周期性裂缝灌浆对电渗处理淤泥软土的影响

刘飞禹, 周杰, 王军, 李玲玉

doi:10.12066/j.issn.1007-2861.2219

上海大学学报(自然科学版) >

2020 , Vol. 26 >Issue 4: 651 - 661

DOI: https://doi.org/10.12066/j.issn.1007-2861.2219

研究论文

周期性裂缝灌浆对电渗处理淤泥软土的影响

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1.上海大学土木工程系,上海 200444
2.温州大学建筑工程学院,浙江温州 325035

收稿日期: 2017-04-10

网络出版日期: 2020-09-03

基金资助

国家自然科学基金资助项目(51878402)

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Influence of intermittent fracture grouting electro-osmosis for dredged slurry strengthening

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1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China
2. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, China

Received date: 2017-04-10

Online published: 2020-09-03

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摘要

电渗过程中由于土体裂缝的开展导致土体电阻增大、电渗效率降低,裂缝灌浆是解决这个问题的方法之一。在等电势梯度的前提下,设计了 5 组一维固结电渗对比试验,并采用质量分数为 1.5% 的 NaOH 溶液进行裂缝灌浆,通过对比不同频率下电渗试验的排水量、排水速率、沉降等数据,分析了灌浆频率对电渗加固效果的影响。结果表明,裂缝灌浆能明显提高电渗加固的效果;试验存在最优灌浆频率,且当采用最优频率时,可延长电渗通电时间,使得土体含水量和有效排水能耗降到最低。

关键词： 电渗; 裂缝灌浆; 周期性; 淤泥软土

本文引用格式

刘飞禹, 周杰, 王军, 李玲玉 . 周期性裂缝灌浆对电渗处理淤泥软土的影响[J]. 上海大学学报(自然科学版), 2020 , 26(4) : 651 -661 . DOI: 10.12066/j.issn.1007-2861.2219

Abstract

During electro-osmosis, the electrical resistance of the soil increases and electro-osmotic efficiency decreases owing to the appearance of fractures in the soil. Fracture grouting is a method that can be applied to solve this problem. In this study, under the equipotential premise gradient, experimental laboratory tests through electro-osmosis were performed to investigate the effects of various fracture-grouting intermittence frequencies using 1.5% NaOH solution on each of five dredged slurry samples. The results were analysed based on the extracted water mass, drainage rate, surface settlement, electric current, energy consumption effect, water content, and undrained vane shear strength. The results showed that fracture grouting could improve the effect of electro-osmosis. In addition, the experimental findings indicated that an optimal grouting ratio existed, which effectively decreased the water content, increased the vane shear strength, and reduced the energy consumption effect.

Key words： fracture grouting; electro-osmosis; intermittence; dredged slurry

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