摘要
铁锰夹层是桂东南风化花岗岩稳定性的重要影响因素。利用扫描电镜(SEM)、高分辨率CT、X射线粉末衍射分析(XRD)、差热-热重分析(DSC-TG)、X射线光电子能谱技术(XPS)等测试手段,对花岗岩中铁锰夹层的微观结构及组成进行了研究。铁锰夹层土体颗粒根据风化程度不同,表现出球形、不规则块状、片状等形态;铁锰夹层光滑面内孔隙较小以孤立孔为主,连通孔主要分布于铁锰夹层与全风化土过渡层中,样品总体大孔隙占比超过90%;铁锰夹层主要组成元素为:O、Si、Al、Fe、Mn、C等元素,并且Fe、Mn元素明显高于同地区全风化土,Fe、Mn含量比接近1∶2,在夹层中分别以+3、+4价的较高价态存在;铁锰夹层主要成分为:高岭石、石英、水钠锰矿、水铁矿、针铁矿。
The iron manganese interlayer in weathered granite in southeastern Guangxi is an important factor affecting its stability.The microstructure and material composition of black iron manganese interlayers in weathered granite in southeastern Guangxi were studied using testing methods such as SEM,high-resolution CT,XRD,DSC TG,XPS,etc.The soil particles of iron manganese interlayer exhibit different shapes,spherical,irregular,and sheet-like depending on the degree of weathering.The smooth surface of the iron manganese interlayer has smaller pores,mainly isolated pores,and connected pores are mainly distributed in the transition layer between the iron manganese interlayer and completely weathered soil.The macropores in the sample exceeds 90%;The main components of the iron manganese interlayer are O,Si,Al,Fe,Mn,C,of which the Fe and Mn elements are significantly higher than those of the completely weathered soil in the same area.The Fe and Mn content ratio in the iron manganese interlayer is close to 1∶2,and there are higher valence states of+3 and+4 in the interlayer,respectively.The main components of iron manganese interlayer are:kaolinite,quartz,boehmite,hematite,goethite.
作者
于江涛
王晨
王志兵
YU Jiangtao;WANG Chen;WANG Zhibing(School of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Geotechnical Mechanics and Engineering,Guilin University of Technology,Guilin 541004,Guangxi)
出处
《洛阳理工学院学报（自然科学版）》
2024年第1期14-20,34,共8页
Journal of Luoyang Institute of Science and Technology：Natural Science Edition
基金
国家自然科学基金项目(42167021)
广西自然科学基金项目(2021GXNSFAA196028)。
关键词
铁锰夹层
花岗岩风化土
微观结构
物质组成
边坡稳定性
iron manganese interlayer
granite weathered soil
microstructure
material composition
slope stability
