管状EKG电化学注浆软基加固试验研究
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摘要
传统真空预压法处理过后的软黏土往往需要进行二次处理以达到强度要求,传统电化学注浆法作为二次加固的重要方法,通过注入化学浆液提升土体强度,却受限于金属电极易腐蚀等问题难以推广应用.基于以上问题,利用自主研发的注浆试验装置,结合新型管状EKG电极对40%含水率的黏土进行1,1.5,2 mol/L浓度的电化学注浆试验,分别在阴阳极和中间位置处单独布置PVC注浆管.通过监测排水量、电流、电势和处理后的强度等指标进行对比分析,以检验管状EKG注浆法的试验效果并总结出合理适宜的注浆浓度和注浆方式.结果表明:(1)管状EKG电极能将注浆法和电渗法有机结合,能有效缓解传统电化学注浆中金属电极易腐蚀的问题,为注浆法提供新思路;(2)阴阳极和中间位置处PVC管分别注浆使得土体强度提升均匀,电化学注浆效果显著,并且必然存在浓度最佳值使得注浆效果最好,能够为电化学注浆法的研究进一步提供参考和指导.
The soft clay which is processed with vacuum preloading always needs to be secondarily processed tomeet the requirement of strength. However,as one of the important secondarily treatment,traditional electroosmoticchemical treatments suffer with the metal electrode corrosion and it is hard to be widely used. Based on these analyses,theelectroosmotic chemical treatment with different amount of solution CaCl_2 and Na_2SiO_3 is conducted and the injectionpipes are placed near the anode,the cathode and the center with the usage of new EKG in a self-developed injectiondevice. By monitoring drainage amount,electricity,potential and strength after treatment,the effect of the usage ofconductive plastic drainage pipe and the optimum concentration are tests. It shows that:(1)conductive plastic drainagepipe can effectively solve the problem of metal electrode corrosion.(2)given the experiment,the soil strength can beenhanced homogeneously and the concentration of 1.5 mol/L can gain the biggest drainage amount and the higheststrength,which can offer a reference for the further research of electroosmotic chemical treatments.
The soft clay which is processed with vacuum preloading always needs to be secondarily processed tomeet the requirement of strength. However,as one of the important secondarily treatment,traditional electroosmoticchemical treatments suffer with the metal electrode corrosion and it is hard to be widely used. Based on these analyses,theelectroosmotic chemical treatment with different amount of solution CaCl_2 and Na_2SiO_3 is conducted and the injectionpipes are placed near the anode,the cathode and the center with the usage of new EKG in a self-developed injectiondevice. By monitoring drainage amount,electricity,potential and strength after treatment,the effect of the usage ofconductive plastic drainage pipe and the optimum concentration are tests. It shows that:(1)conductive plastic drainagepipe can effectively solve the problem of metal electrode corrosion.(2)given the experiment,the soil strength can beenhanced homogeneously and the concentration of 1.5 mol/L can gain the biggest drainage amount and the higheststrength,which can offer a reference for the further research of electroosmotic chemical treatments.
引文
[1]龚晓南,岑仰润.真空预压加固软土地基机理探讨[J].哈尔滨建筑大学学报,2002,35(2):7-10.
[2]孙立强,闫澍旺,李伟,等.超软土真空预压室内模型试验研究[J].岩土力学,2011(4):984-990.
[3]岑仰润,俞建霖,龚晓南.真空排水预压工程中真空度的现场测试与分析[J].岩土力学,2003(4):603-605.
[4]郭文章,王小林.电化学注浆加固法机理分析[J].西安矿业学院学报,1996,16(1):37-40.
[5]张慧,梧松.电化学方法加固超软土机理现场试验研究[J].建筑科学,2014,11:44-50.
[6]OU C Y,CHIEN S,WANG Y G.On the enhancement of electroosmotic soil improvement by injection of saline solutions[J].Applied Clay Science,2009,44(1-2):130-136.
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[8]曾国熙,高有潮.软粘土的电化学加固(初步试验结果)[J].浙江大学学报,1956(2):12-35.
[9]韩庆达,郭文章.电化学注浆法的初步研究[J].陕西煤炭技术,1991(2):29-32.
[10]刘根,王宁伟.注浆量对电化学加固影响的试验研究[C]//国家工业建构筑物质量安全监督检验中心、中国钢结构协会钢结构质量安全检测鉴定专业委员会.第四届全国工程结构安全检测鉴定与加固修复研讨会论文集.国家工业建构筑物质量安全监督检验中心、中国钢结构协会钢结构质量安全检测鉴定专业委员会,2015.
