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黄棕色砒砂岩微结构特征及崩散微观特征研究

葛 磊，卢垟杰，曹婷婷
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2021年 第40卷 第2期: 1000-6281（2021）02-126-06     下载地址：

黄棕色砒砂岩微结构特征及崩散微观特征研究

葛  磊，卢垟杰，曹婷婷

（1.陕西地建土地工程技术研究院有限责任公司，陕西西安710075；2.陕西省土地工程建设集团有限责任公司，陕西西安710075；3.自然资源部退化及未利用土地整治工程重点实验室，陕西西安710075；4.陕西省土地整治工程技术研究中心，陕西西安710075）

摘  要 利用扫描电镜/能谱仪对榆林地区黄棕色砒砂岩的微观结构特征以及崩散微观特征进行观察研究，发现黄棕色砒砂岩具有三种胶结类型不同，胶结程度不一的典型结构面，其孔隙类型丰富，孔隙连通性较好，胶结物质以粘土矿物和方解石为主要组成。粘土矿物以水敏性的蒙脱石组矿物为主，蒙脱石形态主要以片状、丝片状和棉絮状为主，以孔隙衬垫和孔隙充填的形式赋存。而导致砒砂岩遇水崩散的关键原因在于砒砂岩中松散的微观结构、以钙质胶结物和蒙皂石、伊蒙混层及伊利石等水敏性矿物为主要胶结物的胶结特性。

关键词 扫描电镜；砒砂岩；微观结构特征；崩散特征

中图分类号：S152.1  文献标识码：Ａ   doi:10.3969/j.issn.1000-6281.2021.02.005

 

Study on microstructure characteristics and disintegration microscopic characteristics of yellow-brown arsenic sandstone

GE Lei1，2，3，4，LU Yang-jie1，2，3，4，CAO Ting-ting1，2，3，4

(1. Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi'an Shaanxi 710075；2. Shaanxi Provincial Land Engineering Construction Group Co., Ltd,. Xi'an Shaanxi 710075；3. Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of NatrualResources, Xi'an Shaanxi 710075, China; 4. Shaanxi Provincial Land Consolidation Engineering Technology Research Center，Xi'an Shaanxi 710075, China)

Abstract: Scanning electron microscopy/energy spectrometer was used to observe and study the microscopic structure and disintegration microscopic characteristics of the yellow-brown arsenic sandstone in Yulin area. It was found that the yellow-brown arsenic sandstone has three kinds of typical structural planes with different cementation types and different degrees of cementation. The pore type is rich, the pore connectivity is good, and the cemented material is composed mainly of clay minerals and calcite. The clay minerals are mainly water-sensitive montmorillonite group minerals. The montmorillonite morphology is mainly composed of flakes, silk flakes and cotton wool, which are endowed in the form of pore liner and pore filling. The key causes of arsenic collapsing when encountering water are the loose microstructure of the Soft Rocks, and the cementation characteristics of the water-sensitive minerals such as calcium cement and smectite, yummy mixed layer and illite..

Keywords  scanning electron microscopy；arsenic sandstone；microstructural characteristics；collapse characteristics

 

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