红黏土置换作用对水泥固化泥炭土强度的影响
|
摘要
针对红黏土置换后的泥炭土进行了水泥加固试验,并从宏观和微观两个角度对其固化机理展开了分析.研究表明:在含水率一定的条件下,固化泥炭土的无侧限抗压强度随红黏土置换率的提高呈先增大后减小的趋势;红黏土的置换作用一方面能够使其颗粒作为骨架填充固化土体的孔隙,另一方面在减少土体有机质含量的同时增加了Al元素含量,激发水化反应的活性并促进了钙矾石的生成.红黏土置换作用能够使泥炭土的絮状结构变得密实,颗粒连接和孔隙填充得到优化.
The red clay was applied to replace the peaty soil at a certain percentage, and the test study on the stabilized peaty soil was carried out with cement. The stabilized mechanism was discussed from macroscopical and microscopical aspects. The results show that the unconfined compressive strength of stabilized peaty soil increases firstly and then decreases with the increase of the replacement rate of red clay when the moisture content is the same.On the one hand, the replacement of red clay enables the particles to fill the soil pores as skeleton. On the other hand, the red clay reduces the organic matter content in the peaty soil and increases the Al content in the stabilized system simultaneously, which excites the activity of hydration and promotes the formation of ettringite. This can make the flocculent structure of peaty soil dense,the particles cementation and the pores filling optimized.
The red clay was applied to replace the peaty soil at a certain percentage, and the test study on the stabilized peaty soil was carried out with cement. The stabilized mechanism was discussed from macroscopical and microscopical aspects. The results show that the unconfined compressive strength of stabilized peaty soil increases firstly and then decreases with the increase of the replacement rate of red clay when the moisture content is the same.On the one hand, the replacement of red clay enables the particles to fill the soil pores as skeleton. On the other hand, the red clay reduces the organic matter content in the peaty soil and increases the Al content in the stabilized system simultaneously, which excites the activity of hydration and promotes the formation of ettringite. This can make the flocculent structure of peaty soil dense,the particles cementation and the pores filling optimized.
引文
[1] 蒋忠信.滇池泥炭土[M].成都:西南交通大学出版社,1994:32-55.JIANG Zhongxin.Dianchi peaty soil[M].Chengdu:Southwest Jiaotong University Press,1994:32-55.(in Chinese)
[2] 王志良,瞿嘉安,申林方,等.泥炭质土层盾构施工扰动引起隧道长期沉降的研究[J].岩土工程学报,2017,39(8):1416-1424.WANG Zhiliang,QU Jiaan,SHEN Linfang,et al.Long-term settlement of tunnel caused by shield tunneling in peaty soil[J].Chinese Journal of Geotechnical Engineering,2017,39(8):1416-1424.(in Chinese)
[3] KUMADA K.Chemistry of soil organic matter[M].Tokyo:Japan Scientific Societies Press,1987:20-32.
[4] TREMBLAY H,DUCHESNE J,LOCAT J,et al.Influence of the nature of organic compounds on fine soil stabilization with cement[J].Canadian Geotechnical Journal,2002,39(3):535-546.
[5] 王娟娣.水泥搅拌桩在泥炭土地基中的工程应用[C]//第四届浙江省岩土力学与工程学术讨论会.上海:上海交通大学出版社,1999:388-391.WANG Juandi.Engineering application of cement mixing pile in peaty soil foundation[C]//The 4th Symposium on Rock and Soil Mechanics and Engineering in Zhejiang Province.Shanghai:Shanghai Jiaotong University Press,1999:388-391.(in Chinese)
[6] 荀勇.有机质含量对水泥土强度的影响与对策[J].四川建筑科学研究,2000,26(3):58-60.XUN Yong.The anti-influences and influences of containing organic matter on cement soil strength[J].Building Science Research of Sichuan,2000,26(3):58-60.(in Chinese)
[7] 阮永芬,刘岳东,王东,等.昆明泥炭与泥炭质土对建筑地基的影响[J].昆明理工大学学报(理工版),2003,28(3):121-124.RUAN Yongfen,LIU Yuedong,WANG Dong,et al.Effect of Kunming's peat & peaty soil on the building foundation[J].Journal of Kunming University of Science and Technology(Science and Technology),2003,28(3):121-124.(in Chinese)
[8] 应建敏.含有机质软弱地基中水泥搅拌桩的应用[J].浙江建筑,1997(2):14-16.YING Jianmin.Application of cement mixing pile in soft soil foundation with organic matter[J].Zhejiang Construction,1997(2):14-16.(in Chinese)
[9] NIKOOKAR M,PASHAKI M K,NIKOOKAR H,et al.The geotechnical improvement of Talesh peat soil with cement[C]//The 3rd International Conference on New Developments in Soil Mechanics and Geotechnical Engineering.Nicosia:Near East University,2012:471-477.
