

作　　者：韩超 俞越中 柏彬 肖涵[2] 范舟 吴巍 孙科 HAN Chao;YU Yue-zhong;BAI Bin;XIAO Han;FAN Zhou;WU Wei;SUN Ke(Construction Branch,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,China;School of Civiland Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]国网江苏省电力有限公司建设分公司,南京210000 [2]华中科技大学土木与水利工程学院,武汉430074

出　　处：《长江科学院院报》2024年第2期115-122,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国网江苏省电力有限公司科技项目(J2020070)。

摘　　要：群桩基础、地下连续墙等施工会带来巨量的废弃泥浆,城市地下空间开发利用及盾构掘进过程会产生大量高含水率泥浆状的渣土,常规的堆场处理受限于成本和环境问题,需要对废弃泥浆进行高效脱水处理,减少废弃泥浆量。为研究絮凝剂调理废弃泥浆的脱水效果,提升泥浆脱水效率,采用单一、复合絮凝剂调理废弃泥浆,通过室内量筒沉积和小型堆载预压试验,对比研究絮凝剂类型和掺量配比对泥浆泥水分离效果的影响,并为脱水效果提供判断依据。结果表明:有机絮凝剂能够改善泥浆的脱水性能,提高泥水分离程度,且存在最优掺量;复合絮凝剂能够发挥有机、无机絮凝剂的协同作用,更进一步提升泥浆脱水程度,其中PAM类复合絮凝剂脱水性能优异,PAM与CaO复合絮凝剂组合处理泥浆时,其沉积层含水率降低程度能够达到82.75%。研究成果可为废弃泥浆的合理处置和资源化利用提供参考。The construction of pile group foundations and underground diaphragm walls generates a significant amount of waste mud.Similarly,the development and utilization of urban underground space,as well as the process of shield tunneling,result in the production of high-moisture mud-like slag.Conventional yard treatment is limited due to cost and environmental concerns.Thus,an efficient dewatering method is needed to reduce waste mud volume.To evaluate the dewatering effect of flocculant conditioning on waste mud and enhance dewatering efficiency,we employed single and composite flocculants to examine the influences of type and dosage of flocculants on mud-water separation and sought to establish a basis for assessing dewatering effectiveness.Our findings demonstrate that organic flocculants enhance dewatering performance and promote mud-water separation,with an optimal dosage.Moreover,composite flocculants exhibit a synergistic effect from both organic and inorganic components,further enhancing dewatering capacity.Specifically,PAM composite flocculant has excellent dewatering performance.The combination of PAM and CaO composite flocculants could reduce the water content in sedimentary layer by 82.75%.

关 键 词：泥浆 有机絮凝剂 复合絮凝剂 泥水分离 脱水效果 堆载预压 评价指标 

分 类 号：TU447[建筑科学—岩土工程]