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基桩施工时废弃泥浆的絮凝试验

Flocculation Test of Waste Mud during Foundation Pile Construction
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摘要 为了提高基桩施工时废弃泥浆的脱水效果,以雄商高铁站前8标基桩施工为研究对象,阐述了向废弃泥浆中添加絮凝剂、进行烧杯絮凝试验、真空抽滤试验、扫描电镜试验的过程,研究了絮凝剂的种类以及添加量对絮凝过程的影响,结果表明:使用阳离子型聚丙烯酰胺(CPAM)、非离子型聚丙烯酰胺(NPAM)以及它们与聚合氯化铝(PAC)的组合均能促进絮团的大块形成,其滤饼含水率低、颗粒间孔隙占比小、脱水能力强。其中四种效果较好的絮凝剂配比方案为:单独使用0.3%浓度的CPAM(投加量为5%)或0.3%浓度的NPAM(投加量为4%),以及这两种聚丙烯酰胺与5%浓度的PAC(投加量为3%)的组合。得出基桩施工时对废弃泥浆的脱水处理可以采用以上絮凝剂类型及组合,能够促进其资源化利用和环境保护的结论。 In order to improve the dehydration effect of the waste mud of the foundation piles,taking the construction of foundation piles of the 8 sections in front of Xiongshang High-speed Railway Station as the research object,this paper expounds the influence of the type and amount of flocculants on the flocculation process by adding flocculant to the waste mud,conducting beaker flocculation test,vacuum extraction test,scanning electron microscope test.The results show that the use of cationic polyacrylamide(CPAM),non-ionic polyacrylamide(NPAM),and their combination with polyaluminum chloride(PAC)can promote the formation of large blocks,low water content of filter cake,small proportion of intergranular pores,and strong dehydration ability.Four of the more effective flocculant solutions are:0.3%CPAM(dosage of 5%)or 0.3%NPAM(dosage of 4%),and a combination of the two polyacrylamide and 5%PAC(dosage of 3%).The above types and combinations of flocculant can be used in the dehydration treatment application of waste mud in foundation pile construction to promote its resource utilization and environmental protection.
作者 王峥岩 WANG Zhengyan(Sinohydro Bureau 5 Co.,Ltd.,Chengdu Sichuan 610066)
出处 《四川水力发电》 2024年第S02期24-28,共5页 Sichuan Hydropower
关键词 泥浆 脱水效率 絮凝剂 滤饼含水率 扫描电镜图像 基桩 絮凝试验 Mud Dehydration efficiency Flocculant Water content of filter cake Scanning electron microscope image Foundation pile Flocculation test
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