吹填泥浆快速处理方法的室内试验研究

Experimental study on rapid treatment method for dredged slurry

为探讨高含水泥浆快速处理的方法,本研究提出联合化学絮凝、真空预压和二次掺灰3种方法于一体的处理方法,并对其进行室内试验验证其效果。试验结果表明:先掺入1%聚合氯化铝的泥浆,絮凝沉降1 d后,泥浆含水率可从300%降至100%;再对试样采取真空预压,泥浆含水率可降低至40.52%;最后,采用二次掺灰改性处理,泥浆含水率可降低至35.40%,达到可塑状态。此时,泥浆的无侧限抗压强度可达到60 kPa以上,满足普通地基的承载力要求。吹填泥浆的传统处理方法需耗时2~3 a,该方法仅需4~5 d,大幅度缩短工期。絮凝-真空预压-二次掺灰改性的联合处理方法是一种高效、价格低廉且能快速降低泥浆含水率的处理方法,可为类似工程提供借鉴。

In order to improve the rapid treatment method for high water content mud,a novel treatment method was proposed.The chemical flocculation,vacuum preloading and secondary ash mixing were combined in the method,the test was performed to verify the effect.The results show that the water content of slurry added with 1%polyaluminium chloride decreases from 300%to 100%after one day of flocculation sedimentation.And the water content can decrease to 40.52%by vacuum preloading.Furthermore,the moisture content of the slurry will decrease to 35.40%after the secondary ash mixing modification treatment,the treatment slurry can be plasticized at this time.The unconfined compressive strength can exceed 60 kpa,meeting the bearing capacity requirement of ordinary foundation.The traditional treatment method of dredged slurry will take 2~3 years,only 4~5 days are needed using the proposed method.The construction period will be cut down significantly.Those indicates the combined treatment is an efficient,low-cost and rapid method to reduce the water content of slurry.This method can provide reference for similar projects.