粉质黏土地层盾构废弃泥浆处理絮凝剂配比优化试验研究

Test Study on Optimization of Flocculant Proportion for Shield Waste Slurry Treatment in Silty Clay Stratum

文章针对粉质黏土地层超大直径泥水盾构废弃泥浆处理的难题,结合济泺路穿越黄河隧道工程,对泥浆处理过程中添加的絮凝剂开展了室内试验研究,对比了有机絮凝剂和无机絮凝剂的水分离析效果,并对絮凝剂添加量进行了优选。试验结果表明:阳离子型聚丙烯酰胺(CPAM)可有效降低泥浆的含水率,阴离子型聚丙烯酰胺(APAM)和非离子型聚丙烯酰胺(NPAM)均无法有效降低泥浆的含水率。添加无机絮凝剂聚合氯化铝(PAC)后,泥浆水分离析较缓慢,水分离析效果不好。当阳离子型聚丙烯酰胺(CPAM)添加量为0.09%~0.12%时,比阻达到最小值,水分离析性能最优。

Aiming at the difficult problem of waste slurry treatment of super-large diameter slurry shield in silty clay stratum,combined with the engineering of Jinluo Road crossing the Yellow River Tunnel,this paper carries out an indoor test study on the fl occulant added in the process of slurry treatment,compares the water segregation effect of the organic fl occulant and the inorganic fl occulant,and makes a preferred selection for the amount of the fl occulant added.The test results show that cationic polyacrylamide(CPAM)can effectively reduce the water content of slurry,and anionic polyacrylamide(APAM)and non-ionic polyacrylamide(NPAM)can not effectively reduce the water content of slurry.After adding inorganic fl occulant polymeric aluminum chloride(PAC),the slurry's water segregation is slow and the water segregation effect is not good.When the addition amount of cationic polyacrylamide(CPAM)is 0.09%-0.12%,the specific resistance reaches the minimum value,and the water segregation performance is the best.