软土电动化学注浆加固技术室内试验研究
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摘要
以滨绥(哈尔滨—绥芬河)铁路一段地基中软土为试验对象,开展电动化学注浆加固试验,研究试验过程中土体中的电流、排水量和能耗,探讨CaCl2溶液对土体的改性加固效果。试验结果表明:黏土的排水量受土体含水率和电流的影响,随着土体的胶结范围不断扩大,电流不断减小,排水速率不断降低; CaCl2溶液中的Ca2+在电势梯度的作用下发生胶化作用,从而加固阴极区域的土体;电动化学注浆能够以较小的能耗有效提升土体的承载力。
The soft soil in the foundation of a section of Harbin-Suifenhe railway is the research background in this paper.The electrochemical grouting reinforcement test was carried out to study the current,water displacement and energy consumption in soil during the test process. The effect of CaCl_2 solution on soil modification and reinforcement was discussed.The test results showthat the water displacement of clay is influenced by the moisture content and current.W ith the continuous expansion of the cementation range of soil,the current decreases and the drainage rate decreases. Due to the action of potential gradient,calcium ions in CaCl_2 solution are gelatinized to reinforce soil in the cathode area. Electrochemical grouting can effectively improve soil bearing capacity with less energy consumption.
The soft soil in the foundation of a section of Harbin-Suifenhe railway is the research background in this paper.The electrochemical grouting reinforcement test was carried out to study the current,water displacement and energy consumption in soil during the test process. The effect of CaCl_2 solution on soil modification and reinforcement was discussed.The test results showthat the water displacement of clay is influenced by the moisture content and current.W ith the continuous expansion of the cementation range of soil,the current decreases and the drainage rate decreases. Due to the action of potential gradient,calcium ions in CaCl_2 solution are gelatinized to reinforce soil in the cathode area. Electrochemical grouting can effectively improve soil bearing capacity with less energy consumption.
引文
[1]MORRIS D V,HILLIS S F,CALDWELL J A.Improvement of Sensitive Silty Clay by Electroosmosis:Reply[J]. Canadian Geotechnical Journal,2011,22(1):17-24.
[2]CASAGRANDE I L.Electro-osmosis in Soils[J].Geothechnique,1949,1(1):159-177.
[3]GASSEN W V,SEGO D C. Electro-osmosis in Frozen Soil[J]. Cold Regions Science and Technology,1991,19:253-259.
[4]LEWIS R W,HUMPHESON C.Numerical Analysis of Electro-osmotic Flow in Soils[J]. Journal of the Soil Mechanics&Foundations Division,1973,99:603-616.
[5]TRUSHINSKII M Y.Electrochemical Soil Stabilization Method[J]. Soil Mechanics and Foundation Engineering,1993,30(2):61-65.
[6]ALSHAWABKEH A N,SHEAHAN T C,WU X. Coupling of Electrochemical and Mechanical Processes in Soils Under DC Fields[J].Mechanics of Materials,2004,36(5/6):453-465.
[7]TANG X,XUE Z,YANG Q,et al. Water Content and Shear Strength Evaluation of Marine Soil After Electro-osmosis Experiments[J].Drying Technology,2017,35(14):1696-1710.
[8]SCHMIDT C A B,BARBOSA M C,ALMEIDA M S S.A Laboratory Feasibility Study on Electrokinetic Injection of Nutrients on an Organic,Tropical,Clayey Soil[J].Journal of Hazardous Materials,2007,143(3):655-661.
[9]简绍绮.电渗透化学灌浆地盘改良之研究[D].台北:国立台湾科技大学,2003.
[10]王宁伟,刘铁,于辉,等.电化学注浆加固软土效果的试验研究[J].水利与建筑工程学报,2017,15(6):7-11.
[11]ESRIG M L,GEMEINHARDT J P.Electrokinetic Stabilization of an Illitic Clay[J].Journal of Soil Mechanics&Foundations Division,1967,92(S3):109-128.
[2]CASAGRANDE I L.Electro-osmosis in Soils[J].Geothechnique,1949,1(1):159-177.
[3]GASSEN W V,SEGO D C. Electro-osmosis in Frozen Soil[J]. Cold Regions Science and Technology,1991,19:253-259.
[4]LEWIS R W,HUMPHESON C.Numerical Analysis of Electro-osmotic Flow in Soils[J]. Journal of the Soil Mechanics&Foundations Division,1973,99:603-616.
[5]TRUSHINSKII M Y.Electrochemical Soil Stabilization Method[J]. Soil Mechanics and Foundation Engineering,1993,30(2):61-65.
[6]ALSHAWABKEH A N,SHEAHAN T C,WU X. Coupling of Electrochemical and Mechanical Processes in Soils Under DC Fields[J].Mechanics of Materials,2004,36(5/6):453-465.
[7]TANG X,XUE Z,YANG Q,et al. Water Content and Shear Strength Evaluation of Marine Soil After Electro-osmosis Experiments[J].Drying Technology,2017,35(14):1696-1710.
[8]SCHMIDT C A B,BARBOSA M C,ALMEIDA M S S.A Laboratory Feasibility Study on Electrokinetic Injection of Nutrients on an Organic,Tropical,Clayey Soil[J].Journal of Hazardous Materials,2007,143(3):655-661.
[9]简绍绮.电渗透化学灌浆地盘改良之研究[D].台北:国立台湾科技大学,2003.
[10]王宁伟,刘铁,于辉,等.电化学注浆加固软土效果的试验研究[J].水利与建筑工程学报,2017,15(6):7-11.
[11]ESRIG M L,GEMEINHARDT J P.Electrokinetic Stabilization of an Illitic Clay[J].Journal of Soil Mechanics&Foundations Division,1967,92(S3):109-128.