必须声明标量变量 "@Script_ID"。 桂东南花岗岩风化土与残余节理的微观结构及演化-《地球科学与环境学报》
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 WANG Zhi-bing,ZOU Yong-sheng,LI Bin,et al.Micro-structure and Evolution of Relict Joints and Weathered Granite Soils in the Southeastern Guangxi, China[J].Journal of Earth Sciences and Environment,2020,42(03):405-415.[doi:10.19814/j.jese.2019.10040]





Micro-structure and Evolution of Relict Joints and Weathered Granite Soils in the Southeastern Guangxi, China
(1. 桂林理工大学 广西岩土力学与工程重点实验室,广西 桂林 541004; 2. 桂林理工大学 土木与建筑工程学院,广西 桂林 541004; 3. 中交天津港湾工程研究院有限公司,天津 300222)
WANG Zhi-bing12 ZOU Yong-sheng2 LI Bin3 TAN Bo2 HAN Xue2
(1. Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. College of Civil Engineering and Architecture,Guilin University of Technology, Guilin 541004, Guangxi, China; 3. Tianjin Port Engineering Institute Company Ltd. of CCCC First Harbor Engineering Company Ltd., Tianjin 300222, China)
风化花岗岩 残积土 残余节理 铁锰氧化物 微观结构 演化过程 滑坡 广西
weathered granite residual soil relict joint Fe-Mn oxide micro-structure evolution process landslide Guangxi
花岗岩残余节理是指花岗岩高度风化土体内的节理,常常被铁锰氧化物充填,呈褐黑色或黑色薄夹层,对边坡稳定性有重要影响。选取广西东南部容县陈村风化花岗岩滑坡内残余节理土及其两侧土体(全风化土)和上覆残积土为研究对象,分别研究这3种土样的矿物成分、化学成分、微观结构、孔隙分布特征,并探讨残余节理的演化过程及其对边坡稳定性的影响。结果表明:组成花岗岩全风化土和残积土的主要黏土矿物为高岭石、石英及少量伊利石。其中,全风化土内高岭石单晶尺寸在数微米至数十微米,呈书本状构造; 残积土内高岭石矿物渐碎片化,单晶尺寸小于全风化土,呈杂乱无章分布。残余节理土的主要矿物类型为赤铁矿和水钠锰矿。初始风化阶段铁锰氧化物胶体呈球状、粒状分布,颗粒孔径主要为数微米至数十微米,表面呈多孔蜂窝状,具有较大的比表面积和胶体活性; 随着风化作用持续,铁锰氧化物胶体颗粒被拉长呈椭球状,沿节理走向呈片状定向挤密排列; 最终形成薄板状定向分层排列,且胶体颗粒的蜂窝状结构逐渐消失,比表面积逐渐降低,圆度降低。残余节理土的饱和渗透系数比两侧全风化土约低两个数量级,节理由风化早期的渗流优先通道逐渐转变为风化后期的隔水夹层,从而影响风化土体内地下水渗流过程,对其边坡稳定性产生不利影响。
The original granite joints are retained in the highly weathered stage and called as relict joints. It is often filled with Fe-Mn oxides, showing a thin interlayer of brown to black, which is significantly different from the surrounding matrix as soil interlayers and has an important impact on slope stability in tropical and humid regions. Soil mineral composition, chemical composition, micro-structure and pore size distribution of granite residual, completely weathered and relict joint soils from a weathered granite slope of Chencun in Rongxian of the southeastern Guangxi were respectively studied by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy spectrum and mercury intrusion analyses; meanwhile, the evolution process of relict joints and the influence on slope stability were discussed. The results show that the main clay mineral compositions of granite residual and completely weathered soils are kaolinite and quartz, and a small amount of illite. The kaolinite in completely weathered soils has a book-shaped structure with a single crystal size of about several microns to tens of microns; the kaolinite in residual soils is fragmented gradually, the single crystal size is smaller and micro-structure is disordered. The main mineral types of relict joint soils are hematite and birnessite. In initial weathering stage, the colloids of Fe-Mn oxides are spherical and granular in shape, the particle pore size is mainly in the range of several microns to tens of microns, and the surface is porous honeycombed with a large specific surface area and colloidal activity; as weathering continues, the colloid particles of Fe-Mn oxides show the ellipsoidal compact arrangement pattern to the patchy and directional arrangement pattern along the joint direction; the honeycomb structure of colloidal particles disappears gradually, and the specific surface of particles decreases gradually, and the roundness also decreases. The saturated permeability coefficient of residual joint soils is about two orders of magnitude lower than that of completely weathered soils on both sides, the joints are preferential flow paths in the early stage of weathering, and gradually transform into low permeability interlayers in highly weathered granite, which affects the percolation process of groundwater in weathered soils, and has adverse effect on slope stability.


