Full-flow cyclic degradation and micro-structure of representative deep-sea soft clay
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摘要: 深海软黏土具有不同于陆相或近海软黏土的岩土工程性质。针对取自中国南海西部深水区5个典型站位的海床软黏土,采用一种改进的全流动贯入装置对其强度特征进行测试,并结合深海软黏土特殊的微观结构和生物硅矿物,对其循环软化特性进行分析和探讨。研究结果表明：南海西部深海软黏土普遍具有高含水率、高液性指数、高活性值、低不排水抗剪强度和高灵敏度等特点,极慢的沉积速率和稳定的沉积环境是深海软黏土具有高灵敏度的主要原因。全流动循环软化过程中土体结构的变化主要体现在絮凝体的破坏和孔隙结构的改变两个方面。特殊的生物硅颗粒在循环作用下会发生破碎,导致内部孔隙水释放,从而加剧了土体循环软化的程度。Abstract: The geotechnical properties of deep-sea soft clay are quite different from those of terrestrial or offshore clay. For the representative deep-sea soft clay collected from the western region of South China Sea, an improved full-flow penetration device is used to measure its strength characteristics. Combined with (Focusing on) the special micro-structure and bio-silica minerals, the cyclic degradation characteristics are analyzed and discussed. The results show that the deep-sea soft clay in the western region of South China Sea generally has the characteristics of high water content, high liquidity index, high activity, low undrained shear strength and high sensitivity. The extremely slow deposition rate and stable deposition environment are the main reasons for the high sensitivity of deep-sea soft clay. The change of micro-structure of soils during the full-flow cyclic degradation process is mainly caused by the damage of flocculation and the change of pore structure. The bio-silica particles may break under the cyclic penetration, leading to the release of the internal pore water, which will aggravate the degree of degradation.
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