纤维加筋优化电渗法处理疏浚淤泥的试验研究

doi:10.13722/j.cnki.jrme.2020.1199

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摘要为缓解电渗法加固疏浚淤泥过程中土体开裂严重的问题，通过在疏浚淤泥中添加聚丙烯纤维的方式提高电渗处理效果。通过设计3种纤维长度(6，9，12 mm)和5种掺入比(0.1%，0.2%，0.3%，0.4%，0.5%)下室内电渗模型试验，对电渗固结过程的排水量、电流强度和电势值进行监测并测量试验前后的含水量及十字板抗剪强度，探究不同长度和掺入比的聚丙烯纤维对于电渗法固化疏浚淤泥的改进效果。试验结果表明：不同聚丙烯纤维长度及掺入比对电渗效果的影响有显著差异；聚丙烯纤维加入疏浚淤泥后可有效抑制电渗过程中土体产生的裂缝，使排水效率增加；纤维长度为9 mm、掺入比为0.3%的试验组产生了最佳效果；与不加纤维的疏浚淤泥电渗固结相比，排水量和十字板剪切强度分别增加31.6%和87.5%；添加纤维处理后的土体整体性及对电流衰减的抑制效果好，土体表面裂缝减少，改善效果十分显著。

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	刘飞禹1
	汤家郗1
	袁国辉2
	王军2
	符洪涛2

关键词 ：土力学, 电渗, 疏浚淤泥, 聚丙烯纤维, 纤维长度, 掺入比

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.

Key words： soil mechanics electro-osmosis dredged slurry polypropylene fiber fiber length mixing ratio

引用本文:

刘飞禹1，汤家郗1，袁国辉2，王军2，符洪涛2. 纤维加筋优化电渗法处理疏浚淤泥的试验研究[J]. 岩石力学与工程学报, 2021, 40(12): 2545-2552.
LIU Feiyu1，TANG Jiaxi1，YUAN Guohui2，WANG Jun2，FU Hongtao2. Experimental study on treatment of dredged slurry by electro-osmosis with fiber reinforcement#br#. , 2021, 40(12): 2545-2552.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1199 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I12/2545

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