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| Self-consolidation characteristics of the dredged fill under different hydro-chemical conditions |
| LEI Huayang1，2，ZHANG Weidi 1，BO Yu1，WANG Lei 1，WANG Peng1 |
| (1. School of Civil Engineering，Tianjin University，Tianjin 300350，China；2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education，Tianjin University，Tianjin 300350，China) |
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Abstract In order to investigate the effect of hydro-chemical conditions on the self-weight settlement of dredged fill，the cylinder settlement test was carried out in this study，and the settlement and settlement rate were analyzed. In addition，the change in the ion content of the supernatant was determined by titration tests after the sedimentation，and the effect of hydro-chemical conditions on the self-consolidation of dredged fill and the respectively micro-mechanism were investigated. The results show that both alkaline(pH = 10) and acidic(pH = 2) conditions could effectively improve the settlement rate of the dredged fill at initial stage，while the final settlement gradually decreased with the increase of pH value. With the increase of Ca2+ content，the settlement and the settlement rate of dredged fill increased under acidic and neutral conditions，and the settlement and settlement rate of dredged fill showed a trend of increasing first，then decreasing and finally being stable under alkaline condition. The results in this study are meaningful for improving the settlement of dredged fill.
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2020, Vol. 39 
