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| Experimental study on treatment of dredged slurry by electro-osmosis with fiber reinforcement#br# |
| LIU Feiyu1，TANG Jiaxi1，YUAN Guohui2，WANG Jun2，FU Hongtao2 |
| (1. Department of Civil Engineering，Shanghai University，Shanghai 200444，China；2. School of Civil Engineering and Architecture，Wenzhou University，Wenzhou，Zhejiang 325035，China) |
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Abstract In order to alleviate serious soil cracking in the dredged slurry reinforced by electro-osmosis method，the polypropylene fiber is added to the dredged slurry to improve the effect of electro-osmosis treatment. Through 16 groups of indoor electro-osmosis model tests with three kinds of fiber length of 6，9 and 12 mm as well as five mixing ratios，the drainage，the current intensity and the potential value in the electro-osmosis consolidation process were monitored. The water content and the vane shear strength were measured before and after testing. The improved effects of the length and the mixing ratio of the polypropylene fiber on the electro-osmotic solidification of dredged slurry were explored. The test results show that the polypropylene fibers with different lengths and different mixing ratios have significantly different effects on electro-osmosis. The polypropylene fiber added to dredged slurry can effectively inhibit the cracks in the soil during the process of electro-osmosis and increase the drainage efficiency. The test group with a fiber length of 9 mm and a blending ratio of 0.3% has the best effect. Compared with the electro-osmosis consolidation of dredged slurry without fiber，the drainage and the cross-plate shear strength increase by 31.6% and 87.5%，respectively. Adding fiber will increase the soil integrity，inhibit current attenuation and reduce the surface cracks of the soil，showing that the improvement effect is very significant.
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2021, Vol. 40 
