掺加固化剂后放置时间对底泥固化效果的影响  

Effect of Storage Time after Adding Curing Agent on Curing Effect of Sediment

作　　者：王志 武利强[1,2] 张超杰 倪立建[3] WANG Zhi;WU Li-qiang;ZHANG Chao-jie;NI Li-jian(Zhejiang Institute of Water Resources and Estuary,Hangzhou 310020,China;Zhejiang Provincial Key Laboratory of Water Resources Disaster Prevention and Reduction.Hangzhou 310020,China;Zhejiang Water Resources and Hydropower Engineering Quality and Safety Supervision and Management Center,Hangzhou 310020,China)

机构地区：[1]浙江省水利河口研究院,浙江杭州310020 [2]浙江省水利防灾减灾重点实验室,浙江杭州310020 [3]浙江省水利水电工程质量与安全监督管理中心,浙江杭州310020

出　　处：《水电能源科学》2021年第2期131-133,共3页Water Resources and Power

基　　金：浙江省科技厅重点计划研发项目(2017C03008);2019年度浙江省水利厅重大科技项目(RA1910)。

摘　　要：以水泥、粉煤灰为主固化剂对嘉兴市连三连四荡底泥进行固化处理,通过无侧限抗压强度试验,重点研究含水率为34%的土样掺加8%的固化剂后放置不同时间后再击实对固化底泥干密度和强度的影响,利用扫描电子显微镜(SEM)试验进行了解释,并分析其微观结构演化特征。结果表明,底泥掺加固化剂后,随着放置时间的增长,水泥水化反应使土体颗粒形成更大的土颗粒团聚体,从而改变土的性质,导致土体结构越来越疏松,固化底泥干密度和强度总体呈降低趋势。结果可为底泥固化工程提供理论与技术指导。The Liansan-Liansi Lake sediment in Jiaxing City,Zhejiang Province are selected as the research object.The cement and fly ash are the main curing agents for curing the sediment.Through the unconfined compressive strength test.this paper focuses on the study of the influence of the soil sample with a water content of 34%and 8%of curing a-gent after placing different times and compacting on the dry density and strength of the solidified sediment.The scanning electron microscope(SEM)experiment was used to explain the obtained rule and analyze its microstructure evolution characteristics.The results show that after the sediment is mixed with the curing agent,as the placement time increases,the cement hydration reaction causes the soil particles to form larger aggregates of soil particles and changes the properties of the soil,resulting in a looser soil structure;The dry density and strength of the solidified sediments generally showed a decreasing trend.T he research results can provide theoretical and technical guidance for the sediment solidification pro-ject.

关 键 词：底泥 固化剂 放置时间 SEM 微观结构 无侧限抗压强度 

分 类 号：X52[环境科学与工程—环境工程]