A series of tests were conducted to investigate the consolidation mechanism and effect of the combined application of electro-osmosis drainage and preloading. Test results for consolidation with variable voltage gradient, consolidation with variable loads and consolidation with constant preloading loads were presented and discussed. Current, soil flow, soil moisture content, displacement, soil conductivity, soil pH and other indicators were monitored during the tests. The effect of preloading loads and voltage gradient on electro-osmosis drainage was explored and the corresponding relationship between the preloading loads and the voltage gradient was established. The test results indicate that, compared to improved electro-osmosis voltage, increasing preloading loads can increase soil flow significantly. Preloading loads can increase soil flow at the cathode outfall. The effect of soil treatment with 40 kPa preloading loads is roughly equal to that of electro-osmotic consolidation with 0.5 V/cm voltage gradient. The effect of electro-osmotic consolidation with 1 V/cm voltage gradient is roughly equal to that of preloading with 50∼60 kPa loads.Compared to the effect of electro-osmosis drainage or preloading, the combined application of preloading and electro-osmosis drainage can significantly improve the effect of soil treatment.
LIU Fei-yu , ZHANG Le , WANG Jun , ZHANG Bin
. Experimental Study on Electro-Osmosic Consolidation of Soft Clay under Preloading and Variable Voltage[J]. Journal of Shanghai University, 2014
, 20(2)
: 228
-238
.
DOI: 10.3969/j.issn.1007-2861.2013.07.005
[1]曹永华,高志义,刘爱民.地基处理的电渗法及其进展[J].水运工程, 2008(4): 92-95.
[2] Esrig M I. Pore pressure, consolidation and electrokinetics [J]. Journal of the SMFD, American Society of Civil Engineers, 1968, 94(4): 899-921.
[3]苏金强,王钊.电渗的二维固结理论[J].岩土力学, 2004, 25(1): 125-131.
[4]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.
[5]庄艳峰,王钊.电渗的电荷累积理论[J].岩土力学, 2005, 26(4): 629-632.
[6]庄艳峰,王钊,林请.电渗的能级梯度理论[J].哈尔滨工业大学学报, 2005, 37(2): 283-286.
[7]邹维列,杨金鑫.电动土工合成材料用于加固和加筋设计 [J].岩土工程学报, 2002, 24(3): 319-322.
[8] Glendinning S, Jones C J F P, Pugh RC. Reinforced soilusingcohesive ?llandelectrokinetic geosynthetics [J]. International Journal of Geomechanics, 2005, 5(2): 138-146.
[9] Glendinning S, Lamont-Black J, Jones C J F P. Treatment of sewage sludge using elecrokinetic geosynthetics [J]. Journal of Hazardous Materials, 2006, 139(3): 491-499.
[10]李瑛,龚晓南,焦丹,等.软茹土二维电渗固结性状的试验研究 [J].岩石力学与工程学报, 2009, 28(S2): 4034-4039.
[11]李瑛,龚晓南,卢萌盟,等.堆载-电渗联合作用下的祸合固结理论[J].岩土工程学报, 2010, 32(1): 77-81.
[12]李瑛,龚晓南,张雪蝉.电压对一维电渗排水影响的试验研究[J].岩土力学, 2011, 32(3): 709-714.
[13]曹永华,高志义.电渗法中排水固结理论与实践的若干问题[J].中国港湾建设, 2010, 167(3): 22-24.
[14] Hong H Q, Hu L M. Experimental study of electro-osmosis by reversing polarity in kaolin clay [C]//The 1st Sri Lankan Geotechnical Society International Conference on Soil and Rock Engineering. 2007: 7-11.
[15] Shang J Q. Vacuum and surcharge combined one-dimensional consolidation of clay soils [J]. Canadian Geotechnical Journal, 2002, 39(5): 1126-1138.
