三峡库区泥灰质岩石及其残坡积土化学成分及粘土矿物的定量研究

A Quantitative Research on the Chemical Composition and Clay Minerals in Marly Stones and Their Residuals in the Three Gorges Reservoir Region

由于三峡库区三叠系巴东组 (T2 b)泥灰质岩石特殊的化学矿物组成和所处亚热带湿热环境 ,决定了三峡库区移民迁建场地工程地质环境的复杂性。通过泥灰质岩石及其不同风化岩和残坡积土的化学成分、粘土矿物成分定量研究和扫描电镜观察 ,揭示了 Ca CO3溶蚀和粘土矿物富集过程及粘土矿物的复杂成分 ,发现了风化过程中伊利石 (I)向伊利石 /蒙脱石 (I/ S)混层粘土矿物的转化 ,解释了岩土工程性质恶化的原因 ,从而提高了地质研究和地质灾害研究的水平。

The special chemical and mineral compositions of marly stones of the Triassic Badong Formation (T 2b) and the moist-hot subtropic environment have resulted in the complexity of engineering geological environment of the resettlement site in the Three Gorges Reservoir region. With a quantitative research on the chemical and clay compositions of marly stones, their weathering rocks and residuals, as well as SEM observations, the process of dissolution of CaCO 3 and concentration of clay minerals with complex components has been disclosed, and the conversion of illite (I) to mixed-layer illite/montmorillonite (I/S) discovered, which explain the reason for deterioration of geotechnical properties of the rocks and soils, thereby enhancing the level of geological and geohazards researches.