电解减饱和法处理可液化地基的现场试验研究

发布时间：2018-01-07 16:10

本文关键词：电解减饱和法处理可液化地基的现场试验研究　出处：《岩土工程学报》2017年05期 　论文类型：期刊论文

【摘要】：电解减饱和法是近年来提出的一种处理可液化地基的新方法,通过电解饱和地基中的孔隙水生成气体,达到减小地基饱和度并提高抗液化强度的目的。采用石墨毡为电极,开展恒定电流强度下的现场电解减饱和试验研究。通过地基压缩波速试验测得电解作用下地基深部的饱和度从98.2%减小至94%。着重分析了地基土在电解过程中的电学特性,试验结果表明:等效电阻随着饱和度的减小而逐渐增大,呈现出较好的单值函数关系;随着电流强度的增大,等效电阻的增长速率越高,其电阻增幅也越快,达到最大等效电阻所消耗的电量先逐渐增大,然后再趋于平缓;虽然增大电流强度会略微增加耗电量,但是可以显著提高电解减饱和法效率。此外,等效电阻的衰减过程可以分为快速衰减、平缓衰减和稳定3个阶段,其中快速衰减阶段为停止电解3 h内,等效电阻的平均衰减速率为11Ω/h;由于试验场地位于河边,电解产生的气泡易受渗流的影响,使其难以长期维持在正负极间土层中;然而在该阶段,其电阻降幅也仅有15%,使可液化地基仍维持着较好的抗液化能力。对地基二次或多次电解,可以大幅节省耗电量,约为首次电解的30%;而且还能加快地基正负极间土层中气泡的生成量,从而有效减小饱和度,提高电解减饱和法效率以及地基的抗液化能力。
[Abstract]:Electrolytic desaturation method is a new method for treating liquefiable foundation in recent years. Gas is generated by electrolytic saturation of pore water in the foundation. In order to reduce the saturation of the foundation and improve the liquefaction resistance, graphite felt was used as the electrode. The in situ electrolytic desaturation test under constant current strength was carried out. The saturation of the deep foundation was reduced from 98.2% to 94 under the action of electrolysis through the compression wave velocity test of the foundation. The emphasis was placed on the analysis of the electric properties of the foundation soil. The electrical properties of the solution. The experimental results show that the equivalent resistance increases gradually with the decrease of saturation, showing a good single-valued function relationship. With the increase of the current intensity, the higher the growth rate of the equivalent resistance, the faster the increase of the resistance, and the electricity consumption to reach the maximum equivalent resistance increases gradually and then tends to flat. Although increasing the current intensity will slightly increase the power consumption, it can significantly improve the efficiency of the electrolytic desaturation method. In addition, the decay process of the equivalent resistance can be divided into three stages: fast attenuation, gentle attenuation and stabilization. The fast decay stage is within 3 hours of stopping electrolysis, and the average attenuation rate of the equivalent resistance is 11 惟 / h. Because the test site is located on the riverside, the bubbles produced by electrolysis are easy to be affected by seepage, which makes it difficult to maintain in the soil layer between positive and negative poles for a long time. However, at this stage, the resistance decrease is only 15%, so that the liquefiable foundation still maintains a good anti-liquefaction ability. The second or multiple electrolysis of the foundation can save the electricity consumption substantially, about 30% of the first electrolysis; It can also accelerate the formation of bubbles in the soil layer between the positive and negative poles, thus effectively reducing the saturation, improving the efficiency of the electrolytic desaturation method and the anti-liquefaction ability of the foundation.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学土木与交通学院;江阴市人民政府重点工程建设办公室;
【基金】：国家自然科学基金面上项目(51379067) 重点国际合作研究项目(51420105013) 河海大学中央高校基本科研业务费项目(2015B17314)
【分类号】：TU472.5
【正文快照】： attenuation stage indicates that the liquefiable foundation canstill maintain good liquefaction resistance.Then it cansignificantly save lots of power consumption by electrolyzingthe liquefiable foundation twice or more times,which is about 30%of the fir

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