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Origin,physical, and mineralogical nature of red clays: The Pacific Ocean Basin as a model 总被引：2，自引：0，他引：2
Extensive examination of North Pacific Basin red clays by scanning and transmission electron microscopy reveals that the mean constituent of the red clays are illite-rich argillaceous or shale clasts, quartz and authigenic smectite. The main source of the shale clasts and quartz are aeolian in nature and are derived mainly from African and Asian shales. Illite-rich argillaceous or shale clasts are identifiable by their morphology (high degree of roundness), selected area diffraction, and their unique fracture characteristics created by an ultra thin-sectioning process. This allows for the identification and differentiation of illite-rich shale clasts from other clays, including detrital illite, kaolinite, and smectite. Geotechnical examination of the red clays indicate that they are overconsolidated: the preconsolidation stress is in all cases larger than the vertical effective stress. The overconsolidation is attributed to the strong bonding of argillaceous or shale clasts, quartz and other particulate matter by x-ray amorphous and well developed crystalline sheets of authigenic smectite characterized by high surface activity. 相似文献
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The concept of base isolation for storage racks is still a developing subject and has not been addressed in the recently updated seismic codes for storage racks. The friction pendulum bearing system(FPS) generates a natural period independent of the structure’s seismic mass. This property makes FPS an ideal choice for isolating rack structures since merchandise may be placed on the racks in several possible arrangements. The results of a comprehensive parametric study aimed at evaluating the sei... 相似文献
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