离子土壤固化剂固化红黏土强度特性
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摘要
为研究液态离子型土壤固化剂加固红黏土的强度特性,采用美国Road Bond公司生产的液态离子型土壤固化剂对浙江金华地区的红黏土进行加固。在试验确定的最佳离子土壤固化剂掺量0.014%条件下,通过在试样土中加入不同掺量水泥、石灰,成型2种不同压实度(96%、98%)试件,分别进行固化土混合料的抗压回弹模量、抗压强度、劈裂强度和冻融强度试验,分析离子土壤固化剂加固红黏土的强度变化规律,并铺筑试验路进行验证。研究结果表明:红黏土中加入离子土壤固化剂后,其塑性指数有所降低,形成更为密实结构,固化剂、水泥或石灰的掺入都能增加混合料的抗压回弹模量,且在其他条件相同的情况下,掺入石灰对抗压回弹模量的增强效果优于水泥;各配合比混合料的7 d无侧限抗压强度受压实度影响较为显著,98%压实度固化效果优于96%压实度,固化剂、水泥、石灰的掺入均可较好提升试件的劈裂强度,随着水泥掺量的增加,其冻融抗压强度损失BDR也随之提高,其抗冻性能越好。结合现场试验路的情况,建议在实际工程中严格控制其压实度。
To study the strength performance of red soil treated by the liquid Ionic Soil Stabilizer, red soil obtained from the area of Jinhua in Zhejiang province was treated with the stabilizer produced by Road Bond Corporation of USA. Under conditions of optimal Ionic Soil Stabilizer contents, varying amounts of Portland cement or lime were added to the sample soil, molding specimens of two different compaction degrees(96%, 98%). Subsequently, different tests, such as, the resilient modulus test, compressive strength test, splitting strength test, and freeze-thaw strength test were conducted on the solidified soil mixture. Next, the varying intensities of the red soil reinforced by the Ionic Soil Stabilizer was analyzed and verified on a test road. The results show that after the addition of ionic soil-curing agent in the red soil, the plasticity index of the soil decreases to form a denser structure. Adding Ionic Soil Stabilizer along with cement or lime modifies the compressive modulus of resilience of the mixture. Under the same conditions, the compressive modulus of resilience increases in range when lime is added in a greater proportion than cement. The influence of the degree of compaction is significantly greater for the 7 d's unconfined compressive strength for mixtures of different ratios-98% versus 96%. Moreover, adding Ionic Soil Stabilizer, cement, or lime can also increase the splitting strength of the specimen. An increase in the content of cement increases the freeze-thaw damage BDR. The tests show that the compaction degree needs to be strictly controlled.
To study the strength performance of red soil treated by the liquid Ionic Soil Stabilizer, red soil obtained from the area of Jinhua in Zhejiang province was treated with the stabilizer produced by Road Bond Corporation of USA. Under conditions of optimal Ionic Soil Stabilizer contents, varying amounts of Portland cement or lime were added to the sample soil, molding specimens of two different compaction degrees(96%, 98%). Subsequently, different tests, such as, the resilient modulus test, compressive strength test, splitting strength test, and freeze-thaw strength test were conducted on the solidified soil mixture. Next, the varying intensities of the red soil reinforced by the Ionic Soil Stabilizer was analyzed and verified on a test road. The results show that after the addition of ionic soil-curing agent in the red soil, the plasticity index of the soil decreases to form a denser structure. Adding Ionic Soil Stabilizer along with cement or lime modifies the compressive modulus of resilience of the mixture. Under the same conditions, the compressive modulus of resilience increases in range when lime is added in a greater proportion than cement. The influence of the degree of compaction is significantly greater for the 7 d's unconfined compressive strength for mixtures of different ratios-98% versus 96%. Moreover, adding Ionic Soil Stabilizer, cement, or lime can also increase the splitting strength of the specimen. An increase in the content of cement increases the freeze-thaw damage BDR. The tests show that the compaction degree needs to be strictly controlled.
引文
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[2] 卢雪松.离子土壤固化剂加固武汉红色黏土的试验效果及其机理研究[D].武汉:中国地质大学,2010.LU Xue-song.Research on the Experimental Effect and Mechanism of Ionic Soil Stabilizer Reinforcing Wuhan Red Clay [D].Wuhan:China University of Geosciences,2010.
