全风化混合花岗岩矿物成分与微观结构研究
摘要:运用扫描电镜研究不同含水率的风化混合花岗岩微观结构，通过X射线粉晶衍射获得其矿物成分分布，取得了以下新进展：岩样的矿物成分主要为石英、长石、蒙脱石、伊利石和高岭石，石英、长石的平均的含量分别为28.09%、44.26%，黏土矿物中亲水性较强的蒙脱石占比最高，为19.79%；试样显微结构以粗颗粒石英、长石为骨架，以叠片状和碎粒状黏土矿物为充填物形成较为密实的骨架–充填结构；通过对试样的颗粒形态和孔隙分布数据统计分析发现随着含水率升高，细砂粒含量不断增加且颗粒的排列趋于混乱无序，孔隙整体含量及贯通率呈上升趋势，中大孔含量显著增加；由于亲水性黏土矿物吸水诱发膨胀势，导致原始充填结构遭到破坏，密实程度大幅度降低。
Abstract:The microstructure of completely decomposed migmatitic granite (CDMG) with different water contents was studied using scanning electron microscopy, and its mineral composition distribution was obtained through X-ray powder diffraction. The results show that the mineral compositions of CDMG are mainly quartz, feldspar, montmorillonite, illite and kaolinite, with the average content of quartz and feldspar being 28.09% and 44.26% respectively. In the clay minerals, montmorillonite with strong hydrophilicity accounts for the highest proportion of 19.79%. The microstructure of the sample is composed of coarse-grained quartz and feldspar as the skeleton, and laminated and crushed clay minerals as the filling material to form a dense skeleton-filling structure. Through the statistical analysis of the particle morphology and pore distribution data of the sample, it is found that with the increase of moisture content, the content of fine sand keeps increasing and the arrangement of particles tends to be chaotic. The pore content and transfixion rate increased, and the content of the macropore increased significantly. The original filling structure was destroyed and the degree of compactness was greatly reduced due to the expansion potential induced by water absorption of hydrophilic clay minerals.
中文标题：
全风化混合花岗岩矿物成分与微观结构研究
Mineral Composition and Microstructure of Completely Decomposed Migmatitic Granite
作者：
王晖1,,严松2, 3,,
Wang Hui1,,Yan Song2, 3,,
作者简介:王 晖，男，1977年生，汉族，高级工程师，主要从事公路管理方面研究。E-mail：1433710531@qq.com通讯作者:严 松，男，1994年生，硕士研究生，主要从事特殊土工程性质的研究。E-mail： songYan_whrsm@163.com
通讯地址：
1.云南交通运输综合行政执法局质监支队，云南昆明 650214 2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北武汉 430071 3.中国科学院大学，北京 100049
1.QualitySupervisionDetachmentofYunnanTransportationComprehensiveAdministrativeLawEnforcementBureau,Kunming650214,Yunnan,China 2.StateKeyLaboratoryofGeomechanicsandGeotechnicalEngineering,InstituteofRockandSoilMechanics,ChineseAcademyofSciences,Wuhan,430071,Hubei,China 3.UniversityofChineseAcademyofSciences,Beijing100049,China
中图分类号:TU 458
doi:10.3969/j.issn.1007-2993.2023.06.012
出版物：岩土工程技术
收稿日期:2022-09-23
修回日期:2023-04-11
录用日期:2023-07-14
刊出日期:2023-12-08
关键词:全风化混合花岗岩,矿物成分,微观结构,颗粒,孔隙
Key words:completely decomposed migmatitic granite,mineral composition,microstructure,particles,pore
文档包含图片数量：图片(14)张
文档包含表格数量：表格(2)个
参考文献：
[1]KIM C,KIM T. Behavior of unsaturated weathered residual granite soil with initial water contents[J]. Engineering Geology,2010,113(1):1-10.
[2]ZENG L,BIAN H,SHI Z,et al. Forming condition of transient saturated zone and its distribution in residual slope under rainfall conditions[J]. Journal of Central South University,2017,24(8):1866-1880. doi: 10.1007/s11771-017-3594-6
[3]王 清,唐大雄,张庆云,等. 中国东部花岗岩残积土物质成分和结构特征的研究[J]. 长春地质学院学报,1991,(1):73-81.
[4]吴能森. 结构性花岗岩残积土的特性及工程问题研究[D]. 南京: 南京林业大学, 2005.
[5]GUTIERREZ N H M,NÓBREGA M T,VILAR O M. Influence of the microstructure in the collapse of a residual clayey tropical soil[J]. Bulletin of Engineering Geology and the Environment,2009,68(1):107-116. doi: 10.1007/s10064-008-0180-z
[6]陈秋南,李建新,赵磊军. 南岳地区花岗岩残积土微观特性研究[J]. 地下空间与工程学报,2015,11(S1):119-123.
[7]KONG L,SAYEM H M,TIAN H. Influence of drying-wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T2) relaxometry[J]. Canadian Geotechnical Journal,2018,55(2):208-216. doi: 10.1139/cgj-2016-0614
[8]SUN Y,TABG L. Use of X-ray computed tomography to study structures and particle contacts of granite residual soil[J]. Journal of Central South University,2019,26(4):938-954. doi: 10.1007/s11771-019-4062-2
[9]安 然,孔令伟,黎澄生,等. 炎热多雨气候下花岗岩残积土的强度衰减与微结构损伤规律[J]. 岩石力学与工程学报,2020,39(9):1902-1911.
[10]GB/T 50123—2019 土工试验方法标准[S]. 北京: 中国建筑工业出版社, 2019.
[11]ZHANG N,FU J. Experimental study on quantification of clay minerals via X-ray diffraction apparatus[J]. Oil Exploration and Development,1980,6:12-20.
[12]JULINA M,THYAGARAJ T. Quantification of desiccation cracks using X-ray tomography for tracing shrinkage path of compacted expansive soil[J]. Acta Geotechnica,2019,14(1):35-56. doi: 10.1007/s11440-018-0647-4
[13]安爱军,廖靖云. 基于核磁共振和扫描电镜的蒙内铁路膨胀土改良细观结构研究[J]. 岩土工程学报,2018,40(S2):152-156.
[14]尚彦军,吴宏伟,曲永新. 花岗岩风化程度的化学指标及微观特征对比−以香港九龙地区为例[J]. 地质科学,2001,(3):279-294.
[15]尚彦军,王思敬,岳中琦,等. 全风化花岗岩孔径分布–颗粒组成–矿物成分变化特征及指标相关性分析[J]. 岩土力学,2004,(10):1545-1550. doi: 10.3969/j.issn.1000-7598.2004.10.007
[16]黄 凌. 一次冻融黏土力学特性及微观孔隙特性试验研究[D]. 徐州: 中国矿业大学, 2016.
[17]HATTAB M,FLEUREAU J M. Experimental study of kaolin particle orientation mechanism[J]. Géotechnique,2010,60(5):323-331.
[18]袁志辉. 干湿循环下黄土的强度及微结构变化机理研究[D]. 西安: 长安大学, 2015.
[19]潘网生. 黄土优先流渗流特性及斜坡优势滑动面研究[D]. 西安: 长安大学, 2015.
基金项目：
基金项目:降雨和工程扰动诱发风化混合花岗岩边坡失稳力学机制和灾害调控技术研究（云交科教[2018]45号）
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