本文關(guān)鍵詞：電解減飽和法處理可液化地基的現(xiàn)場試驗研究　出處：《巖土工程學(xué)報》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 減飽和法 抗液化 飽和砂土地基 電解法 現(xiàn)場試驗 等效電阻

【摘要】：電解減飽和法是近年來提出的一種處理可液化地基的新方法,通過電解飽和地基中的孔隙水生成氣體,達(dá)到減小地基飽和度并提高抗液化強度的目的。采用石墨氈為電極,開展恒定電流強度下的現(xiàn)場電解減飽和試驗研究。通過地基壓縮波速試驗測得電解作用下地基深部的飽和度從98.2%減小至94%。著重分析了地基土在電解過程中的電學(xué)特性,試驗結(jié)果表明:等效電阻隨著飽和度的減小而逐漸增大,呈現(xiàn)出較好的單值函數(shù)關(guān)系;隨著電流強度的增大,等效電阻的增長速率越高,其電阻增幅也越快,達(dá)到最大等效電阻所消耗的電量先逐漸增大,然后再趨于平緩;雖然增大電流強度會略微增加耗電量,但是可以顯著提高電解減飽和法效率。此外,等效電阻的衰減過程可以分為快速衰減、平緩衰減和穩(wěn)定3個階段,其中快速衰減階段為停止電解3 h內(nèi),等效電阻的平均衰減速率為11Ω/h;由于試驗場地位于河邊,電解產(chǎn)生的氣泡易受滲流的影響,使其難以長期維持在正負(fù)極間土層中;然而在該階段,其電阻降幅也僅有15%,使可液化地基仍維持著較好的抗液化能力。對地基二次或多次電解,可以大幅節(jié)省耗電量,約為首次電解的30%;而且還能加快地基正負(fù)極間土層中氣泡的生成量,從而有效減小飽和度,提高電解減飽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.
【作者單位】： 河海大學(xué)巖土力學(xué)與堤壩工程教育部重點實驗室;河海大學(xué)土木與交通學(xué)院;江陰市人民政府重點工程建設(shè)辦公室;
【基金】：國家自然科學(xué)基金面上項目(51379067) 重點國際合作研究項目(51420105013) 河海大學(xué)中央高校基本科研業(yè)務(wù)費項目(2015B17314)
【分類號】：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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