流化床燃煤固硫灰固化淤泥质土路用性能研究
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摘要
淤泥质软土通常难以满足路基工程填料要求.为利用淤泥质土和工业固体废弃物,采用流化床燃煤固硫灰固化淤泥质软土,通过标准击实试验、强度试验、水稳性试验,结果表明:掺加固硫灰使击实淤泥质土最佳含水量提高,最大干密度降低;固硫灰固化淤泥质土能提高淤泥质土的强度,符合路基填土要求;固硫灰最佳掺量为20%较合适,继续增大固硫灰掺量,所产生的强度增加幅度不明显,同时,在固硫灰中掺加适量石灰,强度可大幅提高;固硫灰能显著改善淤泥质土的水稳定性,这与固硫灰形成水硬性胶凝材料有关;固硫灰固化淤泥质土的微观形貌表明存在明显的火山灰反应.
Muddy soft soil is usually difficult to meet the requirement of the filler in subgrade engineering.In order to utilize muddy soil and industrial solid waste,fluidized bed combustion ashes was used to cure muddy soil.Standard compaction test,strength test and water stability test were done,the results showed that:the addition of fluidized bed combustion ashes can increase the optimum water content of the compacted muddy soil and decrease its maximum dry density;the muddy soil increases its strength and can be used as a kind of subgrade material by mixing fluidized bed combustion ashes;the optimum content of fluidized bed combustion ashes is about 20%,however,the strength of cured muddy soil would not be obviously improved even if the dosage of fluidized bed combustion ashes should continue to increase,furthermore,the strength of the cured muddy soil can be greatly increased with adding a proper proportion of lime;fluidized bed combustion ashes can significantly improve the water stability of muddy soil,which attributed to the formation of hydraulic binder;the pozzolanic reaction was proved by SEM analysis.
Muddy soft soil is usually difficult to meet the requirement of the filler in subgrade engineering.In order to utilize muddy soil and industrial solid waste,fluidized bed combustion ashes was used to cure muddy soil.Standard compaction test,strength test and water stability test were done,the results showed that:the addition of fluidized bed combustion ashes can increase the optimum water content of the compacted muddy soil and decrease its maximum dry density;the muddy soil increases its strength and can be used as a kind of subgrade material by mixing fluidized bed combustion ashes;the optimum content of fluidized bed combustion ashes is about 20%,however,the strength of cured muddy soil would not be obviously improved even if the dosage of fluidized bed combustion ashes should continue to increase,furthermore,the strength of the cured muddy soil can be greatly increased with adding a proper proportion of lime;fluidized bed combustion ashes can significantly improve the water stability of muddy soil,which attributed to the formation of hydraulic binder;the pozzolanic reaction was proved by SEM analysis.
引文
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[14] 宋远明.流化床燃煤固硫灰渣水化研究[D].重庆:重庆大学,2007:1-46 Song Yuanming.Study on hydration of fluidized bed combustion ashes[D].Chongqing:Chongqing University,2007:1-46
[2] Studds P,Miller Zo? M.Sustainable material reuse solutions for dredged sediments[J].International Journal of Sustainable Engineering,2010,3(1):33-39
[3] 郭印.淤泥质土的固化及力学特性的研究[D].杭州:浙江大学,2007 Guo Yin.Study on Stabilization of Muddy Soil and Mechanical Properties of Stabilized Soil[D].Hangzhou:Zhejiang University,2007
[4] 陈一新,王保田,张永奇,等.石灰改良淤泥质土的试验研究[J].科学技术与工程,2014,14(34):273-276 Chen Yixin,Wang Baotian,Zhang Yongqi,et al.Experimental study on lime improved mucky soil[J].Science Technology and Engineering,2014,14(34):273-276
[5] Feng Taowei,Lee Jiayih,Lee Yi-Jiuan.Consolidation behavior of a soft mud treated with small cemented content[J].Engineering Geology,2001,59(3/4):327-335
[6] 汤怡新,刘汉龙,朱伟.水泥固化土工程特性试验研究[J].岩土工程学报,2000,22(5):549-554 Tang Yixin,Liu Hanlong,Zhu Wei.Study on engineering properties of cement-stabilized soil[J].Chinese Journal of Geotechnical Engineering,2000,22(5):449-554
[7] Osula D O A.A comparative evaluation of cement and lime modification of laterite[J].Engineering Geology,1996,42(1):71-81
[8] Sezer A,Inan G,Yilmaz H R,et al.Utilization of a very high lime fly ash for improvement of Izmir clay [J].Building and Environment,2006,41(2):150-155
[9] Harichane K,Ghrici M,Kenai S,et al.Use of natural pozzolana and lime for stabilization of cohesive soils[J].Geotechnical and Geological Engineering,2011,29(5):759-769
[10] 丁建文,张帅,洪振舜,等.水泥-磷石膏双掺固化处理高含水率疏浚淤泥试验研究[J].岩土力学,2010,31(9):2817-2822 Ding Jianwen,Zhang Shuai,Hong Zhenshun,et al.Experimental study of solidification of dredged clays with high water content by adding cement and phosphogypsum synchronously[J].Rock and Soil Mechanics,2010,31(9):2817-2822
[11] 张大捷,田晓峰,侯浩波,等.矿渣胶凝材料固化软土的力学性状及机制[J].岩土力学,2007,28(9):1987-1991 Zhang Dajie,Tian Xiaofeng,Hou Haobo,et al.Mechanical behavior and mechanism of stabilizing soft soil by slag cementitious material[J].Rock and Soil Mechanics,2007,28(9):1987-1991
[12] 张丽华,范昭平.石灰-粉煤灰改良高含水率疏浚淤泥的试验[J].南京工业大学学报(自然科学版),2013,35(1):91-95 Zhang Lihua,Fan Zhaopin.Experimental study on lime-fly ash improving high water content dredged material[J].Journal of Nanjing University of Technology(Natural Science Edition),2013,35(1):91-95
[13] 宋远明,柴俊青,陈菲.流化床燃煤固硫灰渣体积稳定性及影响因素研究[J].粉煤灰,2010,(1):3-4 Song Yuanming,Chai Junqing,Chen Fei.Study on volume stability of FBC ash and its influencing factors[J].Coal Ash China,2010,(1):3-4
[14] 宋远明.流化床燃煤固硫灰渣水化研究[D].重庆:重庆大学,2007:1-46 Song Yuanming.Study on hydration of fluidized bed combustion ashes[D].Chongqing:Chongqing University,2007:1-46