离子土固化剂固化淤泥的微观机理研究
|
摘要
采用离子土固化剂对武汉典型淤泥进行化学加固,通过阿太堡界限试验获得不同配合比加固土的塑性指数;对离子土固化淤泥前后的样品开展了压缩性能、微观结构、比表面积、化学成分、能谱分析和阳离子交换等试验,研究离子土固化剂对淤泥加固的宏观表现与微观作用机理。试验结果表明:经离子土固化剂处理后的淤泥压缩性减小,孔隙变小,离子土固化剂促使土颗粒之间聚集、凝结,团聚体明显增大,比表面积减小,比表面能降低,土体结构更致密。淤泥固化前后其化学成分并没有发生改变,离子土固化剂与淤泥胶体颗粒表面的反离子层发生了阳离子交换反应,固化剂稀释液中部分K+、Na+离子被淤泥土截获吸附,黏土颗粒表面的Ca2+、Mg2+离子被解析出,使扩散层厚度变薄,ξ电势降低,黏土胶体颗粒聚结,提高了土颗粒之间的联结强度和稳定性,从而达到土壤改性加固的目的。
The typical silt in Wuhan is solidified with Ionic Soil Stabilizer(ISS).The plasticity index of soil with different mix proportions is obtained through the test of Atterberg limits.The compressive properties,microstructure,specific surface area,chemical composition,energy spectrum analysis and cation exchange test are carried out before and after the solidification of silt with ISS.The macroscopic and microscopic mechanism of the solidification of silt with ISS are studied.The test results show that the compressive strength of silt treated with ISS decreases and porosity decreases.Ionic Soil Stabilizer promotes aggregation and condensation of soil particles,aggregates obviously increase,specific surface area decreases,specific surface energy decreases,and soil structure is denser.There is no change in the chemical composition of the silt before and after solidification.Cation exchange reaction occurs between the ISS and the counter ion layer on the surface of the silt colloid particles.The K+and Na+ions in the diluents of the curing agent are captured and adsorbed by the silt.The Ca2+and Mg2+ions on the surface of clay particles are resolved,which makes the thickness of the diffusion layer thinner,the ξ potential decreased,and the clay colloid particles coalesced.ISS improves the strength and stability of the soil particles,so as to achieve the purpose of soil modification and solidification.
The typical silt in Wuhan is solidified with Ionic Soil Stabilizer(ISS).The plasticity index of soil with different mix proportions is obtained through the test of Atterberg limits.The compressive properties,microstructure,specific surface area,chemical composition,energy spectrum analysis and cation exchange test are carried out before and after the solidification of silt with ISS.The macroscopic and microscopic mechanism of the solidification of silt with ISS are studied.The test results show that the compressive strength of silt treated with ISS decreases and porosity decreases.Ionic Soil Stabilizer promotes aggregation and condensation of soil particles,aggregates obviously increase,specific surface area decreases,specific surface energy decreases,and soil structure is denser.There is no change in the chemical composition of the silt before and after solidification.Cation exchange reaction occurs between the ISS and the counter ion layer on the surface of the silt colloid particles.The K+and Na+ions in the diluents of the curing agent are captured and adsorbed by the silt.The Ca2+and Mg2+ions on the surface of clay particles are resolved,which makes the thickness of the diffusion layer thinner,the ξ potential decreased,and the clay colloid particles coalesced.ISS improves the strength and stability of the soil particles,so as to achieve the purpose of soil modification and solidification.
引文
Cui D S,Xiang W,Dong J J,et al.2007.Experimental study on red clay reinforced with ionic soil stabilizer[J].Journal of Yangtze River Scientific Research Institute,24(3):42-45.
Katz L E,Rauch A F,Liljestrand H M,et al.2001.Mechanisms of soil stabilization with liquid ionic stabilizer[J].Journal of the Transportation Research Board,1757(1):50-57.
Lei W,Xiang W.2014.Mechanism of disturbed sliding zone soil improved by en-1 ionic soil stabilizer[J].Journal of Yangtze River Scientific Research Institute,31(5):47-51.
Liu Q B,Xiang W,Cui D S,et al.2011.Mechanism of expansive soil improved by ionic soil stabilizer[J].Chinese Journal of Geotechnical Engineering,33(4):648-654.
