【摘要】 为舟山潮差带海相沉积物固结机理的深入研究提供物质基础,采用激光粒度仪分析了海相沉积物的粒度组成,并测试了海相沉积物的化学元素、化合物种类及其相对含量,还使用X-射线衍射技术分析了海相沉物的矿物组成。结果表明:海相沉积物含水率高、初始孔隙比大、呈流塑状,为低液限粉质黏土;活性指数为12.4,属于活动黏性土,矿物的亲水性较好;全盐含量高达9～11.2 g/kg,阳离子交换能力不强,有机质含量（5.82～12.7 g/kg）较高;pH值为7.35～8.36,呈弱碱性,加上孔隙水中K⁺,Na⁺,Ca²⁺,Mg²⁺的存在,使得高岭石常不稳定,有向伊利石、蒙脱石或绿泥石转化的趋势。更多还原

【Abstract】 To provide material basis for the further study of consolidation mechanism of marine sediment in the tidal zone of Zhoushan, the particle composition of marine sediments is analyzed by laser particle size analyzer, the chemical elements, compound species and their relative contents of marine sediments are tested, and the mineral composition of marine sediments was also analyzed using X-ray diffraction techniques. The results indicate that the marine sediment is mainly composed of low liquid limit silty clay, which is high in water content rate, large in initial pore ratio and flow plastic in property. The activity index of the sediment is 12.4, indicating that it belongs to an active clay. The minerals in the sediment have a good hydrophilicity. The total salt content of the sediment is as high as 9～11.2 g/kg. The cation exchange capacity of the sediment is not strong and the organic matter content of the sediment is high（5.82～12.7 g/kg）. The pH of the sediment is 7.35～8.36, showing weakly alkaline in property. The pore water of the sediment contains K⁺, Na⁺, Ca²⁺ and Mg²⁺, which makes kaolinite unstable and tend to transform into illite, montmorillonite or chlorite.更多还原