基于标准差椭圆法SEM图像颗粒定向研究原理与方法
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摘要
土体的结构特性研究是土力学和土质学研究的前沿课题,而关于土颗粒定向特性的定量研究方法相对较少,某些方法由于需要过多的人为判断而缺乏客观性。引入ArcGIS中用于点集分布特征的分析方法——标准差椭圆法,通过微观结构图像的转换和处理,利用标准差椭圆给出图像中所有颗粒的定向角分布,进而计算土样的主定向角和各向异性率。该方法为颗粒定向的定量研究提供了一个科学、客观和可靠的手段。
Studies on soil microstructure are the front edge of the subject on soil mechanics and soil properties.However,the quantitative studies on the orientation characteristics of soil grains in the soil microstructural images(SEM) are an intractable subject in the past decades.An analytical method called the standard deviational ellipse method,which is often used for point set distribution analysis in geographical information system(GIS),is introduced for quantitative analysis of soil grains.Through the conversion and processing of soil microstructural images,the orientation angles of soil grains’ can be fast determined by using the standard deviational ellipse method,and the correlative data can be statistically analyzed,and then the characteristic of the soil grain orientation distribution can be obtained.The results show that the method is more scientific,objective and reliable for the quantitative studies on soil grain orientation distribution.
Studies on soil microstructure are the front edge of the subject on soil mechanics and soil properties.However,the quantitative studies on the orientation characteristics of soil grains in the soil microstructural images(SEM) are an intractable subject in the past decades.An analytical method called the standard deviational ellipse method,which is often used for point set distribution analysis in geographical information system(GIS),is introduced for quantitative analysis of soil grains.Through the conversion and processing of soil microstructural images,the orientation angles of soil grains’ can be fast determined by using the standard deviational ellipse method,and the correlative data can be statistically analyzed,and then the characteristic of the soil grain orientation distribution can be obtained.The results show that the method is more scientific,objective and reliable for the quantitative studies on soil grain orientation distribution.
引文
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[4]王清,王凤艳,肖树芳.土微观结构特征的定量研究及其在工程中的应用[J].成都理工学院学报,2001,28(2):148–153.(WANG Qing,WANG Feng-yan,XIAO Shu-fang.A quantitative study of the microstructure characteristics of soil and its application to engineering[J].Journal of Chendu University of Technology,2001,28(2):148–153.(in Chinese))
[5]施斌,姜洪涛.粘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 Bin,JIANG Hong-tao.Research on the analysis techniques for clayey soil microstructure[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(6):864–870.(in Chinese))
[6]施斌.粘性土微观结构简易定量分析法[J].水文地质工程地质,1997,24(1):7–10.(SHI Bin.A simplified quantitative analysis method for soil microstructure[J].1997,24(1):7–10.(in Chinese))
[7]WELTY Lefever D.Measuring geographic concentration by means of the stand deviational ellipse[J].The American Journal of Sociology,1926(1):88–94.
[8]YUILL Robert S.The standard deviational ellipse;an updated tool for spatial description[J].Geografiska Annaler(Series B).Human Geography,1971,53(1):28–39.
[9]BASHUR Rashid L,SHANON Gary W,FLORY Stanley E,et al.Community interaction and racial integration in the Detroit area:an ecological analysis[R].US Office of Education,1967.
[10]BASHUR Rashid L,SHANNON Gary W,METZNER Charles A.The Application of three-dimensional analogue models to the distribution of medical care facilities[C]//Paper Presented to the 97th Annual Meeting of the American Public Health Association,Philadelphia,1969.
[11]姜云鹏.在ArcGIS 9中进行空间统计[J].中国通讯,2006,19:1–9.(JIANG Yun-peng.Spatial statistic in ArcGIS9.0[J].Chinese Communication,2006,19:1–9.(in Chinese))
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