Liu Q B,Xiang W,Zhang W F,et al.2009.Experimental study of ionic soil stabilizer-improves expansive soil[J].Rock and Soil Mechanics,30(8):2286-2290.
Lu X S,Xiang W.2011.Experimental study on specific surface area of red clay strengthened by ISS[J].Yangtze River,42(1):83-86.
Shan Z J.2010.Mechanism study on the reinforcement of EN-1 ionic soil stabilizer to the loess slope[D].Yangling:Institute of Soil and Water Conservation,CAS&MWR.
Wang Y M,Liu X L,Chen Y K,et al.2009.Experiment of strengthening mechanism of swelling soil using ISS[J].Journal of Highway and Transportation Research and Development,26(10):6-10.
Wu X T,Xiang W,Zhang M X,et al.2016.Solidification of fluviatilelacustrine facies silt with ionic soil stabilizer[J].Electronic Journal of Geotechnical Engineering,21(5):2071-2082.
Xiang W,Cui D S,Liu L.2007.Experimental study on sliding soil of ionic soil stabilizer-reinforces[J].Earth Science-Journal of China University of Geosciences,32(3):397-402.
Yang Q,Luo X H,Qiu X,et al.2015.Analysis of microstructure characteristics and stabilization mechanism of ionic soil stabilizer treated clay[J].Journal of Highway and Transportation Research and Development,32(11):33-40.
Yao A L,Yan X L,Liang C Y,et al.1998.Research for road performance of ISS soil stabilizer[J].Journal of Xi'an Highway University,18(1):15-19.
Zhang M,He F,Zhao D Y,et al.2017.Transport of stabilized iron nanoparticles in porous media:Effects of surface and solution chemistry and role of adsorption[J].Journal of Hazardous Materials,322:284-291.
Zhao H H,Ge L,Petry T M,et al.2014.Effects of chemical stabilizers on an expansive clay[J].KSCE Journal of Civil Engineering,18(4):1009-1017.
Zhu W,Min F L,LüY Y,et al.2013.Subject of“mud science and application technology”and its research progress[J].Rock and Soil Mechanics,34(11):3041-3054.
崔德山,项伟,董建军,等.2007.离子土壤固化剂加固红黏土的试验研究[J].长江科学院院报,24(3):42-45.
单志杰.2010.EN-1离子固化剂加固黄土边坡机理研究[D].杨凌:中国科学院教育部水土保持与生态环境研究中心.
雷雯,项伟.2014.EN-1离子土壤固化剂对滑坡滑带土扰动样的改性机理研究[J].长江科学院院报,31(5):47-51.
刘清秉,项伟,崔德山,等.2011.离子土固化剂改良膨胀土的机理研究[J].岩土工程学报,33(4):648-654.
刘清秉,项伟,张伟锋,等.2009.离子土壤固化剂改性膨胀土的试验研究[J].岩土力学,30(8):2286-2290.
卢雪松,项伟.2011.离子土壤固化剂加固红色黏土的比表面积研究[J].人民长江,42(1):83-86.
汪益敏,刘小兰,陈页开,等.2009.离子型土固化材料对膨胀土的加固机理试验研究[J].公路交通科技,26(10):6-10.
项伟,崔德山,刘莉.2007.离子土固化剂加固滑坡滑带土的试验研究[J].地球科学-中国地质大学学报,32(3):397-402.
杨青,罗小花,邱欣,等.2015.离子土壤固化剂固化土的微观结构特征及固化机理研究[J].公路交通科技,32(11):33-40.
姚爱玲,延西利,梁春雨,等.1998.ISS土壤稳定剂路用性能的试验研究[J].西安公路交通大学学报,18(1):15-19.
朱伟,闵凡路,吕一彦,等.2013.“泥科学与应用技术”的提出及研究进展[J].岩土力学,34(11):3041-3054.
Katz L E,Rauch A F,Liljestrand H M,et al.2001.Mechanisms of soil stabilization with liquid ionic stabilizer[J].Journal of the Transportation Research Board,1757(1):50-57.
