电渗法联合化学固化法改良淤泥试验  

Experiment on improving sludge by electroosmosis combined with chemical solidification

作　　者：李丽华 杨俊杰 徐维生 宋杨 曹毓 LI Lihua;YANG Junjie;XU Weisheng;SONG Yang;CAO Yu(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;Hubei Ecological Road Research and Engineering Center,Wuhan 430068,China;Hebei Key Laboratory of Geotechnical Engineering Safety and Deformation Control(Hebei University of Water Resources and Electric Engineering),Cangzhou,Hebei 061000,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]湖北省生态道路工程技术研究中心,武汉430068 [3]河北省岩土工程安全与变形控制重点实验室(河北水利电力学院),河北沧州061000

出　　处：《中国科技论文》2022年第12期1340-1345,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(52278347,51978237);湖北省重点研发计划项目(2022BCA059);武汉市科技计划项目(2020020601012278);湖北工业大学绿色工业科技引领计划项目(XJ2021000501)。

摘　　要：为使淤泥快速排水减量并提高其强度,进行单一电渗、电渗-固化联合试验,研究通电电压、电极距、固化剂掺量和养护龄期等因素对淤泥加固效果的影响。通过扫描电子显微镜(scanning electron microscope,SEM)试验观察典型微观结构,进一步探究淤泥加固机理。结果表明:较高的通电电压下,含水率下降幅度较大;采用阳极跟进法后,土体处理效果更加均匀,平均含水率降至56%;电渗-固化联合处理后,淤泥强度提升明显;固化土强度并非与固化剂掺量呈正相关关系,最优掺量下,养护龄期有助于水化产物和土颗粒之间更好地胶凝,形成土体骨架,提高土体强度。In order to reduce the amount of sludge drainage and improve its strength,the single electroosmosis,electroosmosis and solidification experiments were carried out.The influence of voltage,electrode distance,dosage of curing agent and curing age on the effect of sludge reinforcement was studied.Scanning electron microscope(SEM)test was carried out to observe the typical microstructure,and to further explore the mechanism of sludge reinforcement.The results show that the decrease range of water content is larger under higher voltage.The effect of soil treatment is more uniform and the average water content is reduced to 56%after adopting anode follow-up method.After electroosmosis-solidification treatment,the strength of solidified soil is significantly improved but not positively related to the dosage of curing agent.Curing age is helpful for better cementation between hydration products and soil particles,forming soil skeleton and improving soil strength under the optimum dosage of curing agent.

关 键 词：淤泥 电渗法 化学固化法 无侧限抗压强度 微观机理 

分 类 号：TU447[建筑科学—岩土工程]