Effect of Polyacrylamide on Improvement of Dredger Fill with Vacuum Preloading Method

被引:49
作者
Lei, Huayang [1 ,2 ]
Xu, Yinggang [3 ]
Li, Xin [3 ]
Jiang, Mingjing [3 ]
Liu, Liangzhi [4 ]
机构
[1] Tianjin Univ, Dept Civil Engn, Educ Minist, Key Lab Coast Civil Struct Safety, 135 Yaguan Rd, Tianjin 300350, Peoples R China
[2] Tongji Univ, Coll Civil Engn, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China
[3] Tianjin Univ, Dept Civil Engn, Tianjin 300350, Peoples R China
[4] Tianjin Univ, Geotech Engn Inst, Tianjin 300350, Peoples R China
基金
中国国家自然科学基金;
关键词
Polyacrylamide; Dredger fill; Vacuum preloading; Consolidation; Vane shear strength; SOFT BANGKOK CLAY; VERTICAL DRAINS; STRENGTH DEVELOPMENT; SOIL; SOLIDIFICATION; STABILIZATION; CONSOLIDATION; PRESSURE; SLURRY;
D O I
10.1061/(ASCE)MT.1943-5533.0002860
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Dredger fill possesses undesirable engineering properties due to high water content, compressibility, and low permeability, causing insufficient consolidation and long treatment periods using a vacuum preloading method. This paper investigates an advanced treatment method using chemically additive polyacrylamide (PAM) on dredger fill combined with a vacuum preloading method via laboratory model tests. Anionic polyacrylamide (APAM, a PAM class based on ionic classification) exhibited better performance on accelerating water discharge, reducing the time for trial filtration tests almost in half, and so was adopted in vacuum preloading model tests. The test results show that the application of APAM reduces 30% to 50% of the dredger fill consolidation time, accelerates the dissipation of excess pore pressure, and reduces the vacuum loss in vertical transition for the whole treatment duration. The vane shear strength post-treatment was observed to increase by 30% to 55% with an additive percentage of 30 mg/L of APAM, which is proposed for the treatment of Tianjin Binhai dredger fill. The results provide a novelty approach to the physical mechanical alteration of dredged fill to break through the unsatisfactory limitation of conventional vacuum preloading treatment.
引用
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页数:8
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