Lei W,Xiang W.2014.Mechanism of disturbed sliding zone soil improved by en-1 ionic soil stabilizer[J].Journal of Yangtze River Scientific Research Institute,31(5):47-51.
Liu Q B,Xiang W,Cui D S,et al.2011.Mechanism of expansive soil improved by ionic soil stabilizer[J].Chinese Journal of Geotechnical Engineering,33(4):648-654.
Liu Q B,Xiang W,Zhang W F,et al.2009.Experimental study of ionic soil stabilizer-improves expansive soil[J].Rock and Soil Mechanics,30(8):2286-2290.
Lu X S,Xiang W.2011.Experimental study on specific surface area of red clay strengthened by ISS[J].Yangtze River,42(1):83-86.
Shan Z J.2010.Mechanism study on the reinforcement of EN-1 ionic soil stabilizer to the loess slope[D].Yangling:Institute of Soil and Water Conservation,CAS&MWR.
Wang Y M,Liu X L,Chen Y K,et al.2009.Experiment of strengthening mechanism of swelling soil using ISS[J].Journal of Highway and Transportation Research and Development,26(10):6-10.
Wu X T,Xiang W,Zhang M X,et al.2016.Solidification of fluviatilelacustrine facies silt with ionic soil stabilizer[J].Electronic Journal of Geotechnical Engineering,21(5):2071-2082.
Xiang W,Cui D S,Liu L.2007.Experimental study on sliding soil of ionic soil stabilizer-reinforces[J].Earth Science-Journal of China University of Geosciences,32(3):397-402.
Yang Q,Luo X H,Qiu X,et al.2015.Analysis of microstructure characteristics and stabilization mechanism of ionic soil stabilizer treated clay[J].Journal of Highway and Transportation Research and Development,32(11):33-40.
Yao A L,Yan X L,Liang C Y,et al.1998.Research for road performance of ISS soil stabilizer[J].Journal of Xi'an Highway University,18(1):15-19.
Zhang M,He F,Zhao D Y,et al.2017.Transport of stabilized iron nanoparticles in porous media:Effects of surface and solution chemistry and role of adsorption[J].Journal of Hazardous Materials,322:284-291.
Zhao H H,Ge L,Petry T M,et al.2014.Effects of chemical stabilizers on an expansive clay[J].KSCE Journal of Civil Engineering,18(4):1009-1017.
Zhu W,Min F L,LüY Y,et al.2013.Subject of“mud science and application technology”and its research progress[J].Rock and Soil Mechanics,34(11):3041-3054.
崔德山,项伟,董建军,等.2007.离子土壤固化剂加固红黏土的试验研究[J].长江科学院院报,24(3):42-45.
单志杰.2010.EN-1离子固化剂加固黄土边坡机理研究[D].杨凌:中国科学院教育部水土保持与生态环境研究中心.
雷雯,项伟.2014.EN-1离子土壤固化剂对滑坡滑带土扰动样的改性机理研究[J].长江科学院院报,31(5):47-51.
刘清秉,项伟,崔德山,等.2011.离子土固化剂改良膨胀土的机理研究[J].岩土工程学报,33(4):648-654.
刘清秉,项伟,张伟锋,等.2009.离子土壤固化剂改性膨胀土的试验研究[J].岩土力学,30(8):2286-2290.
卢雪松,项伟.2011.离子土壤固化剂加固红色黏土的比表面积研究[J].人民长江,42(1):83-86.
汪益敏,刘小兰,陈页开,等.2009.离子型土固化材料对膨胀土的加固机理试验研究[J].公路交通科技,26(10):6-10.
项伟,崔德山,刘莉.2007.离子土固化剂加固滑坡滑带土的试验研究[J].地球科学-中国地质大学学报,32(3):397-402.
杨青,罗小花,邱欣,等.2015.离子土壤固化剂固化土的微观结构特征及固化机理研究[J].公路交通科技,32(11):33-40.
姚爱玲,延西利,梁春雨,等.1998.ISS土壤稳定剂路用性能的试验研究[J].西安公路交通大学学报,18(1):15-19.
朱伟,闵凡路,吕一彦,等.2013.“泥科学与应用技术”的提出及研究进展[J].岩土力学,34(11):3041-3054.