基于IPP图像处理的膨胀土微观结构定量研究
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摘要
利用环境扫描电镜(ESEM)获取不同浸水时间下合肥膨胀土的微观结构扫描图像,基于专业图像处理软件ImagePro Plus(IPP)对膨胀土的ESEM图像进行处理和分析,研究了不同浸水时间下合肥膨胀土的表观孔隙比、分形维数和大小组成情况。研究表明,膨胀土的表观孔隙比随着浸水时间的增大逐渐增大,其增长速率逐渐减小。运用小岛法对土样的颗粒和孔隙的分形维数进行研究,结果表明,膨胀土的颗粒和孔隙均具有明显的分形特征,分形维数在1.1～1.3之间。随着浸水时间的逐渐增大,颗粒的分形维数在减小,孔隙的分形维数在增大,二者呈现相反的变化趋势。对土样的颗粒和孔隙按照大(> 5μm)、中(2～5μm)、小(1～2μm)、微(<1μm) 4组进行分类,分析了不同浸水时间下各类颗粒和孔隙占比的演变趋势。
The scanning electron microscope(ESEM) is used to obtain the scanning image of the microstructure of expansive soil under different soaking times.Based on the professional image processing software Image-Pro Plus(IPP),the ESEM images of the expansive soil are processed and analyzed.The apparent pore ratio,fractal dimension and composition of expansive soil under different soaking times are studied.The results show that the apparent pore ratio of the expansive soil increases gradually with the increasing soaking time,and its growth rate decreases gradually.The small island method is used to study the particle size and pore size of soil samples.The results indicate that the particles and pore of the expansive soil have obvious fractal characteristics,and the fractal dimension ranges from 1.1 to 1.3.With the gradual increase of the soaking time,the fractal dimension of the particles decreases,and the fractal dimension of the pores increases,and the two trend are opposite.The soil particles and the pore are classified as four groups of large(> 5 μm),medium(2-5 μm),small(1-2 μm) and micro(< 1 μm).Evolution of various types of particles and pores under different soaking times are also analyzed.
The scanning electron microscope(ESEM) is used to obtain the scanning image of the microstructure of expansive soil under different soaking times.Based on the professional image processing software Image-Pro Plus(IPP),the ESEM images of the expansive soil are processed and analyzed.The apparent pore ratio,fractal dimension and composition of expansive soil under different soaking times are studied.The results show that the apparent pore ratio of the expansive soil increases gradually with the increasing soaking time,and its growth rate decreases gradually.The small island method is used to study the particle size and pore size of soil samples.The results indicate that the particles and pore of the expansive soil have obvious fractal characteristics,and the fractal dimension ranges from 1.1 to 1.3.With the gradual increase of the soaking time,the fractal dimension of the particles decreases,and the fractal dimension of the pores increases,and the two trend are opposite.The soil particles and the pore are classified as four groups of large(> 5 μm),medium(2-5 μm),small(1-2 μm) and micro(< 1 μm).Evolution of various types of particles and pores under different soaking times are also analyzed.
引文
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[2]廖世文.膨胀土与铁路工程[M].北京:中国铁道出版社,1984.[LIAO S W.Expansive soil and railway engineering[M].Beijing:China Railway Publishing House,1984.(in Chinese)]
[3]刘特洪.工程建设中的膨胀土问题[M].北京:中国建筑工业出版社,1997.[LIU T H.Problems related to expansive soil in engineering constructions[M].Beijing:China Architecture and Building Press,1997.(in Chinese)]
[4]谭晓慧,辛志宇,沈梦芬,等.湿胀条件下合肥膨胀土土-水特征研究[J].岩土力学,2014,35(12):3352-3360.[TAN X H,XIN Z Y,SHEN M F,et al.Study of soil-water characteristics of Hefei expansive soil under moisture-expansion condition[J].Rock and Soil Mechanics,2014,35(12):3352-3360.(in Chinese)]
[5]谢舒雷,朱大勇,侯超群,等.干湿循环作用对合肥膨胀土的影响[J].合肥工业大学学报(自然科学版),2017,40(3):368-372.[XIE S L,ZHU D Y,HOU C Q,et al.Test on the influence of dryingwetting cycles on expansive soil in Hefei[J].Journal of Hefei University of Technology(Natural Science),2017,40(3):368-372.(in Chinese)]
[6]谭罗荣,张梅英,邵梧敏.灾害性膨胀土的微结构特征及其工程性质[J].岩土工程学报,1994,16(2):48-57.[TAN L R,ZHANG M Y,SHAO W M,et al.Microstructure characteristics and engineering properties of expansive soil[J].Chinese Journal of Geotechnical Engineering,1994,16(2):48-57.(in Chinese)]
[7]施斌,姜洪涛.黏性土的微观结构分析技术研究[J].岩石力学与工程学报,2001,20(6):864-870.[SHI B,JIANG H T.Research on the analysis techniques for clayey soil microstructure[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(6):864-870.(in Chinese)]
[8]张季如,黄丽,祝杰.微观尺度上土壤孔隙及其分维数的SEM分析[J].土壤学,2008(2):207-215.[ZHANG J R,HUANG L,ZHU J,et al.Sem analysis of soil pore and its fractal dimension on microscale[J].Acta Pedologic Sinia,2008(2):207-215.(in Chinese)]
[9]王宝军,施斌,蔡奕.基于GIS的黏性土SEM图像三维可视化与孔隙度计算[J].岩土力学,2008,29(1):251-255.[WANG B J,SHI B,CAI Y,et al.3D visualization and porosity computation of clay soil SEM image by GIS[J].Rock and Soil Mechanics,2008,29(1):251-255.(in Chinese)]
[10]高可可,逄焕平,孙志彬,等.合肥膨胀土颗粒分形特性研究[J].合肥工业大学学报(自然科学版),2018,41(8):1665-1669.[GAO K K,PANG H P,SUN Z B,et al.Study on fractal dimension of expansive soil in Hefei[J].Journal of Hefei University of Technology(Natural Science),2018,41(8):1665-1669.(in Chinese)]
[11]袁则循,毛灵涛,赵丹.基于数字地形模型土微结构三维孔隙度的计算方法[J].辽宁工程技术大学学报(自然科学版),2011,30(5):734-737.[YUANZ X,MAO L T,ZHAO D.Computation method on 3Dporosity of soil microstructure based on digital terrain model[J].Journal of Liaoning Technical University(Natural Science),2011,30(5):734-737.(in Chinese)]
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