宣城网纹红土成分与微结构的定量研究

发布时间：2019-07-26 10:39

【摘要】：网纹红土红色基质和白色网纹的成分和结构差异性影响并控制着工程特性。文章通过扫描电子显微镜(scanning electron microscope,SEM)实验和数字图像处理技术定量研究原状网纹红土的微孔隙特征,进而基于能量色散谱仪(energy dispersive spectrometer,EDS)和X射线衍射仪(X-ray diffractometer,XRD)分析了红色基质和白色网纹的化学成分和黏土矿物构成,以探讨网纹红土微结构和成分与其力学特征的内在联系。研究得出,网纹红土孔隙主要为小于0.5μm2面积的微孔隙,而面积超过50μm2的大孔隙则较少,但红色基质颗粒表面粗糙、棱角分明,主要由绿泥石/蒙脱石混层和伊利石以及少量的绿泥石和高岭石构成,而白色网纹颗粒则较为圆滑,由伊利石/蒙脱石混层和伊利石构成,且红色基质中Fe元素质量分数高于白色网纹,而两者中的Ti元素质量分数稳定。研究结果可为深入分析网纹红土工程特征提供依据。
[Abstract]:The composition and structure difference of red matrix and white mesh of reticulated red soil affect and control the engineering characteristics. In this paper, the micropore characteristics of reticulated red soil were quantitatively studied by scanning electron microscope (scanning electron microscope,SEM) experiment and digital image processing technique. The chemical composition and clay mineral composition of red matrix and white reticulated red soil were analyzed based on energy dispersive spectrometer (energy dispersive spectrometer,EDS) and X-ray diffractometer (X-ray diffractometer,XRD), in order to explore the internal relationship between microstructure and composition of reticulated laterite and its mechanical characteristics. It is found that the pores of reticulated laterite are mainly micropores with an area of less than 0.5 渭 m ~ 2, while those with an area of more than 50 渭 m ~ 2 are less, but the surface of red matrix particles is rough and angular, which is mainly composed of chlorite / montmorillonite mixed layer and Illite, as well as a small amount of chlorite and kaolinite, while the white reticulated particles are smooth and composed of Illite / montmorillonite mixed layer and Illite. The mass fraction of Fe in red matrix was higher than that in white mesh, but the mass fraction of Ti in red matrix was stable. The research results can provide a basis for further analysis of the engineering characteristics of reticulated red soil.
【作者单位】：合肥工业大学土木与水利工程学院;
【基金】：国家自然科学基金资助项目(41172274;71273081) 安徽省大学生创新创业训练计划资助项目(2015CXCYS086) 合肥工业大学大学生创新创业训练计划资助项目(2014CXCY289)
【分类号】：TU446

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