[10] KALANTARI B,HUATB B K.Peat soil stabilization,using ordinary Portland cement,polypropylene fibers,and air curing technique[J].Electronic Journal of Geotechnical Engineering,2008,13:1-13.
[11] 梅益生.既有道路下软土地基深层处治的一种新方法——高压旋喷桩在泥炭质软土层(俗称草煤土)中的成桩方法和应用[J].岩土工程界,2009,12(4):30-33.MEI Yisheng.A new method for deep treatment of soft soil foundation under existing road-pile forming method and application of high pressure jet grouting pile in the peaty soft soil(commonly known as caomei soil)[J].Geotechnical Engineering World,2009,12(4):30-33.(in Chinese)
[12] CHEN H,WANG Q.The behaviour of organic matter in the process of soft soil stabilization using cement[J].Bulletin of Engineering Geology and the Environment,2006,65(4):445-448.
[13] ZHANG D,LIU Z,SUN X,et al.Laboratory tests on enhancing strength of cement stabilized organicsoil with addition of phosphor gypsum and calcium almninate cement[J].Journal of Southeast University,2017,33(3):301-308.
[14] HUATB B K,MAAIL S,MOHAMED T A.Effect of chemical admixtures on the engineering properties oftropical peat soils[J].American Journal of Applied Sciences,2005,2(7):1113-1120.
[15] GORZALSKI A S,DONLEY C,CORONELL O.Elemental composition of membrane foulant layers using EDS,XPS,and RBS[J].Journal of Membrane Science,2017,522:31-44.
[16] HASSAN W H W,RASHID A S A,LATIFI N,et al.Strength and morphological characteristics of organic soil stabilized with magnesium chloride[J].Quarterly Journal of Engineering Geology and Hydrogeology,2017,50(4):454-459.
[17] MOAYEDI H,NAZIR R,KAZEMIAN S,et al.Microstructure analysis of electrokinetically stabilized peat[J].Measurement,2014,48(1):187-194.
[18] KANG G,TSUCHIDA T,KIM Y S,et al.Influence of humic acid on the strength behavior of cement-treated clay during various curing stages[J].Journal of Materials in Civil Engineering,2017,29(8):04017057.
[19] 宁建国,黄新.固化土结构形成及强度增长机理试验[J].北京航空航天大学学报,2006,32(1):97-102.NING Jianguo,HUANG Xin.Experiment on structural formation and mechanism of strength increasing of stabilized soil[J].Journal of Beijing University of Aeronautics and Astronautics,2006,32(1):97-102.(in Chinese)
[20] ZULKIFLEY M T M,NG T F,RAJ J K,et al.A review of the stabilization of tropical lowland peats[J].Bulletin of Engineering Geology and the Environment,2014,73(3):733-746.
[21] DENG M,TANG M.Formation and expansion of ettringite crystals[J].Cement and Concrete Research,1994,24(1):119-126.
[22] HEBIB S,FARRELL E R.Some experiences on the stabilization of Irish peats[J].Canadian Geotechnical Journal,2003,40(1):107-120.
[23] LATIFI N,MEEHAN C L,MAJID M Z A,et al.Strengthening montmorillonitic and kaolinitic clays using a calcium-based non-traditional additive:A micro-level study[J].Applied Clay Science,2016,132-133:182-193.
[2] 王志良,瞿嘉安,申林方,等.泥炭质土层盾构施工扰动引起隧道长期沉降的研究[J].岩土工程学报,2017,39(8):1416-1424.WANG Zhiliang,QU Jiaan,SHEN Linfang,et al.Long-term settlement of tunnel caused by shield tunneling in peaty soil[J].Chinese Journal of Geotechnical Engineering,2017,39(8):1416-1424.(in Chinese)
[3] KUMADA K.Chemistry of soil organic matter[M].Tokyo:Japan Scientific Societies Press,1987:20-32.
[4] TREMBLAY H,DUCHESNE J,LOCAT J,et al.Influence of the nature of organic compounds on fine soil stabilization with cement[J].Canadian Geotechnical Journal,2002,39(3):535-546.