[1] AYDIN A.Stability of Saprolitic Slopes:Nature and Role of Field Scale Heterogeneities[J].Natural Hazards and Earth System Sciences,2006,6(1):89-96.
[2] ABAD S A,TUGRUL A,GOKCEOGLU C,et al.Cha-racteristics of Weathering Zones of Granitic Rocks in Malaysia for Geotechnical Engineering Design[J].Engineering Geology,2016,200:94-103.
[3] TALIB Z A,KASSIM A,YUNUSA G H.Influence of Relict Joints on Permeability of Residual Soil[C]∥IOP.IOP Conference Series:Materials Science and Engineering.Bristol:IOP,2016:126-136.
[4] YU X L,LU S G.Micrometer-scale Internal Structure and Element Distribution of Fe-Mn Nodules in Quaternary Red Earth of Eastern China[J].Journal Soils and Sediments,2016,16:621-633.
[5] 鲁安怀,李 艳,丁竑瑞,等.地表“矿物膜”:地球“新圈层”[J].岩石学报,2019,35(1):119-128.
LU An-huai,LI Yan,DING Hong-rui,et al.“Mineral Membrane” of the Surface:“New Sphere” of the Earth[J].Acta Petrologica Sinica,2019,35(1):119-128.
[6] TATING F F,HACK H R,JETTEN V G.Influence of Weathering-induced Iron Precipitation on Properties of Sandstone in a Tropical Environment[J].Quarterly Journal of Engineering Geology and Hydrogeology,2019,52(1):46-60.
[7] ST JOHN B J,SOWERS G F,WEAVER C H.Slickensides in Residual Soils and Their Engineering Signi-ficance[C]∥ICSMFE.Proceedings of 7th International Conference on Soil Mechanics and Foundation Engineering.Mexico City:ICSMFE,1969:591-597.
[8] REGMI A D,YOSHIDA K,DHITAL M R,et al.Wea-thering and Mineralogical Variation in Gneissic Rocks and Their Effect in Sangrumba Landslide,East Nepal[J].Environmental Earth Sciences,2014,71(6):2711-2727.
[9] KOO Y C.Relict Joints in Completely Decomposed Volcanics in Hong Kong[J].Canadian Geotechnical Journal,1982,19(2):117-123.
[10] 孔令伟,罗鸿禧,袁建新.红黏土有效胶结特征的初步研究[J].岩土工程学报,1995,17(5):42-47.
KONG Ling-wei,LUO Hong-xi,YUAN Jian-xin.Preli-minary Study on the Effective Cementation Characteristics of the Red Clay[J].Chinese Journal of Geotechnical Engineering,1995,17(5):42-47.
[11] ZHANG X W,KONG L W,CUI X L,et al.Occurrence Characteristics of Free Iron Oxides in Soil Microstructure:Evidence from XRD,SEM and EDS[J].Bulletin of Engineering Geology and the Environment,2016,75:1493-1503.
[12] 孙银磊,汤连生.化学成分对花岗岩残积土抗拉张力学特性的影响[J].中山大学学报(自然科学版),2018,57(3):7-13.
SUN Yin-lei,TANG Lian-sheng.The Effect of Che-mical Composition on Tensile Mechanics of Residual Granite Soils[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2018,57(3):7-13.
[13] HUANG B F,QIU M,LIN J S,et al.Correlation Between Shear Strength and Soil Physicochemical Pro-perties of Different Weathering Profiles of the Non-eroded and Collapsing Gully Soils in Southern China[J].Journal of Soils and Sediments,2019,19:3832-3846.
[14] LARRAHONDO J M,CHOO H,BURNS S E.Laboratory-prepared Iron Oxide Coatings on Sands:Submicron-scale Small-strain Stiffness[J].Engineering Geo-logy,2011,121(1/2):7-17.
