摘要
选取南通某滩涂疏浚淤泥,实验研究初始含水率、含盐量、初始pH和有机质含量等4个关键物化因子对滩涂淤泥的水泥固化早期无侧限抗压强度(UCS)的影响,并对影响机理进行了分析。结果表明,淤泥初始含水率越高,固化土的UCS相应越低;Cl-和SO_4^(2-)含量对早期UCS的影响存在临界值,分别为13.55 g·kg^(-1)和8.71 g·kg^(-1),在对应临界值内,3d和7 d UCS均随着离子含量的增加而升高,具有早强效果,超过临界值后,UCS均随着离子含量的增加而降低;淤泥初始pH的升高有利于早期固化强度的增长;有机质含量对早期UCS的影响并不显著。五因素四水平正交实验分析表明,各因素对早期强度的影响大小为:初始含水率>Cl-含量>初始pH>SO_4^(2-)含量>有机质含量,初始含水率的影响最为显著。该研究结果对淤泥的进一步快速固化研究具有重要的意义。
The sediments in this study were sampled from a mud-flat in Nantong. The main aim of this study was to research the influence of initial moisture content,saltiness,initial pH,and organic content of sediments on their early unconfined compressive strength（ UCS）. The mechanisms of these forms of influence are discussed.The results show that the higher the moisture content,the lower the UCS. There are critical values of the contents of Cl-and SO4^（2-）,（ 13. 55 and 8. 71 g·kg^-1,respectively）. The corresponding UCS（ 3 d and 7 d） increased with increase in the Cl-and SO4^（2-） content,within the critical values. However,when the contents,especially the SO4^（2-） content,exceeded the critical values,the UCS decreased conversely. The initial pH favored the growth of early compressive strength. The variation of UCS was not so obviously associated with the increase of organic content. The results of orthogonal analysis showed the order of significance of these factors： initial moisture content 〉content of Cl- 〉initial pH 〉content of SO4^（2-）〉 organic content. The effect of the initial moisture is the most significant. These results have great significance for further research on rapid sediment solidification.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第8期4766-4774,共9页
Chinese Journal of Environmental Engineering
基金
江苏高校优秀学科建设工程资助项目(PAPD)
江苏省普通高校研究生科研创新计划项目(KYZZ15_0147)
江苏省水利科技项目,复合防渗新材料开发及其在灌区节水工程中示范应用(1061-51400212)
水利部“948”项目,水中痕量挥发性有机物检测系统(30155045912)
国家重大仪器设备开发专项经费,原子荧光重金属在线监测设备的开发与应用(2014YQ060773)
关键词
含水率
含盐量
PH
有机质
早期抗压强度
正交分析
快速固化
moisture content
saltness
pH
organic content
early confined compressive strength
orthogonal analysis
fast solidification
