舟山潮差带海相沉积物的物理和化学特征  

Physical and Chemical Characteristics of Marine Sediments in the Offshore of Zhoushan

作　　者：熊站 汪明元 单治钢 严乾 王亚军 李涛 XIONG Zhan;WANG Ming-yuan;SHAN Zhi-gang;YAN Qian;WANG Ya-jun;LI Tao(School of Port and Transportation Engineering, Zhejiang Ocean University , Zhoushan 316022, China;Huadong Engineering Corporation Limited , China Power, Hangzhou 311112, China)

机构地区：[1]浙江海洋大学港航与交通运输工程学院,浙江舟山316022 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《海岸工程》2019年第1期71-76,共6页Coastal Engineering

基　　金：国家自然科学基金项目--基于模糊随机损伤力学的混凝土高坝抗震安全评价研究项目(51109118);清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2018-E-03);浙江省自然科学基金项目--堤坝及基岩系统多相-多场耦合非线性动力损伤灾变理论与数值方法研究(LY14E090001);中国电建集团华东水利水电勘测设计研究院基础研究课题--围海造路工程中大规模吹填泥浆快速排水固结技术的模型试验与研究(21188006615)

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^+,Ca^(2+),Mg^(2+)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。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^+, Ca^2+ and Mg^2+, which makes kaolinite unstable and tend to transform into illite, montmorillonite or chlorite.

关 键 词：海相沉积物 粒度组成 化学性质 矿物组成 

分 类 号：P736.211[天文地球—海洋地质] P642.11[天文地球—海洋科学]