[3] 卢雪松,项伟,曹李靖.离子土壤固化剂加固红黏土的ξ电位试验研究[J].路基工程,2009(6):32-33.LU Xue-song,XIANG Wei,CAO Li-jing.Research on the ξ Potential of Ionic Soil Stabilizer Reinforcing Red Clay [J].Subgrade Engineering,2009 (6):32-33.
[4] 崔德山,项伟,JOACHIM Rohn.离子土固化剂加固红黏土的X射线衍射试验[J].长江科学院院报,2009,26(9):39-43.CUI De-shan,XIANG Wei,JOACHIM R.X Ray Diffraction Experiment of Ionic Soil Stabilizer Reinforcing Red Clay [J].Journal of Yangtze River Scientific Research Institute,2009,26 (9):39-43.
[5] 崔德山,项伟,董建军,等.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,2007,24(3):42-45.CUI De-shan,XIANG Wei,DONG Jian-jun,et al.Research on the Ionic Soil Stabilizer Reinforcing Red Clay [J].Journal of Yangtze River Scientific Research Institute,2007,24 (3):42-45.
[6] 汪益敏,贾娟,张丽娟,等.ISS加固土的微观结构及强度特征[J].华南理工大学学报:自然科学版,2002,30(9):96-99.WANG Yi-min,JIA Juan,ZHANH Li-juan,et al.Microstructure and Strength Characteristics of ISS Stabilized Soil [J].Journal of South China University of Technology:Natural Science Editon,2002,30 (9):96-99.
[7] 刘小丽,邓建辉,李广涛.滑带土强度特性研究现状[J].岩土力学,2004,25(11):1849-1854.LIU Xiao-li,DENG Jian-hui,LI Guang-tao.Research Status on Strength Properties of Slip Soils [J].Rock and Soil Mechanics,2004,25 (11):1849-1854.
[8] 王尚,张玉斌,卓建平.ISS离子稳固剂稳定土反应机理及其应用探讨[J].公路,2005(7):192-194 WANG Shang,ZHANG Yu-bin,ZHUO Jian-ping.Research on Reaction Mechanism,Application of Lonic Soil Stabilizer [J].Highway,2005 (7):192-194.
[9] 张丽娟,汪益敏,陈页开,等.电离子土壤固化剂加固土的压实性能[J].华南理工大学学报:自然科学版,2004,32(3):83-87.ZHANG Li-juan,WANG Yi-min,CHEN Ye-kai,et al.Compaction Capacity of ISS Stabilized Soil [J].Journal of South China University of Technology:Natural Science Edition,2004,32 (3):83-87.
[10] 王世梅,刘德富,陈勇,等.某滑坡滑带非饱和土强度特性试验研究[J].合肥工业大学学报:自然科学版,2005,28(12):1578-1581.WANG Shi-mei,LIU De-fu,CHEN Yong,et al.Research on the Strength Characteristic of Unsaturated Soils in a Landslide [J].Journal of Hefei University of Technology:Natural Science,2005,28 (12):1578-1581.
[11] 项伟,崔德山,刘莉.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,2007,32(3):397-402.XIANG Wei,CUI De-shan,LIU Li.Experimental Study on Sliding Soil of Ionic Soil Stabilizer [J].Earth Science — Journal of China University of Geosciences,2007,32 (3):397-402.
[12] PETRY T M,BRAJA D.Evaluation of Chemical Modifiers and Stabilizers for Chemically Active Soils-clays [J].Transportation Research Record,2001 (1757):43-49.
[13] KATZ L,RAUCH A,LILJESTRAND H,et al.Mechanisms of Soil Stabilization with Liquid Ionic Stabilizer [J].Transportation Research Record,2001 (1757):50-57.
[14] ARGU Y.Stabilization of Light Grey and Red Clay Subgrade Soil Using LS-40 Chemical and Lime [D].Addis Ababa:Addis Ababa University,2008.
[15] CHAWA P.Evaluation of Strength,Swell and Shrinkage Characteristics of Chemically Treated Soils from North Texas [D].Arlington:University of Texas at Arlington,2002.