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Microstructural, Chemical and Mineralogical Analyses for Understanding the Geotechnical Properties of clayey soils

Journal of Minerals and Materials Characterization and Engineering 2016年第6期4卷 305-319页

作者： Yvette Tankpinou Kiki Nadia Saiyouri Victor Gbaguidi Yannick Anguy Cécile Gaborieau Richard Fabre Institut de Mécanique et d’ Ingénierie (I2M) Université de Bordeaux Talence Cedex France Laboratoire d’ Energétique et de Mécanique Appliquée Université d’Abomey-Calavi Cotonou Bénin

This paper presents a study research in the laboratory of three clayey soils from the depression of the Lama, a tropical climate area where disorders appear on construction and roads. Samples were tested to establish the relationship between their mineralogy and their geotechnical properties. On the three clayey soils, analyses were performed to characterize the macroscopic behavior (physical tests, free swelling test and compressibility tests) and the microstructural, chemical and mineralogical characterizations by thermal analysis, chemical analysis, X-Ray diffraction, Scanning Electron Microscopy observations complementary X-ray EDS analyses. At first glance, the results of physical and compressibility tests appear not to be consistent with the free swelling test results. Indeed, these results highlighted differences in the behaviors of the samples because the swelling potential revealed by the results of physical and compressibility test does not follow the same trend as the one given by the free swelling test result. The main clay minerals in the studied clayey soils varied from fibrous clays (palygorskite) to best-known clays such as smectite and kaolinite. Microstructural, chemical and mineralogical analyses allowed to understand and explain the different trends obtained by the different types of geotechnical characterization tests of studied clayey soils.

关键词： Geotechnical Mineralogical Microstructural Free Swelling Index Smectite Palygorskite clayey soils

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On Physical and Mechanical Behavior of Natural Marine Intermediate Deposits

引用

China Ocean Engineering 2005年第1期19卷 111-119页

作者：石名磊邓学钧 Transportation College Southeast University Nanjing 210096 China

Coastal structures may be built on natural sedimentary intermediate grounds, which mainly consist of silty soils and fine sandy soils. In this study, extensive field and laboratory tests were performed on the natural marine intermediate deposits to demonstrate the difference in behavior between natural marine clayey soils and natural marine intermediate deposits. The natural intermediate deposits have almost the same ratios of natural water content to liquid limit as those of the soft natural marine clays, but the former have much higher in-situ strength and sensitivity than the latter. The research results indicate that grain size distributions of soils affect significantly tip resistance obtained in field cone penetration tests. The mechanical parameters of natural marine intermediate deposits are also significantly affected by sample disturbance due to their high sensitivity and relatively large permeability. Unconfined compression shear tests largely underestimate the strength of natural marine intermediate soils. The triaxial consolidated compression shear tests with simulated in-situ confined pressure give results much better than those of uncomfined compression shear tests.

关键词： clayey soils filed tip resistance grain size distributions liquid limit natural marine intermediate deposits natural water content laboratory strength

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