增湿条件下泾阳南塬马兰黄土孔隙率变化研究
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摘要
研究泾阳南塬原状马兰黄土孔隙率在增湿前后的变化特征,为黄土湿陷机理孔隙参数的确定提供一种依据。利用影像分析软件对扫描电子显微镜下获得的泾阳南塬原状马兰黄土增湿前后同一位置的微观影像进行二值化处理,并对马兰黄土中的不同类型的孔隙进行统计、对比、分析。结果表明增湿后架空结构破坏导致的大孔隙减少是马兰黄土发生湿陷的主要原因,并且这种湿陷会在下次孔隙变化时再次体现。将影像分析软件和电镜扫描技术相结合能够快速的分析黄土微观结构并获得相关孔隙参数。
Study the variation characteristics of porosities of undisturbed Malan loess of the south Jingyang plateau before and after humidification can provide a basis for the pore parameters of loess collapsibility mechanism. The Image-Pro Plus(IPP) was used to binarize the microscopic images of the undisturbed loess samples that taken from the same positions, and the statistics, comparison and analysis of pores were made at the same time. The results showed that the decrease of macro pores after humidification is the main reason for collapsibility of Malan loess, and this collapsibility will be reflected again during the next humidification and dehumidification process. The incorporation of IPP and scanning electron microscope technology can quickly analyze loess microstructure and obtain relevant pore parameters, which provide great convenience for using to establish collapsible model.
Study the variation characteristics of porosities of undisturbed Malan loess of the south Jingyang plateau before and after humidification can provide a basis for the pore parameters of loess collapsibility mechanism. The Image-Pro Plus(IPP) was used to binarize the microscopic images of the undisturbed loess samples that taken from the same positions, and the statistics, comparison and analysis of pores were made at the same time. The results showed that the decrease of macro pores after humidification is the main reason for collapsibility of Malan loess, and this collapsibility will be reflected again during the next humidification and dehumidification process. The incorporation of IPP and scanning electron microscope technology can quickly analyze loess microstructure and obtain relevant pore parameters, which provide great convenience for using to establish collapsible model.
引文
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[21] 潘网生.黄土优先流渗流特性及斜坡优势滑动面研究[D].西安:长安大学, 2015.
[2] 王家鼎,惠泱河.黄土地区灌溉水诱发滑坡群的研究[J].地理科学,2002,22(3):305-310.
[3] Karl T. Theoretical Soil Mechanics[M].New York,USA:John Wiley and Sons,1943.
[4] Arya A L, Samson N, Ian S. Loess as a collapsible soil: Some basic particle packing aspects[J].Quaternary International,2018,469(Part A):20-29.
[5] 郭泽泽,李喜安,陈阳,等.基于SEM-EDS的湿陷性黄土黏土矿物定量分析[J].工程地质学报,2016,24(5):899-906.
[6] Laing B. Consolidation of compacted and unsaturated clays[J].Géotechnique,1965,15(3):267-286.
[7] Laing B, McGown A, Collins K. The collapse mechanism in partly saturated soil[J].Engineering Geology,1973,7(1):49-60.
[8] Dudley J H. Review of collapsing soils[J].Journal of Soil Mechanics & Foundations Div,1970,97(3):925-947.
[9] 高国瑞.黄土湿陷变形的结构理论[J].岩土工程学报,1990,12(4):1-10.
[10] 高国瑞.中国黄土的微结构[J].科学通报,1980,25(20):945-948.
[11] 高国瑞.黄土显微结构分类与湿陷性[J].中国科学,1980,23(12):1203-1208,1237-1240.
[12] 雷祥义.中国黄土的孔隙类型与湿陷性[J].中国科学(B辑化学生物学农学医学地学),1987,17(12):1309-1318.
[13] 雷祥义.西安黄土显微结构类型[J].西北大学学报(自然科学版),1983, (4):56-65,127-132.
[14] 王永焱,滕志宏.中国黄土的地层划分[J].地质论评,1983,29(3):201-208.
[15] 张苏民,张炜.减湿和增湿时黄土的湿陷性[J].岩土工程学报,1992(1):57-61.
[16] 陈存礼,高鹏,胡再强.黄土的增湿变形特性及其与结构性的关系[J].岩石力学与工程学报,2006,25(7):1352-1360.
[17] Chen Z H, Fredlund D G, Gan J K. Overall volume change, water volume change, and yield associated with an unsaturated compacted loess[J].Canadian Geotechnical Journal,2011,36(2):321-329.
[18] 陕西省地质矿产局.陕西省区域地质志[M].北京:地质出版社,1989:546-552.
[19] 雷祥义.我国黄土的孔隙分类和工程性质[C]. 成都:全国第三次工程地质大会论文选集,1988:15-23.
[20] 张晓周,卢婷,卢玉东,等.泾阳南塬马兰黄土多尺度下的孔隙特征[J].水土保持通报,2018,38(3):212-216.
[21] 潘网生.黄土优先流渗流特性及斜坡优势滑动面研究[D].西安:长安大学, 2015.