[5] 王娟娣.水泥搅拌桩在泥炭土地基中的工程应用[C]//第四届浙江省岩土力学与工程学术讨论会.上海:上海交通大学出版社,1999:388-391.WANG Juandi.Engineering application of cement mixing pile in peaty soil foundation[C]//The 4th Symposium on Rock and Soil Mechanics and Engineering in Zhejiang Province.Shanghai:Shanghai Jiaotong University Press,1999:388-391.(in Chinese)
[6] 荀勇.有机质含量对水泥土强度的影响与对策[J].四川建筑科学研究,2000,26(3):58-60.XUN Yong.The anti-influences and influences of containing organic matter on cement soil strength[J].Building Science Research of Sichuan,2000,26(3):58-60.(in Chinese)
[7] 阮永芬,刘岳东,王东,等.昆明泥炭与泥炭质土对建筑地基的影响[J].昆明理工大学学报(理工版),2003,28(3):121-124.RUAN Yongfen,LIU Yuedong,WANG Dong,et al.Effect of Kunming's peat & peaty soil on the building foundation[J].Journal of Kunming University of Science and Technology(Science and Technology),2003,28(3):121-124.(in Chinese)
[8] 应建敏.含有机质软弱地基中水泥搅拌桩的应用[J].浙江建筑,1997(2):14-16.YING Jianmin.Application of cement mixing pile in soft soil foundation with organic matter[J].Zhejiang Construction,1997(2):14-16.(in Chinese)
[9] NIKOOKAR M,PASHAKI M K,NIKOOKAR H,et al.The geotechnical improvement of Talesh peat soil with cement[C]//The 3rd International Conference on New Developments in Soil Mechanics and Geotechnical Engineering.Nicosia:Near East University,2012:471-477.
[10] KALANTARI B,HUATB B K.Peat soil stabilization,using ordinary Portland cement,polypropylene fibers,and air curing technique[J].Electronic Journal of Geotechnical Engineering,2008,13:1-13.
[11] 梅益生.既有道路下软土地基深层处治的一种新方法——高压旋喷桩在泥炭质软土层(俗称草煤土)中的成桩方法和应用[J].岩土工程界,2009,12(4):30-33.MEI Yisheng.A new method for deep treatment of soft soil foundation under existing road-pile forming method and application of high pressure jet grouting pile in the peaty soft soil(commonly known as caomei soil)[J].Geotechnical Engineering World,2009,12(4):30-33.(in Chinese)
[12] CHEN H,WANG Q.The behaviour of organic matter in the process of soft soil stabilization using cement[J].Bulletin of Engineering Geology and the Environment,2006,65(4):445-448.
[13] ZHANG D,LIU Z,SUN X,et al.Laboratory tests on enhancing strength of cement stabilized organicsoil with addition of phosphor gypsum and calcium almninate cement[J].Journal of Southeast University,2017,33(3):301-308.
[14] HUATB B K,MAAIL S,MOHAMED T A.Effect of chemical admixtures on the engineering properties oftropical peat soils[J].American Journal of Applied Sciences,2005,2(7):1113-1120.
[15] GORZALSKI A S,DONLEY C,CORONELL O.Elemental composition of membrane foulant layers using EDS,XPS,and RBS[J].Journal of Membrane Science,2017,522:31-44.
[16] HASSAN W H W,RASHID A S A,LATIFI N,et al.Strength and morphological characteristics of organic soil stabilized with magnesium chloride[J].Quarterly Journal of Engineering Geology and Hydrogeology,2017,50(4):454-459.
[17] MOAYEDI H,NAZIR R,KAZEMIAN S,et al.Microstructure analysis of electrokinetically stabilized peat[J].Measurement,2014,48(1):187-194.
[18] KANG G,TSUCHIDA T,KIM Y S,et al.Influence of humic acid on the strength behavior of cement-treated clay during various curing stages[J].Journal of Materials in Civil Engineering,2017,29(8):04017057.
[19] 宁建国,黄新.固化土结构形成及强度增长机理试验[J].北京航空航天大学学报,2006,32(1):97-102.NING Jianguo,HUANG Xin.Experiment on structural formation and mechanism of strength increasing of stabilized soil[J].Journal of Beijing University of Aeronautics and Astronautics,2006,32(1):97-102.(in Chinese)
[20] ZULKIFLEY M T M,NG T F,RAJ J K,et al.A review of the stabilization of tropical lowland peats[J].Bulletin of Engineering Geology and the Environment,2014,73(3):733-746.
[21] DENG M,TANG M.Formation and expansion of ettringite crystals[J].Cement and Concrete Research,1994,24(1):119-126.
[22] HEBIB S,FARRELL E R.Some experiences on the stabilization of Irish peats[J].Canadian Geotechnical Journal,2003,40(1):107-120.
[23] LATIFI N,MEEHAN C L,MAJID M Z A,et al.Strengthening montmorillonitic and kaolinitic clays using a calcium-based non-traditional additive:A micro-level study[J].Applied Clay Science,2016,132-133:182-193.