郭泽泽, 李喜安, 陈阳, 骆建文, 洪勃, 王力. 2016: 基于SEM-EDS的湿陷性黄土黏土矿物定量分析. 工程地质学报, 24(5): 899-906. DOI: 10.13544/j.cnki.jeg.2016.05.020
    引用本文: 郭泽泽, 李喜安, 陈阳, 骆建文, 洪勃, 王力. 2016: 基于SEM-EDS的湿陷性黄土黏土矿物定量分析. 工程地质学报, 24(5): 899-906. DOI: 10.13544/j.cnki.jeg.2016.05.020
    GUO Zeze, LI Xi'an, CHEN Yang, LUO Jianwen, HONG Bo, WANG Li. 2016: ANALYSIS OF CLAY MINERALS IN COLLAPSIBLE LOESS WITH SEM-EDS. JOURNAL OF ENGINEERING GEOLOGY, 24(5): 899-906. DOI: 10.13544/j.cnki.jeg.2016.05.020
    Citation: GUO Zeze, LI Xi'an, CHEN Yang, LUO Jianwen, HONG Bo, WANG Li. 2016: ANALYSIS OF CLAY MINERALS IN COLLAPSIBLE LOESS WITH SEM-EDS. JOURNAL OF ENGINEERING GEOLOGY, 24(5): 899-906. DOI: 10.13544/j.cnki.jeg.2016.05.020

    基于SEM-EDS的湿陷性黄土黏土矿物定量分析

    ANALYSIS OF CLAY MINERALS IN COLLAPSIBLE LOESS WITH SEM-EDS

    • 摘要: 黄土在压力作用下受水浸湿后,其特有的孔隙体系内颗粒间胶结作用的丧失而导致颗粒发生相对滑动所产生的变形是黄土发生湿陷的根本原因,而黄土中的胶结物以附于碎屑颗粒或团聚体等骨架颗粒表面的黏土矿物为主。黄土中有多种黏土矿物,由于各种黏土矿物的水理性质不同,对黄土湿陷性的影响亦各有不同,因此在某种程度上黏土矿物成分及其所占比例能够反映黄土的湿陷性。本文通过对延安地区不同深度黄土中的主要矿物元素进行能谱分析,建立了质量守恒方程组。把该方程组问题转化为最优化问题——线性规划标准形问题,采用数学规划问题中的单纯形法来计算矿物构成,分析了延安地区黄土中主要黏土矿物的含量,结合化学分析测试结果对该方法的可行性进行了探讨。结果表明:本方法计算精度满足要求,是一种行之有效的测定黄土中黏土矿物含量的途径,该方法最大的优势在于数据获取便捷,可实现SEM环境下的即时定点定量分析。

       

      Abstract: The main reason of the occurrence of collapsibility of loess under pressure soaked by water is the loss of the cementation within its specific pore system, which leading to the deformation caused by the relative sliding among practices. The main cement in loess is the clay minerals attaching to the surface of the skeletal debris particles. There are a variety of clay minerals in loess. Due to their different hydraulic properties, the impact on the collapsible loess are also different. So the composition and its proportion of clay mineral, to some extent, can reflect the collapsibility of loess. Based on the spectrum analysis of main mineral elements at different depths in Yan'an, element mass conservation equations have been directly obtained. Then it is converted into an optimization problem. The main clay mineral contents of the loess are calculated by the means of simplex evolutionary method of standard linear programming. Moreover, a feasibility study of the method is carried out by comparing the calculating results with chemistry analysis result. The results show that the method meets request of precision and is proved to be an effective way of measuring clay mineral contents of loess. The acquisition of data is convenient and the quantitative analysis at fixed point under SEM platform can be realized.

       

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