[11]韩舰辉,王宁伟,白小航,等.海相软黏土电化学改性固结试验研究[J].水利与建筑工程学报,2014,4:9-13,83.
[12]陶燕丽,周建,龚晓南,等.铁和铜电极对电渗效果影响的对比试验研究[J].岩土工程学报,2013(2):388-394.
[13]KALUMBA D,GLENDINNING S,ROGERS C D F,et al.Dewatering of tunneling slurry waste using electrokinetic geosynthetics[J].Journal of Environmental Engineering,2009,135(11):1227-1236.
[14]胡俞晨,王钊,庄艳峰.电动土工合成材料加固软土地基实验研究[J].岩土工程学报,2005,27(5):582-586.
[15]KANIRAJ S R,HUONG H L,YEE J H S.Electro-osmotic consolidation studies on peat and clayey silt using electric vertical drain[J].Geotechnical and Geological Engineering,2011,29(3):277-295.
[16]王协群,邹维列.电动土工合成材料的特性及应用[J].武汉理工大学学报,2002(6):62-65.
[17]李瑛,龚晓南,张雪婵.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.
[18]陈雄峰,荆一凤,吕鑑,等.电渗法对太湖环保疏浚底泥脱水干化研究[J].环境科学研究,2006,19(5):54-58.
[19]BEJRRUM L,MOUM J,EIDE O.Application of electro-osmosis to a foundation problem in Norwegian quick clay[J].Geotechnique,1967,17(3):214-235.
[20]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.
[2]孙立强,闫澍旺,李伟,等.超软土真空预压室内模型试验研究[J].岩土力学,2011(4):984-990.
[3]岑仰润,俞建霖,龚晓南.真空排水预压工程中真空度的现场测试与分析[J].岩土力学,2003(4):603-605.
[4]郭文章,王小林.电化学注浆加固法机理分析[J].西安矿业学院学报,1996,16(1):37-40.
[5]张慧,梧松.电化学方法加固超软土机理现场试验研究[J].建筑科学,2014,11:44-50.
[6]OU C Y,CHIEN S,WANG Y G.On the enhancement of electroosmotic soil improvement by injection of saline solutions[J].Applied Clay Science,2009,44(1-2):130-136.
[7]CHIEN S C,OU C Y,WANG Y K.Soil improvement using electroosmotic with the injection of chemical solutions:laboratory tests[J].Journal of the Chinese Institute of Engineers,2011,34(7):863-875.
[8]曾国熙,高有潮.软粘土的电化学加固(初步试验结果)[J].浙江大学学报,1956(2):12-35.
[9]韩庆达,郭文章.电化学注浆法的初步研究[J].陕西煤炭技术,1991(2):29-32.
[10]刘根,王宁伟.注浆量对电化学加固影响的试验研究[C]//国家工业建构筑物质量安全监督检验中心、中国钢结构协会钢结构质量安全检测鉴定专业委员会.第四届全国工程结构安全检测鉴定与加固修复研讨会论文集.国家工业建构筑物质量安全监督检验中心、中国钢结构协会钢结构质量安全检测鉴定专业委员会,2015.
[11]韩舰辉,王宁伟,白小航,等.海相软黏土电化学改性固结试验研究[J].水利与建筑工程学报,2014,4:9-13,83.
[12]陶燕丽,周建,龚晓南,等.铁和铜电极对电渗效果影响的对比试验研究[J].岩土工程学报,2013(2):388-394.
[13]KALUMBA D,GLENDINNING S,ROGERS C D F,et al.Dewatering of tunneling slurry waste using electrokinetic geosynthetics[J].Journal of Environmental Engineering,2009,135(11):1227-1236.
[14]胡俞晨,王钊,庄艳峰.电动土工合成材料加固软土地基实验研究[J].岩土工程学报,2005,27(5):582-586.
[15]KANIRAJ S R,HUONG H L,YEE J H S.Electro-osmotic consolidation studies on peat and clayey silt using electric vertical drain[J].Geotechnical and Geological Engineering,2011,29(3):277-295.
[16]王协群,邹维列.电动土工合成材料的特性及应用[J].武汉理工大学学报,2002(6):62-65.
[17]李瑛,龚晓南,张雪婵.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.
[18]陈雄峰,荆一凤,吕鑑,等.电渗法对太湖环保疏浚底泥脱水干化研究[J].环境科学研究,2006,19(5):54-58.
[19]BEJRRUM L,MOUM J,EIDE O.Application of electro-osmosis to a foundation problem in Norwegian quick clay[J].Geotechnique,1967,17(3):214-235.
[20]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.