| 考虑非饱和特性的黄土湿陷性与微观结构分析 |
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| 引用本文： | 马富丽,白晓红,王梅,杨晶,韩鹏举.考虑非饱和特性的黄土湿陷性与微观结构分析[J].地震学刊,2012(5):636-642. |
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| 作者姓名： | 马富丽 白晓红 王梅 杨晶 韩鹏举 |
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| 作者单位： | [1]太原理工大学建筑与土木工程学院,太原030024 [2]太原理工大学矿业工程学院,太原030024 [3]太原电力高等专科学校土木工程系,太原030013 |
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| 基金项目： | 国家自然科学基金项目（51178287）; 山西省自然科学基金项目（2010011029）; 山西省回国留学人员科研项目（2011-026）资助 |
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| 摘 要： | 利用扫描电子显微镜测试技术对3个场地16个土样的微观结构进行观测,并使用图像处理软件对微观图像进行处理、对土样孔隙的几何特征参数和分维数进行了提取,土样孔隙分布分维数为1.816~1.936。利用分形几何学原理建立非饱和土的孔隙分布函数,对天然湿度下黄土中水分分布进行分析,运用回归分析的方法对孔隙的分维数、非饱和孔隙孔隙率和湿陷性的关系进行了分析。结果表明：孔隙分维数越大,孔隙结构越复杂;天然湿度下处于非饱和状态的黄土孔隙孔径均大于40μm,黄土的湿陷系数随着孔隙分维数、非饱和孔隙孔隙率的增大而增大,非饱和孔隙是造成黄土湿陷的主要原因。
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| 关 键 词： | 非饱和土 湿陷性黄土 微观结构 分形 实验研究 |
Analysis of Collapsibility and Microstructure of Loess considering Unsaturated Characteristics |
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| MA Fu-li,BAI Xiao-hong,WANG Mei,YANG Jing,HAN Peng-ju.Analysis of Collapsibility and Microstructure of Loess considering Unsaturated Characteristics[J].Journal of Seismology,2012(5):636-642. |
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| Authors: | MA Fu-li BAI Xiao-hong WANG Mei YANG Jing HAN Peng-ju |
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| Institution: | 1. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 3. Department of Civil Engineering, Taiyuan Institute of Electrical Engineering, Taiyuan 030013, China) |
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| Abstract: | This paper analyzes the microstructure of 16 groups of soil sample from three different sites. Pictures of microstructure were processed with imaging processing program to acquire the geometric characteristic parameter and fractal dimension of pores. The range of pores＇ fractal dimension is 1. 816--1. 936. The pore distribution function of unsaturated soil was established based on fractal geometry. The moisture distribution of loess under natural moisture was analyzed. The relationships of collapsibility coefficient with fraetal dimension and porosity of unsaturated pores were analyzed with the method of regression analysis. A larger fractal dimension represents a more complex pore-structure. The collapsibility coefficient of loess increases with the increase of fractal dimension and porosity of unsaturated pores. Unsaturated pore is the main cause to form collapsibility of loess. |
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| Keywords: | unsaturated soil loess with collapsibility microstructure fractal experimental study |
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