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| 合徐高速公路南段膨胀土矿物成分及微结构 | |
| 引用本文： | 柏立懂,崔可锐,胡文奎.合徐高速公路南段膨胀土矿物成分及微结构[J].水文地质工程地质,2005,32(4):13-16. |
| 作者姓名： | 柏立懂 崔可锐 胡文奎 |
| 作者单位： | 1. 上海岩土工程勘察设计研究院有限公司,上海,200002;合肥工业大学资源与环境工程学院,合肥,230009 2. 合肥工业大学资源与环境工程学院,合肥,230009 3. 济南市勘察测绘研究院,济南,250013 |
| 摘 要： | 运用X—射线衍射、偏光显微镜、扫描电镜以及化学全量分析等方法,对合徐高速公路南段膨胀土的矿物组分及微结构等方面进行较为深入的研究,探明其特殊的工程性质不仅与膨胀土的矿物组分、阳离子交换量有关,更与其微结构密切相关,特别是其结构联结特征;膨胀土的胀缩特性随着粘土矿物含量的增大,特别是蒙脱石、阳离子交换量能力的增强而增强;土的微结构是控制膨胀土胀缩性的另一个重要因素,随着粘土基质中的卷曲片状物质的增多而增强,而膨胀土的物理力学性质很大程度上取决于膨胀土粘土颗粒之间的结合连接程度。 |
| 关 键 词： | 膨胀土 胀缩性 微结构 矿物成分 合徐高速公路南段 |
| 文章编号： | 1000-3665(2005)04-0013-04 |
| 修稿时间： | 2004年10月21 |
Mineral composition and microstructure of expansive soil in south part of Hefei-Xuzhou Expressway |
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| BAI Li-dong,CUI Ke-rui,HU Wen-kui.Mineral composition and microstructure of expansive soil in south part of Hefei-Xuzhou Expressway[J].Hydrogeology and Engineering Geology,2005,32(4):13-16. | |
| Authors: | BAI Li-dong CUI Ke-rui HU Wen-kui |
| Institution: | BAI Li-dong 1,CUI Ke-rui 1,HU Wen-kui 2 |
| Abstract: | The mineral composition and microstructure of expansive soil in south part of Hefei-Xuzhou Expressway are studied mainly by X-ray Diffraction Analysis (XDA), Partial Microscope, Scanning Electron Microscope (SEM) and Chemistry Analysis in this paper. Study shows that the engineering property of expansive soil is mainly controlled by not only its mineral composition and capability of exchangeable cation (CEC) but also more microstructure and even its characteristics of structural combining, at the same time, the microstructure also plays a very important role in its distensibility and shrinkage and mechanics property, etc. The distensibility and shrinkage potential of expansive soil becomes stronger with the increase of clay mineral content, the capability of exchangeable cation (CEC) and the crinkle flake grain content, and the mechanics property of expansive soil lies on the combining degree between clay grains. |
| Keywords: | expansive soil distensibility and shrinkage microstructure mineral composition south part of He-Xu Expressway |
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