[15] 张先伟,孔令伟.氧化铁胶体与黏土矿物的交互作用及其对黏土土性影响[J].岩土工程学报,2014,36(1):65-74.
ZHANG Xian-wei,KONG Ling-wei.Interaction Between Iron Oxide Colloids and Clay Minerals and Its Effect on Properties of Clay[J].Chinese Journal of Geotechnical Engineering,2014,36(1):65-74.
[16] BOURGAULT R R,RABENHORST M C.Genesis and Characterization of Manganiferous Soils in the Eastern Piedmont,USA[J].Geoderma,2011,165(1):84-94.
[17] GB/T 50123—1999,土工试验方法标准[S].
GB/T 50123—1999,Standard for Soil Test Method[S].
[18] LUO Y,DING J Y,SHEN Y G,et al.Symbiosis Mechanism of Iron and Manganese Oxides in Oxic Aqueous Systems[J].Chemical Geology,2018,488:162-174.
[19] 熊 毅.土壤胶体:第三册,土壤胶体的性质[M].北京:科学出版社,1990.
XIONG Yi.Soil Colloids:III,the Nature of the Soil Coll-oids[M].Beijing:Science Press,1990.
[20] XU X M,DING H R,LI Y,et al.Mineralogical Cha-racteristics of Mn Coatings from Different Weathering Environments in China:Clues on Their Formation[J].Mineralogy and Petrology,2018,112:671-683.
[21] TAZAKI K.Biomineralization of Layer Silicates and Hydrated Fe/Mn Oxides in Microbial Mats:An Electron Microscopical Study[J].Clays and Clay Minerals,1997,45(2):203-212.
[22] SANTOS J C,LE PERA E,SOUZA J,et al.Porosity and Genesis of Clay in Gneiss Saprolites:The Relevance of Saprolithology to Whole Regolith Pedology[J].Geoderma,2018,319:1-13.
[23] 徐则民,黄润秋,唐正光,等.岩体化学风化的非连续性及其科学意义[J].地球科学进展,2006,21(7):706-712.
XU Ze-min,HUANG Run-qiu,TANG Zheng-guang,et al.The Discontinuity of Rock Mass Chemical Weathe-ring and Its Scientific Significance[J].Advances in Earth Science,2006,21(7):706-712.
[24] MOON V,JAYAWARDANE J.Geomechanical and Geo-chemical Changes During Early Stages of Weathering of Karamu Basalt,New Zealand[J].Engineering Geo-logy,2004,74(1/2):57-72.
[25] 王志兵,徐则民.头寨滑坡玄武岩腐岩的岩石化学和矿物学特征[J].矿物学报,2008,28(4):447-454.
WANG Zhi-bing,XU Ze-min.Petrochemistry and Min-eralogy of Basalt Saprolite in Touzhai Landslide[J].Acta Mineralogica Sinica,2008,28(4):447-454.
[26] KRISHNAMURTI G S.Influence of Manganese Oxide Minerals on the Formation of Iron Oxides[J].Clays and Clay Minerals,1988,36(5):467-475.
[27] 蒋建平,章杨松,罗国煜.基于土体中结构面的岩土工程问题探讨[J].工程地质学报,2002,10(2):160-165.
JIANG Jian-ping,ZHANG Yang-song,LUO Guo-yu.Study on Geotechnical Engineering Problem Based on Structural Plane of Soil Mass[J].Journal of Engineering Geology,2002,10(2):160-165.
[28] 刘传正,杨旭东,李荣华,等.广西玉林“6·2”群发型滑坡泥石流灾害[J].中国地质灾害与防治学报,2010,21(2):93.
LIU Chuan-zheng,YANG Xu-dong,LI Rong-hua,et al.Landslide and Debris Flow Hazards of “6·2” Group in Yulin,Guangxi[J].The Chinese Journal of Geological Hazard and Control,2010,21(2):93.
[29] HO K K S,LAU J W C.Learning from Slope Failures to Enhance Landslide Risk Management[J].Quarterly Journal of Engineering Geology and Hydrogeology,2010,43(1):33-68.



收稿日期:2019-10-21; 修回日期:2020-03-06; 网络首发日期:2020-04-10投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(41302227,51768015); 广西自然科学基金项目(2017GXNSFAA198092)
更新日期/Last Update: 2020-05-27