| 陕北晋西砂黄土的胶结物与胶结作用研究 |
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| 引用本文： | 张永双,曲永新.陕北晋西砂黄土的胶结物与胶结作用研究[J].工程地质学报(英文版),2005,13(1):18-28. |
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| 作者姓名： | 张永双 曲永新 |
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| 作者单位： | 中国地质科学院地质力学研究所,北京,100081;中国科学院地质与地球物理研究所,北京,100029 |
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| 摘 要： | 在野外调查的基础上,采用SEM、XRD、土壤物理和土壤化学等方法,对陕北晋西12个县市的48个马兰黄土样品进 行了全分散法粒度组成测定、聚集体分析以及黄土胶结物组成的测试分析。结果表明,砂黄土中的粘土矿物和超细碳酸盐、 游离氧化物和有机质等胶结物质主要是以聚集体包膜的形式存在于碎屑颗粒表面,并构成砂黄土骨架间的结构联结,具有弱 胶结特性。砂黄土中粘土矿物和有机质为非水稳性胶结物质,仅在干燥状态具有较弱的胶结作用;黄土中的CaCO3呈粗颗粒 骨架和细分散超细碳酸钙两种形式存在,并分别起着骨架作用和胶结作用,超细碳酸钙为不可逆的胶结材料,在聚集体形成、 保存以及聚集体与碎屑颗粒之间的联结方面发挥着重要作用;非晶质游离氧化物(SiO2、Fe2O3、Al2O3)含量虽低,但由于他们 是以薄膜形式分布在颗粒表面,在黄土胶结作用中也是不可忽视的,并与上述各种胶结物共同起作用。通过统计分析认为, 凝聚系数可以较好地反映黄土的胶结程度,成为联系黄土胶结特性与黄土物理力学性质之间的桥梁。黄土胶结物组成及其 胶结机理的研究不仅有助于深化砂黄土工程特性的认识,而且对揭示黄土高原表生地球化学环境具有重要意义。
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| 关 键 词： | 砂黄土 胶结物 胶结作用 粘土矿物 聚集体 超细碳酸钙 |
| 文章编号： | 1004-9665/2005/13(01)-0018-11 |
| 收稿时间： | 2004-08-05 |
| 修稿时间： | 2004年8月5日 |
CEMENTS OF SAND LOESS AND THEIR CEMENTATION IN NORTH SHAANXI AND WEST SHANXI |
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| ZHANG Yongshuang,QU Yongxin.CEMENTS OF SAND LOESS AND THEIR CEMENTATION IN NORTH SHAANXI AND WEST SHANXI[J].Journal of Engineering Geology,2005,13(1):18-28. |
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| Authors: | ZHANG Yongshuang QU Yongxin |
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| Institution: | 1.Institute of Geomechanics, Chinese Academy of Geological Sciences,Beijing 100081;2.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Based on field investigation, using multiple methods including SEM, XRD, as well as soil physics and soil chemistry methods, the particle composition, aggregate, and cement composition were measured on 48 samples of Malan loess from 12 counties of north Shaanxi province and west Shanxi province. The test results indicate that the cements, including clay minerals, super fine-grained carbonate, free oxides, and organic materials, mainly exist as a aggregate coat on the grain surface, and form weak cementation between the frameworks of sand loess. The clay minerals and organic materials in sand loess have weak cementation only in dry state because it is not stable in water. Calcium carbonates (CaCO 3) in sand loess exist as both coarse grains and fine grains, forming the framework and cementation. The super fine grain is a kind of irreversible cementing material, which plays an important role in the course of aggregate formation, preservation, as well as connection between aggregates and debris grains. The contents of amorphous oxides (SiO 2、Fe 2O 3、Al 2O 3) are low, but they should not be ignored in the cementation of sand loess because of their interaction with other cements on the grain surface. Based on the statistic analysis, the aggregation coefficient can reflect the cementation degree of sand loess, which establishes a bridge (strong relationship) between cementation and physical-mechanical properties of loess. The study of cement composition and their cementation mechanisms not only helps us to have a better understating of the engineering properties of sand loess, but also provides a better insight into the supergene geochemical environment of loess plateau of China. |
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| Keywords: | Sand loess Cement Cementation Clay mineral Aggregate Super fine-grained calcium carbonate |
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