EKG电极真空–电渗处理软黏土室内试验研究
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摘要
针对真空–电渗法在软基处理中存在金属电极易腐蚀,试验后期排水效率低等问题,利用自主研发的装置试验了EKG电极在电渗法、真空预压法、真空–电渗法、阴极直排式真空–电渗法下的排水效果,通过监测排水量、电流、pH值、沉降和处理后的强度等指标将上述方法进行比较,结果表明:(1)真空–电渗法处理后排水量最大,沉降更明显,土体强度更大;(2)阴极直排法在前8 h,排水量高于双侧排水真空–电渗法,土体内pH值更稳定,土体表面更均匀;阴极直排法能在一定时间内改善传统真空–电渗法在阳极真空预压与电渗相互抑制的情况,如果将阴极直排法与双侧排水真空–电渗法相结合,能够为扩大真空–电渗联合法的应用范围提供新的研究思路。
Considering the existence of metal electrode corrosion and low efficiency in the late period of the conventional electro-osmosis in combination with the vacuum preloading method, the drainage effects of the electro-osmosis method, vacuum preloading method, vacuum preloading method in combination with electro-osmosis and cathode straight drainage method are investigated by using the self-developed device. By monitoring the drainage amounts, electricities, pH, settlements and strengths, the treatment effects of the above methods are compared. The results between the two kinds of vacuum preloading methods in combination with electro-osmosis are also compared. It is shown that:(1) The drainage amount of soil treatment using the vacuum preloading method in combination with electro-osmosis is the largest, and the strength and settlement are both larger than those of other methods;(2) The drainage amount of the cathode straight drainage method is larger than that of the vacuum preloading method in combination with electro-osmosis in the initial eight hours, the pH value is more stable, and the surface of soil is more uniform. Furthermore, the inhibition between the vacuum preloading and the electro-osmosis can be improved by using the cathode straight drainage method. Therefore, a new research idea is proposed for the enlargement of application range for the electro-osmosis in combination with the vacuum preloading method, that is, the cathode straight drainage method and the electro-osmosis in combination with the vacuum preloading method can be combined for soil treatment.
Considering the existence of metal electrode corrosion and low efficiency in the late period of the conventional electro-osmosis in combination with the vacuum preloading method, the drainage effects of the electro-osmosis method, vacuum preloading method, vacuum preloading method in combination with electro-osmosis and cathode straight drainage method are investigated by using the self-developed device. By monitoring the drainage amounts, electricities, pH, settlements and strengths, the treatment effects of the above methods are compared. The results between the two kinds of vacuum preloading methods in combination with electro-osmosis are also compared. It is shown that:(1) The drainage amount of soil treatment using the vacuum preloading method in combination with electro-osmosis is the largest, and the strength and settlement are both larger than those of other methods;(2) The drainage amount of the cathode straight drainage method is larger than that of the vacuum preloading method in combination with electro-osmosis in the initial eight hours, the pH value is more stable, and the surface of soil is more uniform. Furthermore, the inhibition between the vacuum preloading and the electro-osmosis can be improved by using the cathode straight drainage method. Therefore, a new research idea is proposed for the enlargement of application range for the electro-osmosis in combination with the vacuum preloading method, that is, the cathode straight drainage method and the electro-osmosis in combination with the vacuum preloading method can be combined for soil treatment.
引文
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[2]焦丹,龚哓南,李瑛.电渗法加固软土地基试验研究[J].岩石力学与工程学报,2011,30(增刊1):3028-3216.(JIAO Dan,GONG Xiao-nan,LI Ying.Experimental study of consolidation of soft clay using electro-osmosis method[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(S1):3028-3216.(in Chinese))
[3]庄艳峰,王钊.电渗固结中的界面电阻问题[J].岩土力学,2004,25(1):117-120.(ZHUANG Yan-feng,WANGZhao.Study on interface electric resistance of electro-osmotic consolidation[J].Rock and Soil Mechanics,2004,25(1):117-120.(in Chinese))
[4]陈卓,周建,温晓贵,等.电极反转对电渗加固效果的试验研究[J].浙江大学学报(工学版),2013,47(9):1579-1584.(CHEN Zhuo,ZHOU Jian,WEN Xiao-gui,et al.Experimental research on effect of polarity reversal to electro-osmotic[J].Journal of Zhejiang University(Engineering Science),2013,47(9):1579-1584.(in Chinese))
[5]CHEW S H,KARUNARATNE G P,KUMA V M,et al.A field trial for soft clay consolidation using electric vertical drains[J].Geotextiles and Geomembranes,2004,22(1):17-35.
[6]吴辉,胡黎明.真空预压与电渗固结联合加固技术的理论模型[J].清华大学学报(自然科学版),2012,52(2):182-185.(WU Hui,HU Li-ming.Analytical models of the vacuum preloading and electro-osmosis consolidation for ground stabilization[J].Journal of Tsinghua University(Sci&Tech),2012,52(2):182-185.(in Chinese))