纤维增韧地质聚合物改良膨胀土力学特性试验
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摘要
针对膨胀土对工程建设的危害,提出一种纤维加筋和化学改良相结合的技术,开展无侧限抗压强度试验,探讨固化剂类型和掺量、碱激发剂的掺入、玄武岩纤维掺量以及养护龄期对改良膨胀土无侧限抗压强度的影响。研究结果表明:双掺矿渣微粉-粉煤灰(GGBS-FA)的改良效果优于单掺,GGBS-FA的最优掺量为20%,并且掺入碱激发剂Na_2SiO_3的改良效果较好,碱激发GGBS-FA改良土的强度比GGBS-FA改良土的提高了107%;随着纤维掺量的增加,改良土的强度呈现先增大后减小的趋势,GGBS-FA改良土的纤维最优掺筋率为0.6%;改良土的强度随着养护龄期的延长逐渐提高。龄期越长,改良土的脆性越大,韧性越差。
Considering the expansive soil damage in the construction engineering, a technology based on fiber reinforcement and chemical modification was proposed. The unconfined compression tests were carried out to investigate the strength of expansive soil under different influencing factors of type and content of the solidifying agent, blending ratio of alkali activator and basalt fiber and curing time of the samples. Results showed that the mixing of ground granulated blast furnace slag(GGBS) and fly ash(FA) was better for the strength improvement of expansive soil. 20% of GGBS-FA mixture was the optimum blending ratio. Adding Na_2SiO_3 in GGBS-FA modified soil could further improve the strength, which was 107% higher than that of the soil without any alkali activator. The strength of the modified soil increased to the max and then decreased with the increase of fiber content. The optimum reinforcement content of GGBS-FA modified soil was 0.6%.The strength of the modified soil increased gradually with the curing time. The longer the age, the greater the brittleness and the worse toughness of the modified soil.
Considering the expansive soil damage in the construction engineering, a technology based on fiber reinforcement and chemical modification was proposed. The unconfined compression tests were carried out to investigate the strength of expansive soil under different influencing factors of type and content of the solidifying agent, blending ratio of alkali activator and basalt fiber and curing time of the samples. Results showed that the mixing of ground granulated blast furnace slag(GGBS) and fly ash(FA) was better for the strength improvement of expansive soil. 20% of GGBS-FA mixture was the optimum blending ratio. Adding Na_2SiO_3 in GGBS-FA modified soil could further improve the strength, which was 107% higher than that of the soil without any alkali activator. The strength of the modified soil increased to the max and then decreased with the increase of fiber content. The optimum reinforcement content of GGBS-FA modified soil was 0.6%.The strength of the modified soil increased gradually with the curing time. The longer the age, the greater the brittleness and the worse toughness of the modified soil.
引文
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[13] 孙树林,唐俊,郑青海,等.掺高炉水渣膨胀土的室内改良试验研究[J].岩土力学,2012,33(7):1940.
[14] 易耀林,李晨,孙川,等.碱激发矿粉固化连云港软土试验研究[J].岩石力学与工程学报,2013,32(9):1820.
[15] 黄萧.碱激发矿渣基地质聚合物固化铬渣的实验研究[D].重庆:重庆大学,2015.
[16] 徐洪钟,刘阳,孙义杰,等.基于BOTDA的土工格栅加筋膨胀土湿胀干缩特性试验[J].地下空间与工程学报,2016,12(4):1077.
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[18] RAMASUBBARAO G V.Strength behaviour of kerosene coated coir fiber-reinforced expansive soil[J].Facta Universitatis Series:Architecture and Civil Engineering,2014,12(2):113.
[2] 袁广林,田立柱.膨胀土对建筑物的危害及防治[J].煤矿设计,1999(4):30.
[3] 林玉山,凌泽民.膨胀土胀缩性评价中有关问题的研究[J].工程地质学报,1998,6(3):264.
[4] 黄锦鑫.弱膨胀土铁路路基工程病害的防治措施[J].科技情报开发与经济,2007,17(28):275.
[5] SHARMA A K,SIVAPULLAIAH P V.Fly ash and GGBS mixtures for geotechnical and geo-environmental applications[C]∥American Society of Civil Engineers Geo-Chicago 2016.Chicago:[s.n.],2016∶121.
[6] 李进.膨胀土改良的室内试验研究及地基胀缩变形分析[D].南京:河海大学,2006.
[7] 刘林,刘坤岩.膨胀土改良机理及改良剂对比试验研究[J].公路工程,2011,36(1):142.
[8] 刘海明,赵超,姚美良,等.膨胀土改良技术研究进展[J].低温建筑技术,2016,38(11):95.
[9] LIU Y Q,ZHU W P,YANG E H.Alkali-activated ground granulated blast-furnace slag incorporating incinerator fly ash as a potential binder[J].Construction and Building Materials,2016,112:1005.
[10] SAHU V,SRIVASTAVA A,MISRA A K,et al.Stabilization of fly ash and lime sludge composites:assessment of its performance as base course material[J].Archives of Civil and Mechanical Engineering,2017,17(3):475.
[11] 查甫生,王连斌,刘晶晶,等.高钙粉煤灰固化重金属污染土的工程性质试验研究[J].岩土力学,2016,37(增刊1):249.
[12] 查甫生,刘松玉,杜延军,等.石灰-粉煤灰改良膨胀土试验[J].东南大学学报(自然科学版),2007,37(2):339.
[13] 孙树林,唐俊,郑青海,等.掺高炉水渣膨胀土的室内改良试验研究[J].岩土力学,2012,33(7):1940.
[14] 易耀林,李晨,孙川,等.碱激发矿粉固化连云港软土试验研究[J].岩石力学与工程学报,2013,32(9):1820.
[15] 黄萧.碱激发矿渣基地质聚合物固化铬渣的实验研究[D].重庆:重庆大学,2015.
[16] 徐洪钟,刘阳,孙义杰,等.基于BOTDA的土工格栅加筋膨胀土湿胀干缩特性试验[J].地下空间与工程学报,2016,12(4):1077.
[17] SHARMA A K,SIVAPULLAIAH P V.Ground granulated blast furnace slag amended fly ash as an expansive soil stabilizer[J].Soils and Foundations,2016,56(2):205.
[18] RAMASUBBARAO G V.Strength behaviour of kerosene coated coir fiber-reinforced expansive soil[J].Facta Universitatis Series:Architecture and Civil Engineering,2014,12(2):113.