生物炭添加对固化疏浚泥压缩性状和渗透性状影响研究
2021-01-05宋苗苗吴振威曹裕翔
宋苗苗 吴振威 曹裕翔

摘 要:为明确生物炭添加对固化高含水率疏浚泥压缩性状和渗透性状的影响,该文对生物炭改良固化疏浚泥开展了一维压缩试验和柔性壁渗透试验。基于试验结果,对固化高含水率疏浚泥压缩性状和渗透性状随生物炭掺量的变化规律进行了研究,并分析了生物炭添加引起其压缩性状和渗透性状变化的原因。结果表明,生物炭添加将引起固化高含水率疏浚泥压缩性和渗透系数的减小,且减小幅度随生物炭掺量的增加是变化的。对于研究所用固化疏浚泥,生物炭掺量以在(5%,15%)范围内为宜。
关键词:固化疏浚泥 高含水率 生物炭 压缩性状 渗透系数
中图分类号:TU44 文献标识码:A 文章编号:1672-3791(2021)11(a)-0000-00
Experimental Study on Compressive-Hydraulic Properties of Biochar-Amended Cemented Dredged Clay
SONG Miaomiao WU Zhenwei CAO Yuxiang
(School of Civil Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051 China)
Abstract: A series of one-dimensional compression tests and permeability tests were conducted to investigate the biochar effects on the compressive and hydraulic behavior of cemented dredged clay at high water content. The related mechanisms responsible for changes were also discussed. Based on test results, it can be found that the addition of biochar would induce a reduction in the compressibility and permeability coefficient for cement-treated dredged clay. Meanwhile, the decrease is affected by the biochar content. For cemented dredged clay used in this research, the appropriate biochar is in the range of (5%, 15%).
Key Words: Cemented dredged clay; High water content; Biochar; Compression behavior; Permeability coefficient
为改善港口、河道、湖泊等的水质、通航能力等,我国每年都要对其进行大规模的疏浚清淤,从而产生大量的高含水率疏浚淤泥[1-2]。此外,人工岛修筑、港口建设等工程也需要进行大量的海底清淤。疏浚泥通常呈流动状态,具有含水率高、压缩性大、强度非常低的特点,故一般作为废弃物进行处理。常用的吹填和抛泥两种方法,不仅需占用大量土地,还易污染周边环境。而疏浚泥的固化资源化利用,不仅可解决疏浚泥弃置占用大量土地、污染环境的问题,还可变废为宝为港口建、人工岛等修筑提供大量的理想填料[3-4]。国内外一些学者也通过室内试验、现场试验、实际工程等验证了将固化疏浚泥作为理想填料是可行的[5-6]。
水泥因具有材料来源广、价格低廉、性能良好等特点,成为目前实际工程中最常用的固化剂。……
